TY  - JOUR
AU  - Terzić, Anja
AU  - Obradović, Nina
AU  - Kosanović, Darko
AU  - Stojanović, Jovica
AU  - Đorđević, Antonije
AU  - Andrić, Ljubiša
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884218329262
UR  - https://dais.sanu.ac.rs/123456789/4635
AB  - Steatite, as ceramic with composition predominantly resting on magnesium silicate, was produced from economic resources – talc, aluminosilicate clays, and either BaCO3 or feldspar as flux. Titanium dioxide was a doping agent. Four steatite mixtures were mechanically activated in a planetary ball mill for 30, 45 or 60 min, prior to the thermal treatment. Two-step sintering with initial phase set at 1350 °C and holding period conducted at 1250 °C was applied to initiate diffusion and prevent grain growth. Thereby, a high density ceramic material with low-porous submicron structure was acquired. The effects of TiO2 addition on densification, microstructure, and dielectric characteristics of steatites were monitored. The thermal stability of green mixtures was tested by differential thermal and thermogravimetric analyses. Changes in crystallinity and mineral phase composition were observed by the X-ray diffraction technique. Microstructural visualization with spatial arrangements of individual chemical elements on surface of the sintered ceramics was acquired by scanning electron microscopy accompanied with EDS mapping. In order to test the possibility of employment of the obtained steatites in insulation materials, electrical measurements were conducted by recording variations of the dielectric constant and loss tangent as a function of alternations in the mix-design and the mechanical activation period.
PB  - Elsevier
T2  - Ceramics International
T1  - Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics
SP  - 3013
EP  - 3022
VL  - 45
IS  - 3
DO  - 10.1016/j.ceramint.2018.10.120
UR  - https://hdl.handle.net/21.15107/rcub_dais_4635
ER  - 

@article{
author = "Terzić, Anja and Obradović, Nina and Kosanović, Darko and Stojanović, Jovica and Đorđević, Antonije and Andrić, Ljubiša and Pavlović, Vladimir B.",
year = "2019",
abstract = "Steatite, as ceramic with composition predominantly resting on magnesium silicate, was produced from economic resources – talc, aluminosilicate clays, and either BaCO3 or feldspar as flux. Titanium dioxide was a doping agent. Four steatite mixtures were mechanically activated in a planetary ball mill for 30, 45 or 60 min, prior to the thermal treatment. Two-step sintering with initial phase set at 1350 °C and holding period conducted at 1250 °C was applied to initiate diffusion and prevent grain growth. Thereby, a high density ceramic material with low-porous submicron structure was acquired. The effects of TiO2 addition on densification, microstructure, and dielectric characteristics of steatites were monitored. The thermal stability of green mixtures was tested by differential thermal and thermogravimetric analyses. Changes in crystallinity and mineral phase composition were observed by the X-ray diffraction technique. Microstructural visualization with spatial arrangements of individual chemical elements on surface of the sintered ceramics was acquired by scanning electron microscopy accompanied with EDS mapping. In order to test the possibility of employment of the obtained steatites in insulation materials, electrical measurements were conducted by recording variations of the dielectric constant and loss tangent as a function of alternations in the mix-design and the mechanical activation period.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics",
pages = "3013-3022",
volume = "45",
number = "3",
doi = "10.1016/j.ceramint.2018.10.120",
url = "https://hdl.handle.net/21.15107/rcub_dais_4635"
}

Terzić, A., Obradović, N., Kosanović, D., Stojanović, J., Đorđević, A., Andrić, L.,& Pavlović, V. B.. (2019). Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics. in Ceramics International
Elsevier., 45(3), 3013-3022.
https://doi.org/10.1016/j.ceramint.2018.10.120
https://hdl.handle.net/21.15107/rcub_dais_4635

Terzić A, Obradović N, Kosanović D, Stojanović J, Đorđević A, Andrić L, Pavlović VB. Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics. in Ceramics International. 2019;45(3):3013-3022.
doi:10.1016/j.ceramint.2018.10.120
https://hdl.handle.net/21.15107/rcub_dais_4635 .

Terzić, Anja, Obradović, Nina, Kosanović, Darko, Stojanović, Jovica, Đorđević, Antonije, Andrić, Ljubiša, Pavlović, Vladimir B., "Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics" in Ceramics International, 45, no. 3 (2019):3013-3022,
https://doi.org/10.1016/j.ceramint.2018.10.120 .,
https://hdl.handle.net/21.15107/rcub_dais_4635 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Obradović, Nina
AU  - Kosanović, Darko
AU  - Stojanović, Jovica
AU  - Đorđević, Antonije
AU  - Andrić, Ljubiša
AU  - Pavlović, Vladimir B.
PY  - 2019
UR  - http://www.sciencedirect.com/science/article/pii/S0272884218329262
UR  - https://dais.sanu.ac.rs/123456789/4645
AB  - Steatite, as ceramic with composition predominantly resting on magnesium silicate, was produced from economic resources – talc, aluminosilicate clays, and either BaCO3 or feldspar as flux. Titanium dioxide was a doping agent. Four steatite mixtures were mechanically activated in a planetary ball mill for 30, 45 or 60 min, prior to the thermal treatment. Two-step sintering with initial phase set at 1350 °C and holding period conducted at 1250 °C was applied to initiate diffusion and prevent grain growth. Thereby, a high density ceramic material with low-porous submicron structure was acquired. The effects of TiO2 addition on densification, microstructure, and dielectric characteristics of steatites were monitored. The thermal stability of green mixtures was tested by differential thermal and thermogravimetric analyses. Changes in crystallinity and mineral phase composition were observed by the X-ray diffraction technique. Microstructural visualization with spatial arrangements of individual chemical elements on surface of the sintered ceramics was acquired by scanning electron microscopy accompanied with EDS mapping. In order to test the possibility of employment of the obtained steatites in insulation materials, electrical measurements were conducted by recording variations of the dielectric constant and loss tangent as a function of alternations in the mix-design and the mechanical activation period.
PB  - Elsevier
T2  - Ceramics International
T1  - Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics
SP  - 3013
EP  - 3022
VL  - 45
IS  - 3
DO  - 10.1016/j.ceramint.2018.10.120
UR  - https://hdl.handle.net/21.15107/rcub_dais_4645
ER  - 

@article{
author = "Terzić, Anja and Obradović, Nina and Kosanović, Darko and Stojanović, Jovica and Đorđević, Antonije and Andrić, Ljubiša and Pavlović, Vladimir B.",
year = "2019",
abstract = "Steatite, as ceramic with composition predominantly resting on magnesium silicate, was produced from economic resources – talc, aluminosilicate clays, and either BaCO3 or feldspar as flux. Titanium dioxide was a doping agent. Four steatite mixtures were mechanically activated in a planetary ball mill for 30, 45 or 60 min, prior to the thermal treatment. Two-step sintering with initial phase set at 1350 °C and holding period conducted at 1250 °C was applied to initiate diffusion and prevent grain growth. Thereby, a high density ceramic material with low-porous submicron structure was acquired. The effects of TiO2 addition on densification, microstructure, and dielectric characteristics of steatites were monitored. The thermal stability of green mixtures was tested by differential thermal and thermogravimetric analyses. Changes in crystallinity and mineral phase composition were observed by the X-ray diffraction technique. Microstructural visualization with spatial arrangements of individual chemical elements on surface of the sintered ceramics was acquired by scanning electron microscopy accompanied with EDS mapping. In order to test the possibility of employment of the obtained steatites in insulation materials, electrical measurements were conducted by recording variations of the dielectric constant and loss tangent as a function of alternations in the mix-design and the mechanical activation period.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics",
pages = "3013-3022",
volume = "45",
number = "3",
doi = "10.1016/j.ceramint.2018.10.120",
url = "https://hdl.handle.net/21.15107/rcub_dais_4645"
}

Terzić, A., Obradović, N., Kosanović, D., Stojanović, J., Đorđević, A., Andrić, L.,& Pavlović, V. B.. (2019). Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics. in Ceramics International
Elsevier., 45(3), 3013-3022.
https://doi.org/10.1016/j.ceramint.2018.10.120
https://hdl.handle.net/21.15107/rcub_dais_4645

Terzić A, Obradović N, Kosanović D, Stojanović J, Đorđević A, Andrić L, Pavlović VB. Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics. in Ceramics International. 2019;45(3):3013-3022.
doi:10.1016/j.ceramint.2018.10.120
https://hdl.handle.net/21.15107/rcub_dais_4645 .

Terzić, Anja, Obradović, Nina, Kosanović, Darko, Stojanović, Jovica, Đorđević, Antonije, Andrić, Ljubiša, Pavlović, Vladimir B., "Effects of mechanical-activation and TiO2 addition on the behavior of two-step sintered steatite ceramics" in Ceramics International, 45, no. 3 (2019):3013-3022,
https://doi.org/10.1016/j.ceramint.2018.10.120 .,
https://hdl.handle.net/21.15107/rcub_dais_4645 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Obradović, Nina
AU  - Pouchly, Vaclav
AU  - Stojanović, Jovica
AU  - Maca, Karel
AU  - Pavlović, Vladimir B.
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/4536
AB  - The influence of the sintering method on the mineral phase transformations and development of the crystalline microstructure of steatite ceramics was investigated. The steatite samples were fabricated from talc and bentonite as low-cost raw materials. Feldspar and barium carbonate, as fluxing agents, were altered in the steatite composition. Dilatometric analysis was applied in the monitoring of the dimensional changes and thereby densification of steatite during the traditional sintering (TS) procedure up to 1200°C. Spark plasma sintering (SPS) method was used under the following sintering conditions: 100°C/min heating rate, uniaxial pressure of 50 MPa; sintering temperature 800°C/1 min or 1000°C/2 min. Crystallinity changes and mineral phase transition during sintering were observed by X-ray diffraction technique. Microstructural visualization of the samples and the spatial arrangements of individual chemical elements were achieved via scanning electron microscopy equipped with the EDS mapping. It was found that SPS sintering facilitated all microstructural changes during high temperature treatment and shifted them to lower temperatures. SPS treatment conducted at 1000°C resulted in maximum densification of the steatite powder compacts and the formation stabilized protoenstatite structure. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. ON 172057 and Grant no. III 45008]
PB  - Belgrade : ETRAN
T2  - Science of Sintering
T1  - Microstructure and phase composition of steatite ceramics sintered by traditional and spark plasma sintering
SP  - 299
EP  - 312
VL  - 50
IS  - 3
DO  - 10.2298/SOS1803299T
UR  - https://hdl.handle.net/21.15107/rcub_dais_4536
ER  - 

@article{
author = "Terzić, Anja and Obradović, Nina and Pouchly, Vaclav and Stojanović, Jovica and Maca, Karel and Pavlović, Vladimir B.",
year = "2018",
abstract = "The influence of the sintering method on the mineral phase transformations and development of the crystalline microstructure of steatite ceramics was investigated. The steatite samples were fabricated from talc and bentonite as low-cost raw materials. Feldspar and barium carbonate, as fluxing agents, were altered in the steatite composition. Dilatometric analysis was applied in the monitoring of the dimensional changes and thereby densification of steatite during the traditional sintering (TS) procedure up to 1200°C. Spark plasma sintering (SPS) method was used under the following sintering conditions: 100°C/min heating rate, uniaxial pressure of 50 MPa; sintering temperature 800°C/1 min or 1000°C/2 min. Crystallinity changes and mineral phase transition during sintering were observed by X-ray diffraction technique. Microstructural visualization of the samples and the spatial arrangements of individual chemical elements were achieved via scanning electron microscopy equipped with the EDS mapping. It was found that SPS sintering facilitated all microstructural changes during high temperature treatment and shifted them to lower temperatures. SPS treatment conducted at 1000°C resulted in maximum densification of the steatite powder compacts and the formation stabilized protoenstatite structure. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. ON 172057 and Grant no. III 45008]",
publisher = "Belgrade : ETRAN",
journal = "Science of Sintering",
title = "Microstructure and phase composition of steatite ceramics sintered by traditional and spark plasma sintering",
pages = "299-312",
volume = "50",
number = "3",
doi = "10.2298/SOS1803299T",
url = "https://hdl.handle.net/21.15107/rcub_dais_4536"
}

Terzić, A., Obradović, N., Pouchly, V., Stojanović, J., Maca, K.,& Pavlović, V. B.. (2018). Microstructure and phase composition of steatite ceramics sintered by traditional and spark plasma sintering. in Science of Sintering
Belgrade : ETRAN., 50(3), 299-312.
https://doi.org/10.2298/SOS1803299T
https://hdl.handle.net/21.15107/rcub_dais_4536

Terzić A, Obradović N, Pouchly V, Stojanović J, Maca K, Pavlović VB. Microstructure and phase composition of steatite ceramics sintered by traditional and spark plasma sintering. in Science of Sintering. 2018;50(3):299-312.
doi:10.2298/SOS1803299T
https://hdl.handle.net/21.15107/rcub_dais_4536 .

Terzić, Anja, Obradović, Nina, Pouchly, Vaclav, Stojanović, Jovica, Maca, Karel, Pavlović, Vladimir B., "Microstructure and phase composition of steatite ceramics sintered by traditional and spark plasma sintering" in Science of Sintering, 50, no. 3 (2018):299-312,
https://doi.org/10.2298/SOS1803299T .,
https://hdl.handle.net/21.15107/rcub_dais_4536 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Đorđević, Nataša
AU  - Mitrić, Miodrag
AU  - Marković, Smilja
AU  - Đorđević, Katarina
AU  - Pavlović, Vladimir B.
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/2393
AB  - Due to pozzolanic characteristics, fly ash is commonly used as a cement replacement in construction composites. Addition of natural clays with sorption ability (i.e. zeolite and bentonite) in to the fly ash based construction materials is of both scientific and industrial interest. Namely, due to the application of sorptive clay minerals, it is possible to immobilize toxic heavy metals from the composite structure. The thermal compatibility of fly ash and zeolite, as well as fly ash and bentonite, within the composite was observed during sintering procedure. The starting components were used in 1:1 ratio and they were applied without additional mechanical treatment. The used compaction pressure for the tablets was 2 t•cm-2. The sintering process was conducted at 1000ºC and 1200ºC for two hours in the air atmosphere. The mineralogical phase composition of the non-treated and sintered samples was analyzed using X-ray diffraction method. Scanning electron microscopy was applied in the analysis of the microstructure of starting and sintered samples. The thermal behavior was observed via DTA method. The influence of temperature on the properties of fly ash-zeolite and fly ash-bentonite composites was investigated
PB  - International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Sintering of fly ash based composites with zeolite and bentonite addition for application in construction materials
SP  - 23
EP  - 37
VL  - 49
IS  - 1
DO  - 10.2298/SOS1701023T
UR  - https://hdl.handle.net/21.15107/rcub_dais_2393
ER  - 

@article{
author = "Terzić, Anja and Đorđević, Nataša and Mitrić, Miodrag and Marković, Smilja and Đorđević, Katarina and Pavlović, Vladimir B.",
year = "2017",
abstract = "Due to pozzolanic characteristics, fly ash is commonly used as a cement replacement in construction composites. Addition of natural clays with sorption ability (i.e. zeolite and bentonite) in to the fly ash based construction materials is of both scientific and industrial interest. Namely, due to the application of sorptive clay minerals, it is possible to immobilize toxic heavy metals from the composite structure. The thermal compatibility of fly ash and zeolite, as well as fly ash and bentonite, within the composite was observed during sintering procedure. The starting components were used in 1:1 ratio and they were applied without additional mechanical treatment. The used compaction pressure for the tablets was 2 t•cm-2. The sintering process was conducted at 1000ºC and 1200ºC for two hours in the air atmosphere. The mineralogical phase composition of the non-treated and sintered samples was analyzed using X-ray diffraction method. Scanning electron microscopy was applied in the analysis of the microstructure of starting and sintered samples. The thermal behavior was observed via DTA method. The influence of temperature on the properties of fly ash-zeolite and fly ash-bentonite composites was investigated",
publisher = "International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Sintering of fly ash based composites with zeolite and bentonite addition for application in construction materials",
pages = "23-37",
volume = "49",
number = "1",
doi = "10.2298/SOS1701023T",
url = "https://hdl.handle.net/21.15107/rcub_dais_2393"
}

Terzić, A., Đorđević, N., Mitrić, M., Marković, S., Đorđević, K.,& Pavlović, V. B.. (2017). Sintering of fly ash based composites with zeolite and bentonite addition for application in construction materials. in Science of Sintering
International Institute for the Science of Sintering., 49(1), 23-37.
https://doi.org/10.2298/SOS1701023T
https://hdl.handle.net/21.15107/rcub_dais_2393

Terzić A, Đorđević N, Mitrić M, Marković S, Đorđević K, Pavlović VB. Sintering of fly ash based composites with zeolite and bentonite addition for application in construction materials. in Science of Sintering. 2017;49(1):23-37.
doi:10.2298/SOS1701023T
https://hdl.handle.net/21.15107/rcub_dais_2393 .

Terzić, Anja, Đorđević, Nataša, Mitrić, Miodrag, Marković, Smilja, Đorđević, Katarina, Pavlović, Vladimir B., "Sintering of fly ash based composites with zeolite and bentonite addition for application in construction materials" in Science of Sintering, 49, no. 1 (2017):23-37,
https://doi.org/10.2298/SOS1701023T .,
https://hdl.handle.net/21.15107/rcub_dais_2393 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Obradović, Nina
AU  - Stojanović, Jovica
AU  - Pavlović, Vladimir B.
AU  - Andrić, Ljubiša
AU  - Olćan, Dragan
AU  - Đorđević, Antonije
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/2356
AB  - The focus of the study was on providing insights into interconnections between sintering and development of the crystalline microstructure, and consequently variations in dielectric behavior of four steatites fabricated from a low-cost raw material, i.e. talc. The changes, induced by the alternations of the binders (bentonite, kaolin clay) and fluxing agents (BaCO3, feldspar), were monitored in the temperature range 1000° to 1250 °C in which complete densification and re-crystallization of the investigated structures were accomplished. The critical points in the synthesis of steatite materials were assessed by instrumental analyses. Crystallinity changes and mineral phase transition during sintering were monitored by X-ray diffraction technique. Microstructural visualization of the samples and the spatial arrangements of individual chemical elements were achieved via scanning electron microscopy accompanied with EDS mapping. The thermal stability was observed on the green mixtures using differential thermal and thermo gravimetric analyses. Electrical measurements recorded variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of the sintering temperature. The investigation highlighted critical design points, as well as the optimal combinations of the raw materials for production of the steatite ceramics for advanced electrical engineering applications.
PB  - Elsevier
T2  - Ceramics International
T1  - Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials
SP  - 13264
EP  - 13275
VL  - 43
IS  - 16
DO  - 10.1016/j.ceramint.2017.07.024
UR  - https://hdl.handle.net/21.15107/rcub_dais_2356
ER  - 

@article{
author = "Terzić, Anja and Obradović, Nina and Stojanović, Jovica and Pavlović, Vladimir B. and Andrić, Ljubiša and Olćan, Dragan and Đorđević, Antonije",
year = "2017",
abstract = "The focus of the study was on providing insights into interconnections between sintering and development of the crystalline microstructure, and consequently variations in dielectric behavior of four steatites fabricated from a low-cost raw material, i.e. talc. The changes, induced by the alternations of the binders (bentonite, kaolin clay) and fluxing agents (BaCO3, feldspar), were monitored in the temperature range 1000° to 1250 °C in which complete densification and re-crystallization of the investigated structures were accomplished. The critical points in the synthesis of steatite materials were assessed by instrumental analyses. Crystallinity changes and mineral phase transition during sintering were monitored by X-ray diffraction technique. Microstructural visualization of the samples and the spatial arrangements of individual chemical elements were achieved via scanning electron microscopy accompanied with EDS mapping. The thermal stability was observed on the green mixtures using differential thermal and thermo gravimetric analyses. Electrical measurements recorded variations of the dielectric constant (εr) and loss tangent (tan δ) as a function of the sintering temperature. The investigation highlighted critical design points, as well as the optimal combinations of the raw materials for production of the steatite ceramics for advanced electrical engineering applications.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials",
pages = "13264-13275",
volume = "43",
number = "16",
doi = "10.1016/j.ceramint.2017.07.024",
url = "https://hdl.handle.net/21.15107/rcub_dais_2356"
}

Terzić, A., Obradović, N., Stojanović, J., Pavlović, V. B., Andrić, L., Olćan, D.,& Đorđević, A.. (2017). Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials. in Ceramics International
Elsevier., 43(16), 13264-13275.
https://doi.org/10.1016/j.ceramint.2017.07.024
https://hdl.handle.net/21.15107/rcub_dais_2356

Terzić A, Obradović N, Stojanović J, Pavlović VB, Andrić L, Olćan D, Đorđević A. Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials. in Ceramics International. 2017;43(16):13264-13275.
doi:10.1016/j.ceramint.2017.07.024
https://hdl.handle.net/21.15107/rcub_dais_2356 .

Terzić, Anja, Obradović, Nina, Stojanović, Jovica, Pavlović, Vladimir B., Andrić, Ljubiša, Olćan, Dragan, Đorđević, Antonije, "Influence of different bonding and fluxing agents on the sintering behavior and dielectric properties of steatite ceramic materials" in Ceramics International, 43, no. 16 (2017):13264-13275,
https://doi.org/10.1016/j.ceramint.2017.07.024 .,
https://hdl.handle.net/21.15107/rcub_dais_2356 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Pezo, Lato
AU  - Andrić, Ljubiša
AU  - Pavlović, Vladimir B.
AU  - Mitić, Vojislav V.
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/2350
AB  - The properties of seven montmorillonite-rich bentonites of different geological origin were investigated prior and subsequent to mechano-chemical processing in an ultra-centrifugal mill. The objective of the experiment was altering the bentonite types and activation parameters in order to determine the optimal milling conditions that produce material which is physico-mechanically and microstructurally applicable as a binder replacement and sorbent in the construction composites. The efficiency of bentonite activation was assessed by chemometrics and Artificial neural networks mathematical modeling. Principal component analysis and analysis of variance were used in the observation of the influence of input variables (bentonite chemical composition) and process parameters (milling duration, rotor velocity) on the product characteristics: density, specific surface area, grain size and distribution, cation exchange capacity, melting point, compressive strength, shrinkage and porosity. When the ANN models for the observed responses, related to predicted bentonite characteristics and quality, were compared to experimental results, they correctly predicted the responses. The processed data also adequately fitted to the regression second order polynomial models. The SOP models, which showed r2 values from 0.357 to 0.948, and were able to predict the observed responses in a wide range of processing parameters, while ANN models performed high prediction accuracy (0.776–0.901) and can be considered as precise for response variables prediction. The combination of the conducted mathematical analyses showed that that increase/decrease in output values was stabilized after 30 min of activation. Mathematically attained interpretations were correlated with the results of the instrumental analyses (XRD, DTA/TG, SEM) to confirm the adoption of B6 bentonite as a preferable type and 30 min as an optimal milling time for acquiring quality of clay powder that will be used in structural and thermal applications.
PB  - Elsevier
T2  - Ceramics International
T1  - Optimization of bentonite clay mechano-chemical activation using artificial neural network modeling
SP  - 2549
EP  - 2562
VL  - 43
IS  - 2
DO  - 10.1016/j.ceramint.2016.11.058
UR  - https://hdl.handle.net/21.15107/rcub_dais_2350
ER  - 

@article{
author = "Terzić, Anja and Pezo, Lato and Andrić, Ljubiša and Pavlović, Vladimir B. and Mitić, Vojislav V.",
year = "2017",
abstract = "The properties of seven montmorillonite-rich bentonites of different geological origin were investigated prior and subsequent to mechano-chemical processing in an ultra-centrifugal mill. The objective of the experiment was altering the bentonite types and activation parameters in order to determine the optimal milling conditions that produce material which is physico-mechanically and microstructurally applicable as a binder replacement and sorbent in the construction composites. The efficiency of bentonite activation was assessed by chemometrics and Artificial neural networks mathematical modeling. Principal component analysis and analysis of variance were used in the observation of the influence of input variables (bentonite chemical composition) and process parameters (milling duration, rotor velocity) on the product characteristics: density, specific surface area, grain size and distribution, cation exchange capacity, melting point, compressive strength, shrinkage and porosity. When the ANN models for the observed responses, related to predicted bentonite characteristics and quality, were compared to experimental results, they correctly predicted the responses. The processed data also adequately fitted to the regression second order polynomial models. The SOP models, which showed r2 values from 0.357 to 0.948, and were able to predict the observed responses in a wide range of processing parameters, while ANN models performed high prediction accuracy (0.776–0.901) and can be considered as precise for response variables prediction. The combination of the conducted mathematical analyses showed that that increase/decrease in output values was stabilized after 30 min of activation. Mathematically attained interpretations were correlated with the results of the instrumental analyses (XRD, DTA/TG, SEM) to confirm the adoption of B6 bentonite as a preferable type and 30 min as an optimal milling time for acquiring quality of clay powder that will be used in structural and thermal applications.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Optimization of bentonite clay mechano-chemical activation using artificial neural network modeling",
pages = "2549-2562",
volume = "43",
number = "2",
doi = "10.1016/j.ceramint.2016.11.058",
url = "https://hdl.handle.net/21.15107/rcub_dais_2350"
}

Terzić, A., Pezo, L., Andrić, L., Pavlović, V. B.,& Mitić, V. V.. (2017). Optimization of bentonite clay mechano-chemical activation using artificial neural network modeling. in Ceramics International
Elsevier., 43(2), 2549-2562.
https://doi.org/10.1016/j.ceramint.2016.11.058
https://hdl.handle.net/21.15107/rcub_dais_2350

Terzić A, Pezo L, Andrić L, Pavlović VB, Mitić VV. Optimization of bentonite clay mechano-chemical activation using artificial neural network modeling. in Ceramics International. 2017;43(2):2549-2562.
doi:10.1016/j.ceramint.2016.11.058
https://hdl.handle.net/21.15107/rcub_dais_2350 .

Terzić, Anja, Pezo, Lato, Andrić, Ljubiša, Pavlović, Vladimir B., Mitić, Vojislav V., "Optimization of bentonite clay mechano-chemical activation using artificial neural network modeling" in Ceramics International, 43, no. 2 (2017):2549-2562,
https://doi.org/10.1016/j.ceramint.2016.11.058 .,
https://hdl.handle.net/21.15107/rcub_dais_2350 .

TY  - CONF
AU  - Olćan, Dragan
AU  - Obradović, Nina
AU  - Filipović, Suzana
AU  - Terzić, Anja
AU  - Pavlović, Vladimir B.
AU  - Kachlik, Martin
AU  - Maca, Karel
AU  - Đorđević, Antonije
PY  - 2017
UR  - https://dais.sanu.ac.rs/123456789/4824
AB  - We present an overview of electromagnetic numerical techniques and measurement apparatus that have been used for assessing electrical properties of ceramic samples. The complex permittivity of the ceramics is typically the first electromagnetic property of interest. In the measurement approach that we use, ceramic samples, in the shape of pills with metalized faces, are placed in either a proprietary coaxial chamber or in an open fixture. The scattering parameter (reflection coefficient) is measured using a network analyzer. For the deembedding of the complex permittivity of a sample one needs precise electromagnetic simulations, including detailed models of the chamber or the open fixture. For lower and intermediate frequencies we use a numerical technique for electrostatic analysis, based on the method of moments with Galerkin testing. We create a database that is used afterwards for evaluation of the complex permittivity practically in real time. For higher frequencies, a full electrodynamic model of the chamber is developed with WIPL-D software. For all our deembedding techniques, we have also developed a detailed model of losses in the SMA coaxial connectors, which is essential for a precise evaluation of the imaginary part of the complex permittivity for low-loss dielectrics. We present results of several measurements in order to illustrate the used techniques.
PB  - Belgrade : Serbian Ceramic Society
C3  - Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017
T1  - Assessing electrical properties of ceramic samples
SP  - 51
EP  - 52
UR  - https://hdl.handle.net/21.15107/rcub_dais_4824
ER  - 

@conference{
author = "Olćan, Dragan and Obradović, Nina and Filipović, Suzana and Terzić, Anja and Pavlović, Vladimir B. and Kachlik, Martin and Maca, Karel and Đorđević, Antonije",
year = "2017",
abstract = "We present an overview of electromagnetic numerical techniques and measurement apparatus that have been used for assessing electrical properties of ceramic samples. The complex permittivity of the ceramics is typically the first electromagnetic property of interest. In the measurement approach that we use, ceramic samples, in the shape of pills with metalized faces, are placed in either a proprietary coaxial chamber or in an open fixture. The scattering parameter (reflection coefficient) is measured using a network analyzer. For the deembedding of the complex permittivity of a sample one needs precise electromagnetic simulations, including detailed models of the chamber or the open fixture. For lower and intermediate frequencies we use a numerical technique for electrostatic analysis, based on the method of moments with Galerkin testing. We create a database that is used afterwards for evaluation of the complex permittivity practically in real time. For higher frequencies, a full electrodynamic model of the chamber is developed with WIPL-D software. For all our deembedding techniques, we have also developed a detailed model of losses in the SMA coaxial connectors, which is essential for a precise evaluation of the imaginary part of the complex permittivity for low-loss dielectrics. We present results of several measurements in order to illustrate the used techniques.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017",
title = "Assessing electrical properties of ceramic samples",
pages = "51-52",
url = "https://hdl.handle.net/21.15107/rcub_dais_4824"
}

Olćan, D., Obradović, N., Filipović, S., Terzić, A., Pavlović, V. B., Kachlik, M., Maca, K.,& Đorđević, A.. (2017). Assessing electrical properties of ceramic samples. in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017
Belgrade : Serbian Ceramic Society., 51-52.
https://hdl.handle.net/21.15107/rcub_dais_4824

Olćan D, Obradović N, Filipović S, Terzić A, Pavlović VB, Kachlik M, Maca K, Đorđević A. Assessing electrical properties of ceramic samples. in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017. 2017;:51-52.
https://hdl.handle.net/21.15107/rcub_dais_4824 .

Olćan, Dragan, Obradović, Nina, Filipović, Suzana, Terzić, Anja, Pavlović, Vladimir B., Kachlik, Martin, Maca, Karel, Đorđević, Antonije, "Assessing electrical properties of ceramic samples" in Program and the Book of Abstracts / Serbian Ceramic Society Conference Advanced Ceramics and Application VI: New Frontiers in Multifunctional Material Science and Processing, Serbia, Belgrade, September 18-20, 2017 (2017):51-52,
https://hdl.handle.net/21.15107/rcub_dais_4824 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Mitić, Vojislav V.
AU  - Kocić, Ljubiša
AU  - Radojević, Zagorka
AU  - Pašalić, Snežana
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/3546
AB  - The surface topography analysis via fractals as a means of explanation of composite materials mechanical and microstructural characteristics has hardly been reported so far. This study proposes a method of fractal analysis and its application to refractory bauxite concrete surface tribological investigation. Fractal dimension, profilegrams and fast Fourier transform method are introduced and supported by the adequate software for analysing contours and surface roughness, depending on the observation scale and also numerically depending on horizontal lines intercepted by the investigated profile. Also, the Richardson method and Kaye modification are applied to distinguish textured and structured aspect of grain contour geometry. Microstructural investigation was carried out using a scanning electron microscope. Using the fractals of the grains contact surfaces, a reconstruction of microstructure configuration, as grains shapes or inter-granular contacts, has been performed. Obtained results indicated that fractal analyses of contact surfaces of different shapes were very important for the prognosis of the concrete behaviour. The novel approach to the investigation of refractory concrete properties was successfully conducted, as a result introducing fractal identification as a means of composite materials performances evaluation. © 2015 International Institute for the Science of Sintering (IISS). All rights reserved.
PB  - Belgrade : International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Mechanical properties and microstructure fractal analysis of refractory bauxite concrete
SP  - 331
EP  - 346
VL  - 47
IS  - 3
DO  - 10.2298/SOS1503331T
UR  - https://hdl.handle.net/21.15107/rcub_dais_3546
ER  - 

@article{
author = "Terzić, Anja and Mitić, Vojislav V. and Kocić, Ljubiša and Radojević, Zagorka and Pašalić, Snežana",
year = "2015",
abstract = "The surface topography analysis via fractals as a means of explanation of composite materials mechanical and microstructural characteristics has hardly been reported so far. This study proposes a method of fractal analysis and its application to refractory bauxite concrete surface tribological investigation. Fractal dimension, profilegrams and fast Fourier transform method are introduced and supported by the adequate software for analysing contours and surface roughness, depending on the observation scale and also numerically depending on horizontal lines intercepted by the investigated profile. Also, the Richardson method and Kaye modification are applied to distinguish textured and structured aspect of grain contour geometry. Microstructural investigation was carried out using a scanning electron microscope. Using the fractals of the grains contact surfaces, a reconstruction of microstructure configuration, as grains shapes or inter-granular contacts, has been performed. Obtained results indicated that fractal analyses of contact surfaces of different shapes were very important for the prognosis of the concrete behaviour. The novel approach to the investigation of refractory concrete properties was successfully conducted, as a result introducing fractal identification as a means of composite materials performances evaluation. © 2015 International Institute for the Science of Sintering (IISS). All rights reserved.",
publisher = "Belgrade : International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Mechanical properties and microstructure fractal analysis of refractory bauxite concrete",
pages = "331-346",
volume = "47",
number = "3",
doi = "10.2298/SOS1503331T",
url = "https://hdl.handle.net/21.15107/rcub_dais_3546"
}

Terzić, A., Mitić, V. V., Kocić, L., Radojević, Z.,& Pašalić, S.. (2015). Mechanical properties and microstructure fractal analysis of refractory bauxite concrete. in Science of Sintering
Belgrade : International Institute for the Science of Sintering., 47(3), 331-346.
https://doi.org/10.2298/SOS1503331T
https://hdl.handle.net/21.15107/rcub_dais_3546

Terzić A, Mitić VV, Kocić L, Radojević Z, Pašalić S. Mechanical properties and microstructure fractal analysis of refractory bauxite concrete. in Science of Sintering. 2015;47(3):331-346.
doi:10.2298/SOS1503331T
https://hdl.handle.net/21.15107/rcub_dais_3546 .

Terzić, Anja, Mitić, Vojislav V., Kocić, Ljubiša, Radojević, Zagorka, Pašalić, Snežana, "Mechanical properties and microstructure fractal analysis of refractory bauxite concrete" in Science of Sintering, 47, no. 3 (2015):331-346,
https://doi.org/10.2298/SOS1503331T .,
https://hdl.handle.net/21.15107/rcub_dais_3546 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Obradović, Nina
AU  - Andrić, Ljubiša
AU  - Stojanović, Jovica
AU  - Pavlović, Vladimir B.
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/3545
AB  - The effects that the fly ash addition has on the behavior of thermally resistant corundum concrete were discussed. Experimental program implied production of two refractory composites: "referent" concrete from 20 % of high-aluminate cement and 80 % of corundum aggregate, "recycled" concrete from 10 % of high-aluminate cement, 20 % of lignite coal ash, and 70 % of corundum aggregate. The fly ash was mechanically activated by a vibratory disk mill. In the concrete matrix, the ash had a role of cement partial replacement and microfiller. The mechanical and thermal properties of the concretes were studied at temperatures ranging from ambient to 1,400 °C as adopted maximum. Mechanisms of thermally induced processes were observed by differential thermal analysis at 10, 20, and 30 °C min-1 heating rates. Referent and recycled concretes showed differences in calculated activation energies. The variations in refractory concretes performances were discussed with support of scanning electron microscope imagining and X-ray diffraction results. The recycled ash concrete exhibited properties that met the requirements for the castables, which proves it suitable for use in severe conditions at high temperature and highlights the reusing principle and possibility of cleaner and economically sustainable production. © 2014 Akadémiai Kiadó, Budapest, Hungary.
PB  - Springer Netherlands
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Investigation of thermally induced processes in corundum refractory concretes with addition of fly ash
SP  - 1339
EP  - 1352
VL  - 119
IS  - 2
DO  - 10.1007/s10973-014-4230-4
UR  - https://hdl.handle.net/21.15107/rcub_dais_3545
ER  - 

@article{
author = "Terzić, Anja and Obradović, Nina and Andrić, Ljubiša and Stojanović, Jovica and Pavlović, Vladimir B.",
year = "2015",
abstract = "The effects that the fly ash addition has on the behavior of thermally resistant corundum concrete were discussed. Experimental program implied production of two refractory composites: "referent" concrete from 20 % of high-aluminate cement and 80 % of corundum aggregate, "recycled" concrete from 10 % of high-aluminate cement, 20 % of lignite coal ash, and 70 % of corundum aggregate. The fly ash was mechanically activated by a vibratory disk mill. In the concrete matrix, the ash had a role of cement partial replacement and microfiller. The mechanical and thermal properties of the concretes were studied at temperatures ranging from ambient to 1,400 °C as adopted maximum. Mechanisms of thermally induced processes were observed by differential thermal analysis at 10, 20, and 30 °C min-1 heating rates. Referent and recycled concretes showed differences in calculated activation energies. The variations in refractory concretes performances were discussed with support of scanning electron microscope imagining and X-ray diffraction results. The recycled ash concrete exhibited properties that met the requirements for the castables, which proves it suitable for use in severe conditions at high temperature and highlights the reusing principle and possibility of cleaner and economically sustainable production. © 2014 Akadémiai Kiadó, Budapest, Hungary.",
publisher = "Springer Netherlands",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Investigation of thermally induced processes in corundum refractory concretes with addition of fly ash",
pages = "1339-1352",
volume = "119",
number = "2",
doi = "10.1007/s10973-014-4230-4",
url = "https://hdl.handle.net/21.15107/rcub_dais_3545"
}

Terzić, A., Obradović, N., Andrić, L., Stojanović, J.,& Pavlović, V. B.. (2015). Investigation of thermally induced processes in corundum refractory concretes with addition of fly ash. in Journal of Thermal Analysis and Calorimetry
Springer Netherlands., 119(2), 1339-1352.
https://doi.org/10.1007/s10973-014-4230-4
https://hdl.handle.net/21.15107/rcub_dais_3545

Terzić A, Obradović N, Andrić L, Stojanović J, Pavlović VB. Investigation of thermally induced processes in corundum refractory concretes with addition of fly ash. in Journal of Thermal Analysis and Calorimetry. 2015;119(2):1339-1352.
doi:10.1007/s10973-014-4230-4
https://hdl.handle.net/21.15107/rcub_dais_3545 .

Terzić, Anja, Obradović, Nina, Andrić, Ljubiša, Stojanović, Jovica, Pavlović, Vladimir B., "Investigation of thermally induced processes in corundum refractory concretes with addition of fly ash" in Journal of Thermal Analysis and Calorimetry, 119, no. 2 (2015):1339-1352,
https://doi.org/10.1007/s10973-014-4230-4 .,
https://hdl.handle.net/21.15107/rcub_dais_3545 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Pavlović, Ljubica
AU  - Radojević, Zagorka
AU  - Pavlović, Vladimir B.
AU  - Mitić, Vojislav V.
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/3541
AB  - In this study, the feasibility of using fly ash to manufacture high-temperature mortars was investigated. The investigation was set to define preliminary characteristics of new types of mortars based on ordinary and/or refractory cement with fly ash addition, and to establish mutual correlation between thermally induced changes of mineral phases, microstructure, and final performances of the mortars. New mortars, made up of 21% cement (PC-CEM I 42.5R/HAC-Secar 70/71), 70% river sand, and 9% fly ash, were chemically, physically, and mechanically characterized to determine possibilities of fly ash re-utilization for high-temperature purposes. The fly ash samples, which originated from four different power plants, were mechanically activated. Mortars were heat-treated up to 1300°C in a laboratory tunnel furnace with retention time 2 h. Thermal stability of crystalline phases were studied by differential thermal analysis (DTA); thermally induced changes in mineral phase composition were analyzed by XRD; and microstructure were investigated by scanning electron microscopy. Correlated results of DTA, XRD, and SEM analyses indicated initiation of sintering processes at approximately 1300°C and formation of thermally stable minerals (rankinite, gehlenite, anorthite, cristobalite). The investigation highlights a sustainable approach of using fly ash in developing ecofriendly mortars for high-temperature application. © 2013 The American Ceramic Society.
PB  - Hoboken, NJ : John Wiley & Sons
T2  - International Journal of Applied Ceramic Technology
T1  - Novel utilization of fly ash for high-temperature mortars: Phase composition, microstructure and performances correlation
SP  - 133
EP  - 146
VL  - 12
IS  - 1
DO  - 10.1111/ijac.12135
UR  - https://hdl.handle.net/21.15107/rcub_dais_3541
ER  - 

@article{
author = "Terzić, Anja and Pavlović, Ljubica and Radojević, Zagorka and Pavlović, Vladimir B. and Mitić, Vojislav V.",
year = "2015",
abstract = "In this study, the feasibility of using fly ash to manufacture high-temperature mortars was investigated. The investigation was set to define preliminary characteristics of new types of mortars based on ordinary and/or refractory cement with fly ash addition, and to establish mutual correlation between thermally induced changes of mineral phases, microstructure, and final performances of the mortars. New mortars, made up of 21% cement (PC-CEM I 42.5R/HAC-Secar 70/71), 70% river sand, and 9% fly ash, were chemically, physically, and mechanically characterized to determine possibilities of fly ash re-utilization for high-temperature purposes. The fly ash samples, which originated from four different power plants, were mechanically activated. Mortars were heat-treated up to 1300°C in a laboratory tunnel furnace with retention time 2 h. Thermal stability of crystalline phases were studied by differential thermal analysis (DTA); thermally induced changes in mineral phase composition were analyzed by XRD; and microstructure were investigated by scanning electron microscopy. Correlated results of DTA, XRD, and SEM analyses indicated initiation of sintering processes at approximately 1300°C and formation of thermally stable minerals (rankinite, gehlenite, anorthite, cristobalite). The investigation highlights a sustainable approach of using fly ash in developing ecofriendly mortars for high-temperature application. © 2013 The American Ceramic Society.",
publisher = "Hoboken, NJ : John Wiley & Sons",
journal = "International Journal of Applied Ceramic Technology",
title = "Novel utilization of fly ash for high-temperature mortars: Phase composition, microstructure and performances correlation",
pages = "133-146",
volume = "12",
number = "1",
doi = "10.1111/ijac.12135",
url = "https://hdl.handle.net/21.15107/rcub_dais_3541"
}

Terzić, A., Pavlović, L., Radojević, Z., Pavlović, V. B.,& Mitić, V. V.. (2015). Novel utilization of fly ash for high-temperature mortars: Phase composition, microstructure and performances correlation. in International Journal of Applied Ceramic Technology
Hoboken, NJ : John Wiley & Sons., 12(1), 133-146.
https://doi.org/10.1111/ijac.12135
https://hdl.handle.net/21.15107/rcub_dais_3541

Terzić A, Pavlović L, Radojević Z, Pavlović VB, Mitić VV. Novel utilization of fly ash for high-temperature mortars: Phase composition, microstructure and performances correlation. in International Journal of Applied Ceramic Technology. 2015;12(1):133-146.
doi:10.1111/ijac.12135
https://hdl.handle.net/21.15107/rcub_dais_3541 .

Terzić, Anja, Pavlović, Ljubica, Radojević, Zagorka, Pavlović, Vladimir B., Mitić, Vojislav V., "Novel utilization of fly ash for high-temperature mortars: Phase composition, microstructure and performances correlation" in International Journal of Applied Ceramic Technology, 12, no. 1 (2015):133-146,
https://doi.org/10.1111/ijac.12135 .,
https://hdl.handle.net/21.15107/rcub_dais_3541 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Pezo, Lato
AU  - Mitić, Vojislav V.
AU  - Radojević, Zagorka
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/3536
AB  - The effect of the application of pelletized fly ash based aggregates obtained through different processing techniques on the behavior of lightweight concretes was analyzed. Experimental program implied production of four lightweight artificial aggregates - cold bonded and sintered pellets based on either mechanically activated or non-activated low-calcium fly ash and water glass. The lightweight concrete behavior was compared to that of normal-weight concrete through compressive strength, flexural strength, porosity, shrinkage, and modulus of elasticity investigation. Differences in concretes characteristics were discussed with SEM imagining support. The statistical analysis of lightweight aggregate and ash properties contribution on concrete performances was realized by analysis variance model (ANOVA). Optimal production combination that maximizes lightweight concrete performance was determined by employing response surface methodology. An increase in concrete strength induced by the increase in ash fineness was noticed. Mechanical activation also had effect on the pellets sintering period and sintering temperature reduction. The 28- and 56-day lightweight concrete specimens exhibited properties that met the requirements for normal-weight concretes. Finally, the ideal combinations of ash pellets production parameters and properties that gave the lightweight concrete with behavior matching to that of standard concrete were established. The production capability of lightweight concrete with advanced performances based on artificial aggregate approves the principle of waste material reusing and enables cleaner and economically sustainable concrete manufacturing procedure. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
PB  - Elsevier
T2  - Ceramics International
T1  - Artificial fly ash based aggregates properties influence on lightweight concrete performances
SP  - 2714
EP  - 2726
VL  - 41
IS  - 2
DO  - 10.1016/j.ceramint.2014.10.086
UR  - https://hdl.handle.net/21.15107/rcub_dais_3536
ER  - 

@article{
author = "Terzić, Anja and Pezo, Lato and Mitić, Vojislav V. and Radojević, Zagorka",
year = "2015",
abstract = "The effect of the application of pelletized fly ash based aggregates obtained through different processing techniques on the behavior of lightweight concretes was analyzed. Experimental program implied production of four lightweight artificial aggregates - cold bonded and sintered pellets based on either mechanically activated or non-activated low-calcium fly ash and water glass. The lightweight concrete behavior was compared to that of normal-weight concrete through compressive strength, flexural strength, porosity, shrinkage, and modulus of elasticity investigation. Differences in concretes characteristics were discussed with SEM imagining support. The statistical analysis of lightweight aggregate and ash properties contribution on concrete performances was realized by analysis variance model (ANOVA). Optimal production combination that maximizes lightweight concrete performance was determined by employing response surface methodology. An increase in concrete strength induced by the increase in ash fineness was noticed. Mechanical activation also had effect on the pellets sintering period and sintering temperature reduction. The 28- and 56-day lightweight concrete specimens exhibited properties that met the requirements for normal-weight concretes. Finally, the ideal combinations of ash pellets production parameters and properties that gave the lightweight concrete with behavior matching to that of standard concrete were established. The production capability of lightweight concrete with advanced performances based on artificial aggregate approves the principle of waste material reusing and enables cleaner and economically sustainable concrete manufacturing procedure. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Artificial fly ash based aggregates properties influence on lightweight concrete performances",
pages = "2714-2726",
volume = "41",
number = "2",
doi = "10.1016/j.ceramint.2014.10.086",
url = "https://hdl.handle.net/21.15107/rcub_dais_3536"
}

Terzić, A., Pezo, L., Mitić, V. V.,& Radojević, Z.. (2015). Artificial fly ash based aggregates properties influence on lightweight concrete performances. in Ceramics International
Elsevier., 41(2), 2714-2726.
https://doi.org/10.1016/j.ceramint.2014.10.086
https://hdl.handle.net/21.15107/rcub_dais_3536

Terzić A, Pezo L, Mitić VV, Radojević Z. Artificial fly ash based aggregates properties influence on lightweight concrete performances. in Ceramics International. 2015;41(2):2714-2726.
doi:10.1016/j.ceramint.2014.10.086
https://hdl.handle.net/21.15107/rcub_dais_3536 .

Terzić, Anja, Pezo, Lato, Mitić, Vojislav V., Radojević, Zagorka, "Artificial fly ash based aggregates properties influence on lightweight concrete performances" in Ceramics International, 41, no. 2 (2015):2714-2726,
https://doi.org/10.1016/j.ceramint.2014.10.086 .,
https://hdl.handle.net/21.15107/rcub_dais_3536 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Pezo, Lato
AU  - Andrić, Ljubiša
AU  - Mitić, Vojislav
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/3525
AB  - The impact of the mechanical processing parameters on the alumina grain-size distribution affiliated characteristics and on the γ to α phase transformation rate was investigated. The moderation in the alumina samples behavior has been correlated to the granulometric and mineralogical changes induced by activation via an ultra-centrifugal mill. The assessment of the activation process variables influence on the final quality of the product parameters was conveyed in order to optimize the mechanical treatment of the alumina, which otherwise could be regarded as either energetically or economically unsustainable procedure. The Response Surface Method, Standard Score Analysis and Principal Component Analysis were applied as means of the mechanical activation optimization. The r 2 values obtained by developed models were in range from 0.816 to 0.988. The established mathematical models were able to precisely predict the quality parameters in a broad range of processing parameters. The Standard Score Analysis emphasized that the optimal output sample was obtained using a sieve mesh of 120μm set of processing parameters (SS=0.96). Diverse comparison analyses disclosed that the optimal set of activation process parameters could reduce the negative effect of γ-alumina samples immanent properties on the final score, and furthermore to enhance the rate of γ to α transition which would improve energetic and economic sustainability of the alumina phase transformation procedure. © 2015 Elsevier Ltd and Techna Group S.r.l.
PB  - Elsevier
T2  - Ceramics International
T1  - Analytical modeling of activation procedure applied in α-alumina thermo-mechanical synthesis
SP  - 11908
EP  - 11917
VL  - 41
IS  - 9, Part B
DO  - 10.1016/j.ceramint.2015.05.158
UR  - https://hdl.handle.net/21.15107/rcub_dais_3525
ER  - 

@article{
author = "Terzić, Anja and Pezo, Lato and Andrić, Ljubiša and Mitić, Vojislav",
year = "2015",
abstract = "The impact of the mechanical processing parameters on the alumina grain-size distribution affiliated characteristics and on the γ to α phase transformation rate was investigated. The moderation in the alumina samples behavior has been correlated to the granulometric and mineralogical changes induced by activation via an ultra-centrifugal mill. The assessment of the activation process variables influence on the final quality of the product parameters was conveyed in order to optimize the mechanical treatment of the alumina, which otherwise could be regarded as either energetically or economically unsustainable procedure. The Response Surface Method, Standard Score Analysis and Principal Component Analysis were applied as means of the mechanical activation optimization. The r 2 values obtained by developed models were in range from 0.816 to 0.988. The established mathematical models were able to precisely predict the quality parameters in a broad range of processing parameters. The Standard Score Analysis emphasized that the optimal output sample was obtained using a sieve mesh of 120μm set of processing parameters (SS=0.96). Diverse comparison analyses disclosed that the optimal set of activation process parameters could reduce the negative effect of γ-alumina samples immanent properties on the final score, and furthermore to enhance the rate of γ to α transition which would improve energetic and economic sustainability of the alumina phase transformation procedure. © 2015 Elsevier Ltd and Techna Group S.r.l.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Analytical modeling of activation procedure applied in α-alumina thermo-mechanical synthesis",
pages = "11908-11917",
volume = "41",
number = "9, Part B",
doi = "10.1016/j.ceramint.2015.05.158",
url = "https://hdl.handle.net/21.15107/rcub_dais_3525"
}

Terzić, A., Pezo, L., Andrić, L.,& Mitić, V.. (2015). Analytical modeling of activation procedure applied in α-alumina thermo-mechanical synthesis. in Ceramics International
Elsevier., 41(9, Part B), 11908-11917.
https://doi.org/10.1016/j.ceramint.2015.05.158
https://hdl.handle.net/21.15107/rcub_dais_3525

Terzić A, Pezo L, Andrić L, Mitić V. Analytical modeling of activation procedure applied in α-alumina thermo-mechanical synthesis. in Ceramics International. 2015;41(9, Part B):11908-11917.
doi:10.1016/j.ceramint.2015.05.158
https://hdl.handle.net/21.15107/rcub_dais_3525 .

Terzić, Anja, Pezo, Lato, Andrić, Ljubiša, Mitić, Vojislav, "Analytical modeling of activation procedure applied in α-alumina thermo-mechanical synthesis" in Ceramics International, 41, no. 9, Part B (2015):11908-11917,
https://doi.org/10.1016/j.ceramint.2015.05.158 .,
https://hdl.handle.net/21.15107/rcub_dais_3525 .

TY  - CONF
AU  - Terzić, Anja
AU  - Obradović, Nina
AU  - Miličić, Ljiljana
AU  - Radojević, Zagorka
PY  - 2015
UR  - https://dais.sanu.ac.rs/123456789/760
AB  - A comparative study of several concrete composites with different quantities of micro silica was conducted. The effect that micro silica addition has on the behavior of concrete was discussed. The experimental program implied production of "referent" concrete composite based on Portland cement and river sand, and concretes with 5, 10, and 15 wt.% addition of micro silica. Micro silica was used as micro filler in the concrete mass. The influence of this additive on the concrete mechanical properties and on its thermal behavior was investigated. This research highlighted the role that fine micro silica particles have in improvement of composite microstructure packing, the decrease of the porosities values and enhancement in the compressive strength due to the decrease in pore size. The thermal behavior of the concretes was studied at temperatures ranging from ambient to 1100°C as adopted maximum. Mechanisms of thermally induced processes were observed by differential thermal analysis, at 10°C min-1 heating rates, and by thermo gravimetric analysis. The variations in concretes performances were discussed with support of scanning electron
microscope imagining and X-ray diffraction results. The composites with addition of micro silica exhibited properties that met the requirements for the concretes suitable for use in severe conditions and environments.
PB  - Ljubljana : Central and Eastern European Committee for Thermal Analysis and Calorimetry
C3  - 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry 25-28 August 2015, Ljubljana, Slovenia: Book of Abstracts
T1  - Thermal behaviour of concretes with micro silica addition
SP  - 271
EP  - 271
UR  - https://hdl.handle.net/21.15107/rcub_dais_760
ER  - 

@conference{
author = "Terzić, Anja and Obradović, Nina and Miličić, Ljiljana and Radojević, Zagorka",
year = "2015",
abstract = "A comparative study of several concrete composites with different quantities of micro silica was conducted. The effect that micro silica addition has on the behavior of concrete was discussed. The experimental program implied production of "referent" concrete composite based on Portland cement and river sand, and concretes with 5, 10, and 15 wt.% addition of micro silica. Micro silica was used as micro filler in the concrete mass. The influence of this additive on the concrete mechanical properties and on its thermal behavior was investigated. This research highlighted the role that fine micro silica particles have in improvement of composite microstructure packing, the decrease of the porosities values and enhancement in the compressive strength due to the decrease in pore size. The thermal behavior of the concretes was studied at temperatures ranging from ambient to 1100°C as adopted maximum. Mechanisms of thermally induced processes were observed by differential thermal analysis, at 10°C min-1 heating rates, and by thermo gravimetric analysis. The variations in concretes performances were discussed with support of scanning electron
microscope imagining and X-ray diffraction results. The composites with addition of micro silica exhibited properties that met the requirements for the concretes suitable for use in severe conditions and environments.",
publisher = "Ljubljana : Central and Eastern European Committee for Thermal Analysis and Calorimetry",
journal = "3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry 25-28 August 2015, Ljubljana, Slovenia: Book of Abstracts",
title = "Thermal behaviour of concretes with micro silica addition",
pages = "271-271",
url = "https://hdl.handle.net/21.15107/rcub_dais_760"
}

Terzić, A., Obradović, N., Miličić, L.,& Radojević, Z.. (2015). Thermal behaviour of concretes with micro silica addition. in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry 25-28 August 2015, Ljubljana, Slovenia: Book of Abstracts
Ljubljana : Central and Eastern European Committee for Thermal Analysis and Calorimetry., 271-271.
https://hdl.handle.net/21.15107/rcub_dais_760

Terzić A, Obradović N, Miličić L, Radojević Z. Thermal behaviour of concretes with micro silica addition. in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry 25-28 August 2015, Ljubljana, Slovenia: Book of Abstracts. 2015;:271-271.
https://hdl.handle.net/21.15107/rcub_dais_760 .

Terzić, Anja, Obradović, Nina, Miličić, Ljiljana, Radojević, Zagorka, "Thermal behaviour of concretes with micro silica addition" in 3rd Central and Eastern European Conference on Thermal Analysis and Calorimetry 25-28 August 2015, Ljubljana, Slovenia: Book of Abstracts (2015):271-271,
https://hdl.handle.net/21.15107/rcub_dais_760 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Andrić, Ljubiša
AU  - Stojanović, J.
AU  - Obradović, Nina
AU  - Kostović, M.
PY  - 2014
UR  - https://dais.sanu.ac.rs/123456789/667
AB  - The effect of vibratory mill induced mechanical activation on the change of the particle size, crystallinity and the phase transformations of the minerals present in the activated material, was studied with the purpose of decreasing of the sintering temperature of talc (Mg3Si4O10(OH)2) as raw material which is the basic component of the steatite ceramics. The aims of the conducted investigation were, also, increasing of the reactivity of the comminuted raw material and establishing of the optimal activation period. The properties of the activated talc induced by mechanical force were expressed in form of the grain inertia change which was measured by means of automatic grain counter. Mechanically activated grains are the most convenient mineral form for physical concentration since the energy change of the mill-material system is recorded on them. The effect of dry grinding on the structure, particle size and shape of talc was studied by means of XRD, DTA and SEM/EDS methods. Activation of talc produced an increase of the starting surface area value progressively from 4.5 m2/g up to a maximum of 108.5 m2/g achieved at 30 min. A subsequent decrease of rate of surface area change and the rate of size reduction were observed following the prolonged grinding. Talc activated in vibratory mill for optimal 30 min showed properties which positively influence the decrease of sintering temperature and the increase of the sintering rate of steatite ceramics. [Projekat Ministarstva nauke Republike Srbije, br. 172057, br. 45008 i br. 33007]
PB  - Belgrade : Interenational Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Mechanical activation as sintering pre-treatment of talc for steatite ceramics
SP  - 247
EP  - 258
VL  - 46
IS  - 2
DO  - 10.2298/SOS1402247T
UR  - https://hdl.handle.net/21.15107/rcub_dais_667
ER  - 

@article{
author = "Terzić, Anja and Andrić, Ljubiša and Stojanović, J. and Obradović, Nina and Kostović, M.",
year = "2014",
abstract = "The effect of vibratory mill induced mechanical activation on the change of the particle size, crystallinity and the phase transformations of the minerals present in the activated material, was studied with the purpose of decreasing of the sintering temperature of talc (Mg3Si4O10(OH)2) as raw material which is the basic component of the steatite ceramics. The aims of the conducted investigation were, also, increasing of the reactivity of the comminuted raw material and establishing of the optimal activation period. The properties of the activated talc induced by mechanical force were expressed in form of the grain inertia change which was measured by means of automatic grain counter. Mechanically activated grains are the most convenient mineral form for physical concentration since the energy change of the mill-material system is recorded on them. The effect of dry grinding on the structure, particle size and shape of talc was studied by means of XRD, DTA and SEM/EDS methods. Activation of talc produced an increase of the starting surface area value progressively from 4.5 m2/g up to a maximum of 108.5 m2/g achieved at 30 min. A subsequent decrease of rate of surface area change and the rate of size reduction were observed following the prolonged grinding. Talc activated in vibratory mill for optimal 30 min showed properties which positively influence the decrease of sintering temperature and the increase of the sintering rate of steatite ceramics. [Projekat Ministarstva nauke Republike Srbije, br. 172057, br. 45008 i br. 33007]",
publisher = "Belgrade : Interenational Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Mechanical activation as sintering pre-treatment of talc for steatite ceramics",
pages = "247-258",
volume = "46",
number = "2",
doi = "10.2298/SOS1402247T",
url = "https://hdl.handle.net/21.15107/rcub_dais_667"
}

Terzić, A., Andrić, L., Stojanović, J., Obradović, N.,& Kostović, M.. (2014). Mechanical activation as sintering pre-treatment of talc for steatite ceramics. in Science of Sintering
Belgrade : Interenational Institute for the Science of Sintering., 46(2), 247-258.
https://doi.org/10.2298/SOS1402247T
https://hdl.handle.net/21.15107/rcub_dais_667

Terzić A, Andrić L, Stojanović J, Obradović N, Kostović M. Mechanical activation as sintering pre-treatment of talc for steatite ceramics. in Science of Sintering. 2014;46(2):247-258.
doi:10.2298/SOS1402247T
https://hdl.handle.net/21.15107/rcub_dais_667 .

Terzić, Anja, Andrić, Ljubiša, Stojanović, J., Obradović, Nina, Kostović, M., "Mechanical activation as sintering pre-treatment of talc for steatite ceramics" in Science of Sintering, 46, no. 2 (2014):247-258,
https://doi.org/10.2298/SOS1402247T .,
https://hdl.handle.net/21.15107/rcub_dais_667 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Andrić, Ljubiša
AU  - Mitić, Vojislav V.
PY  - 2014
UR  - https://dais.sanu.ac.rs/123456789/666
AB  - In this study, the feasibility of alumina phase transition enhancement by mechanical activation was conducted. It was showed that the milling environment plays an important role on the physical, chemical and thermal behavior of the alumina powder utilized as refractory component material. The aim of the investigation was to increase the reactivity of the starting γ-Al2O3 by mechanical treatment in two types of high-energy activators – vibratory disc mill and vibratory ball mill. In continuation, the decrease of the subsequent sintering temperature as well as the treatment duration would be induced by making the transition into final thermo-stable α-Al2O3 modification easier and faster. Full factorial experiment was conducted and the results were analyzed by the proposed mathematical model in order to understand the effects of the activation process variables on the amount and physical characteristics of the synthesized (activated and subsequently thermally treated) product and to establish the optimal activation period. As the result of the analysis, operation parameters of the activator and activation period were found to be the most important factors. The initial γ-Al2O3 and synthesized α-Al2O3 were thoroughly analyzed by DTA, XRD, IR and SEM methods. Thermal behavior of γ and α-modification were studied by differential thermal analysis conducted in the same environment, under same heating rates. X-ray diffraction analysis gave reliable identification of the crystal phases and changes in crystallinity of treated alumina. Based on XRD peak intensity measurements, the γ-Al2O3 almost completely passed (95%) into α-Al2O3 after 180 min of activation in vibratory ball mill and subsequent thermal treatment (2 h/1200 °C). SEM microphotographs with accompanying image analysis PC program highlighted changes in size and shape of particles of initial and synthesized Al2O3. Synthesized Al2O3 exquisite thermal behavior characteristic for refractory compounds, demonstrated that it is possible to obtain α-alumina at lower transformation temperatures in shorter time intervals by applying mechanical activation.
PB  - Elsevier
T2  - Ceramics International
T1  - Assessment of intensive grinding effects on alumina as refractory compound: Acceleration of γ to α phase transformation mechanism
SP  - 14851
EP  - 14863
VL  - 40
IS  - 8 Part B
DO  - 10.1016/j.ceramint.2014.06.080
UR  - https://hdl.handle.net/21.15107/rcub_dais_666
ER  - 

@article{
author = "Terzić, Anja and Andrić, Ljubiša and Mitić, Vojislav V.",
year = "2014",
abstract = "In this study, the feasibility of alumina phase transition enhancement by mechanical activation was conducted. It was showed that the milling environment plays an important role on the physical, chemical and thermal behavior of the alumina powder utilized as refractory component material. The aim of the investigation was to increase the reactivity of the starting γ-Al2O3 by mechanical treatment in two types of high-energy activators – vibratory disc mill and vibratory ball mill. In continuation, the decrease of the subsequent sintering temperature as well as the treatment duration would be induced by making the transition into final thermo-stable α-Al2O3 modification easier and faster. Full factorial experiment was conducted and the results were analyzed by the proposed mathematical model in order to understand the effects of the activation process variables on the amount and physical characteristics of the synthesized (activated and subsequently thermally treated) product and to establish the optimal activation period. As the result of the analysis, operation parameters of the activator and activation period were found to be the most important factors. The initial γ-Al2O3 and synthesized α-Al2O3 were thoroughly analyzed by DTA, XRD, IR and SEM methods. Thermal behavior of γ and α-modification were studied by differential thermal analysis conducted in the same environment, under same heating rates. X-ray diffraction analysis gave reliable identification of the crystal phases and changes in crystallinity of treated alumina. Based on XRD peak intensity measurements, the γ-Al2O3 almost completely passed (95%) into α-Al2O3 after 180 min of activation in vibratory ball mill and subsequent thermal treatment (2 h/1200 °C). SEM microphotographs with accompanying image analysis PC program highlighted changes in size and shape of particles of initial and synthesized Al2O3. Synthesized Al2O3 exquisite thermal behavior characteristic for refractory compounds, demonstrated that it is possible to obtain α-alumina at lower transformation temperatures in shorter time intervals by applying mechanical activation.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Assessment of intensive grinding effects on alumina as refractory compound: Acceleration of γ to α phase transformation mechanism",
pages = "14851-14863",
volume = "40",
number = "8 Part B",
doi = "10.1016/j.ceramint.2014.06.080",
url = "https://hdl.handle.net/21.15107/rcub_dais_666"
}

Terzić, A., Andrić, L.,& Mitić, V. V.. (2014). Assessment of intensive grinding effects on alumina as refractory compound: Acceleration of γ to α phase transformation mechanism. in Ceramics International
Elsevier., 40(8 Part B), 14851-14863.
https://doi.org/10.1016/j.ceramint.2014.06.080
https://hdl.handle.net/21.15107/rcub_dais_666

Terzić A, Andrić L, Mitić VV. Assessment of intensive grinding effects on alumina as refractory compound: Acceleration of γ to α phase transformation mechanism. in Ceramics International. 2014;40(8 Part B):14851-14863.
doi:10.1016/j.ceramint.2014.06.080
https://hdl.handle.net/21.15107/rcub_dais_666 .

Terzić, Anja, Andrić, Ljubiša, Mitić, Vojislav V., "Assessment of intensive grinding effects on alumina as refractory compound: Acceleration of γ to α phase transformation mechanism" in Ceramics International, 40, no. 8 Part B (2014):14851-14863,
https://doi.org/10.1016/j.ceramint.2014.06.080 .,
https://hdl.handle.net/21.15107/rcub_dais_666 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Andrić, Ljubiša
AU  - Mitić, Vojislav V.
PY  - 2014
UR  - https://dais.sanu.ac.rs/123456789/665
AB  - A growing demand for refractory castables with advanced properties has given rise to a continuous technological evolution and highlighted the necessity for secondary raw materials reapplication even in refractory industry. For the experiment, refractory shotcretes with the same matrix composition were prepared from 30 wt% of high aluminate cement, 40 wt% of bauxite aggregate and 30 wt% of chamotte filler. The request for obtaining a low-cement castable is fulfilled by application of mechanically activated coal ash as microfiller in one of the bauxite shotcretes. The fly ash was activated by means of vibratory disc mill and ultra-centrifugal mill, and results were compared. The shotcrete samples were dried at 110 °C during 24 h to create specimens for investigation of mechanical and thermal properties. The properties have been studied at temperatures ranging from room temperature to adopted maximal temperature 1400 °C. At maximal 1400 °C, the bauxite shotcretes were mainly composed of anorthite, corundum, mullite and cristobalite. Mechanisms of hydration and sintering were investigated by means of differential thermal analysis (DTA) at three different heating rates. DTA measurements showed different activation energies for ordinary bauxite shotcrete and shotcrete with microfiller. The evolution of the refractory shotcretes properties was investigated and correlated with microstructural changes induced by temperature and microfiller addition. The combination of advantages in investigated refractory shotcretes makes them suitable for use in severe conditions at high temperature applications especially in refractory industries.
PB  - Elsevier
T2  - Ceramics International
T1  - Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation
SP  - 12055
EP  - 12065
VL  - 40
IS  - 8, Part A
DO  - 10.1016/j.ceramint.2014.04.045
UR  - https://hdl.handle.net/21.15107/rcub_dais_665
ER  - 

@article{
author = "Terzić, Anja and Andrić, Ljubiša and Mitić, Vojislav V.",
year = "2014",
abstract = "A growing demand for refractory castables with advanced properties has given rise to a continuous technological evolution and highlighted the necessity for secondary raw materials reapplication even in refractory industry. For the experiment, refractory shotcretes with the same matrix composition were prepared from 30 wt% of high aluminate cement, 40 wt% of bauxite aggregate and 30 wt% of chamotte filler. The request for obtaining a low-cement castable is fulfilled by application of mechanically activated coal ash as microfiller in one of the bauxite shotcretes. The fly ash was activated by means of vibratory disc mill and ultra-centrifugal mill, and results were compared. The shotcrete samples were dried at 110 °C during 24 h to create specimens for investigation of mechanical and thermal properties. The properties have been studied at temperatures ranging from room temperature to adopted maximal temperature 1400 °C. At maximal 1400 °C, the bauxite shotcretes were mainly composed of anorthite, corundum, mullite and cristobalite. Mechanisms of hydration and sintering were investigated by means of differential thermal analysis (DTA) at three different heating rates. DTA measurements showed different activation energies for ordinary bauxite shotcrete and shotcrete with microfiller. The evolution of the refractory shotcretes properties was investigated and correlated with microstructural changes induced by temperature and microfiller addition. The combination of advantages in investigated refractory shotcretes makes them suitable for use in severe conditions at high temperature applications especially in refractory industries.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation",
pages = "12055-12065",
volume = "40",
number = "8, Part A",
doi = "10.1016/j.ceramint.2014.04.045",
url = "https://hdl.handle.net/21.15107/rcub_dais_665"
}

Terzić, A., Andrić, L.,& Mitić, V. V.. (2014). Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation. in Ceramics International
Elsevier., 40(8, Part A), 12055-12065.
https://doi.org/10.1016/j.ceramint.2014.04.045
https://hdl.handle.net/21.15107/rcub_dais_665

Terzić A, Andrić L, Mitić VV. Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation. in Ceramics International. 2014;40(8, Part A):12055-12065.
doi:10.1016/j.ceramint.2014.04.045
https://hdl.handle.net/21.15107/rcub_dais_665 .

Terzić, Anja, Andrić, Ljubiša, Mitić, Vojislav V., "Mechanically activated coal ash as refractory bauxite shotcrete microfiller: Thermal interactions mechanism investigation" in Ceramics International, 40, no. 8, Part A (2014):12055-12065,
https://doi.org/10.1016/j.ceramint.2014.04.045 .,
https://hdl.handle.net/21.15107/rcub_dais_665 .

TY  - CONF
AU  - Terzić, Anja
AU  - Radojević, Zagorka
AU  - Miličić, Ljiljana
AU  - Obradović, Nina
AU  - Andrić, Ljubiša
PY  - 2014
UR  - https://dais.sanu.ac.rs/123456789/604
AB  - The necessity for application of activated secondary raw materials in refractory industry is caused by a growing demand for refractory castables with advanced properties and continuous technological evolution of high-temperature materials. In this investigation, refractory shotcretes with the same matrix composition were prepared from 15 wt.% of high aluminate cement and 45 wt.% of bauxite aggregate + 30 wt.% of chamotte filler, i.e. 75% of corundum aggregate. The request for obtaining a low-cement castable is fulfilled by application of 10 wt.% of mechanically activated coal ash as the cement substitution in the shotcretes. The ash was activated by means of various high energy mechano-activators. Results were compared in order to choose the most efficient activation procedure. The properties have been studied at temperatures ranging from room temperature to adopted maximal temperature 1400°C. Mechanisms of hydration and sintering were investigated by means of differential thermal analysis at three different heating rates. The measurements showed different activation energies for ordinary shotcretes and shotcretes with activated ash. The evolution of the refractory shotcretes properties was investigated and correlated to microstructural changes induced by temperature and microfiller addition. The combination of advantages in investigated refractory shotcretes makes them suitable for use in severe conditions at high temperature applications especially in refractory industries.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014
T1  - Corundum and Bauxite Refractory Shotcretes based on Activated Waste Coal Ash: Investigation of Thermally Induced Properties Change
SP  - 70
EP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_dais_604
ER  - 

@conference{
author = "Terzić, Anja and Radojević, Zagorka and Miličić, Ljiljana and Obradović, Nina and Andrić, Ljubiša",
year = "2014",
abstract = "The necessity for application of activated secondary raw materials in refractory industry is caused by a growing demand for refractory castables with advanced properties and continuous technological evolution of high-temperature materials. In this investigation, refractory shotcretes with the same matrix composition were prepared from 15 wt.% of high aluminate cement and 45 wt.% of bauxite aggregate + 30 wt.% of chamotte filler, i.e. 75% of corundum aggregate. The request for obtaining a low-cement castable is fulfilled by application of 10 wt.% of mechanically activated coal ash as the cement substitution in the shotcretes. The ash was activated by means of various high energy mechano-activators. Results were compared in order to choose the most efficient activation procedure. The properties have been studied at temperatures ranging from room temperature to adopted maximal temperature 1400°C. Mechanisms of hydration and sintering were investigated by means of differential thermal analysis at three different heating rates. The measurements showed different activation energies for ordinary shotcretes and shotcretes with activated ash. The evolution of the refractory shotcretes properties was investigated and correlated to microstructural changes induced by temperature and microfiller addition. The combination of advantages in investigated refractory shotcretes makes them suitable for use in severe conditions at high temperature applications especially in refractory industries.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014",
title = "Corundum and Bauxite Refractory Shotcretes based on Activated Waste Coal Ash: Investigation of Thermally Induced Properties Change",
pages = "70-70",
url = "https://hdl.handle.net/21.15107/rcub_dais_604"
}

Terzić, A., Radojević, Z., Miličić, L., Obradović, N.,& Andrić, L.. (2014). Corundum and Bauxite Refractory Shotcretes based on Activated Waste Coal Ash: Investigation of Thermally Induced Properties Change. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014
Belgrade : Serbian Ceramic Society., 70-70.
https://hdl.handle.net/21.15107/rcub_dais_604

Terzić A, Radojević Z, Miličić L, Obradović N, Andrić L. Corundum and Bauxite Refractory Shotcretes based on Activated Waste Coal Ash: Investigation of Thermally Induced Properties Change. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014. 2014;:70-70.
https://hdl.handle.net/21.15107/rcub_dais_604 .

Terzić, Anja, Radojević, Zagorka, Miličić, Ljiljana, Obradović, Nina, Andrić, Ljubiša, "Corundum and Bauxite Refractory Shotcretes based on Activated Waste Coal Ash: Investigation of Thermally Induced Properties Change" in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts / III Serbian Ceramic Society Conference, 29th September - 1st October, Belgrade, 2014 (2014):70-70,
https://hdl.handle.net/21.15107/rcub_dais_604 .

TY  - CONF
AU  - Terzić, Anja
AU  - Radojević, Zagorka
AU  - Miličić, Ljiljana
AU  - Obradović, Nina
AU  - Pavlović, Vladimir B.
AU  - Pavlović, Ljubica
PY  - 2013
UR  - https://dais.sanu.ac.rs/123456789/413
AB  - As coal combustion byproduct fly ash represents a risk for environment: direct ash emission from open land-fills causes pollution of air, soil and water. The solution for this severe pollution problem is fly ash reapplication in various construction ceramic composite materials. Although pelletization of waste powdery material is a known technique in the production of artificial aggregates, it still has not been widely used in construction sector. Here investigated cold-bonded fly ash aggregate was produced in semi-industrial pelletizing device. The fly ash particles were bonded with water-glass (Sodium silicate - Na2SiO3) and used as substitution for aggregate in Portland cement based composite. Half of the produced lightweight aggregate was submitted to thermal treatment and afterwards applied in the construction composite in the same ration as in the case of cold-bonded pellets. The performance characteristics of two types of lightweight composites were mutually compared and afterwards correlated with characteristics of normal-weight concrete. Compressive strength, modulus of elasticity and tensile strength were used as represents of the composites mechanical behavior. Mineral constituents of fly ash pellets were analyzed by means of X-ray diffraction analysis, differential thermal analysis was applied in crystalline phase investigation, and scanning electron microscopy in microstructural analysis. The leaching behavior and environmental impact of hazardous elements were also analyzed. It was concluded that content of potentially toxic elements found in leachate of fly-ash based composites was far below tolerance limit proposed by actual standards for the building materials, characterizing the fly ash non-harmful secondary raw material and enabling its reapplication in building materials industry. Utilizing fly ash to produce quality aggregates should yield significant environmental benefits.
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
T1  - Lightweight construction ceramic composites based of pelletized fly ash aggregate
SP  - 32
EP  - 33
UR  - https://hdl.handle.net/21.15107/rcub_dais_413
ER  - 

@conference{
author = "Terzić, Anja and Radojević, Zagorka and Miličić, Ljiljana and Obradović, Nina and Pavlović, Vladimir B. and Pavlović, Ljubica",
year = "2013",
abstract = "As coal combustion byproduct fly ash represents a risk for environment: direct ash emission from open land-fills causes pollution of air, soil and water. The solution for this severe pollution problem is fly ash reapplication in various construction ceramic composite materials. Although pelletization of waste powdery material is a known technique in the production of artificial aggregates, it still has not been widely used in construction sector. Here investigated cold-bonded fly ash aggregate was produced in semi-industrial pelletizing device. The fly ash particles were bonded with water-glass (Sodium silicate - Na2SiO3) and used as substitution for aggregate in Portland cement based composite. Half of the produced lightweight aggregate was submitted to thermal treatment and afterwards applied in the construction composite in the same ration as in the case of cold-bonded pellets. The performance characteristics of two types of lightweight composites were mutually compared and afterwards correlated with characteristics of normal-weight concrete. Compressive strength, modulus of elasticity and tensile strength were used as represents of the composites mechanical behavior. Mineral constituents of fly ash pellets were analyzed by means of X-ray diffraction analysis, differential thermal analysis was applied in crystalline phase investigation, and scanning electron microscopy in microstructural analysis. The leaching behavior and environmental impact of hazardous elements were also analyzed. It was concluded that content of potentially toxic elements found in leachate of fly-ash based composites was far below tolerance limit proposed by actual standards for the building materials, characterizing the fly ash non-harmful secondary raw material and enabling its reapplication in building materials industry. Utilizing fly ash to produce quality aggregates should yield significant environmental benefits.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade",
title = "Lightweight construction ceramic composites based of pelletized fly ash aggregate",
pages = "32-33",
url = "https://hdl.handle.net/21.15107/rcub_dais_413"
}

Terzić, A., Radojević, Z., Miličić, L., Obradović, N., Pavlović, V. B.,& Pavlović, L.. (2013). Lightweight construction ceramic composites based of pelletized fly ash aggregate. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade
Belgrade : Serbian Ceramic Society., 32-33.
https://hdl.handle.net/21.15107/rcub_dais_413

Terzić A, Radojević Z, Miličić L, Obradović N, Pavlović VB, Pavlović L. Lightweight construction ceramic composites based of pelletized fly ash aggregate. in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade. 2013;:32-33.
https://hdl.handle.net/21.15107/rcub_dais_413 .

Terzić, Anja, Radojević, Zagorka, Miličić, Ljiljana, Obradović, Nina, Pavlović, Vladimir B., Pavlović, Ljubica, "Lightweight construction ceramic composites based of pelletized fly ash aggregate" in Advanced Ceramics and Application : new frontiers in multifunctional material science and processing : program and the book of abstracts : II Serbian Ceramic Society Conference, Sep 30th-Oct 1st, 2013, Belgrade (2013):32-33,
https://hdl.handle.net/21.15107/rcub_dais_413 .

TY  - JOUR
AU  - Obradović, Nina
AU  - Terzić, Anja
AU  - Pavlović, Ljubica
AU  - Filipović, Suzana
AU  - Pavlović, Vladimir B.
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/491
AB  - Characterization of adsorption-desorption (AD) processes of gas particles on semiconductors is necessary in order to investigate the influence of these processes on the micro/nano-devices performance. By applying a numerical computational method we determined the pressure dependence of the equilibrium coverage of the semiconductor surface by chemisorbed gas particles. We concluded that the pressure dependence of the total coverage of the surface by adparticles, and also of coverages by both the neutral and ionized adparticles, can be obtained by measuring the adsorbed mass. We propose the use of nanocantilever sensors for such extremely sensitive mass measurements. The obtained adsorption induced cantilever's resonant frequency shifts are higher than the detection threshold set by the termomechanical noise. This confirms the applicability of the used nanocantilever sensor for experimental characterization of AD processes at semiconductor surfaces.
PB  - Amsterdam : Springer Netherlands
T2  - Journal of Thermal Analysis and Calorimetry
T1  - Dehydration investigations of a refractory concrete using DTA method
SP  - 37
EP  - 41
VL  - 110
IS  - 1
DO  - 10.1007/s10973-011-1880-3
UR  - https://hdl.handle.net/21.15107/rcub_dais_491
ER  - 

@article{
author = "Obradović, Nina and Terzić, Anja and Pavlović, Ljubica and Filipović, Suzana and Pavlović, Vladimir B.",
year = "2012",
abstract = "Characterization of adsorption-desorption (AD) processes of gas particles on semiconductors is necessary in order to investigate the influence of these processes on the micro/nano-devices performance. By applying a numerical computational method we determined the pressure dependence of the equilibrium coverage of the semiconductor surface by chemisorbed gas particles. We concluded that the pressure dependence of the total coverage of the surface by adparticles, and also of coverages by both the neutral and ionized adparticles, can be obtained by measuring the adsorbed mass. We propose the use of nanocantilever sensors for such extremely sensitive mass measurements. The obtained adsorption induced cantilever's resonant frequency shifts are higher than the detection threshold set by the termomechanical noise. This confirms the applicability of the used nanocantilever sensor for experimental characterization of AD processes at semiconductor surfaces.",
publisher = "Amsterdam : Springer Netherlands",
journal = "Journal of Thermal Analysis and Calorimetry",
title = "Dehydration investigations of a refractory concrete using DTA method",
pages = "37-41",
volume = "110",
number = "1",
doi = "10.1007/s10973-011-1880-3",
url = "https://hdl.handle.net/21.15107/rcub_dais_491"
}

Obradović, N., Terzić, A., Pavlović, L., Filipović, S.,& Pavlović, V. B.. (2012). Dehydration investigations of a refractory concrete using DTA method. in Journal of Thermal Analysis and Calorimetry
Amsterdam : Springer Netherlands., 110(1), 37-41.
https://doi.org/10.1007/s10973-011-1880-3
https://hdl.handle.net/21.15107/rcub_dais_491

Obradović N, Terzić A, Pavlović L, Filipović S, Pavlović VB. Dehydration investigations of a refractory concrete using DTA method. in Journal of Thermal Analysis and Calorimetry. 2012;110(1):37-41.
doi:10.1007/s10973-011-1880-3
https://hdl.handle.net/21.15107/rcub_dais_491 .

Obradović, Nina, Terzić, Anja, Pavlović, Ljubica, Filipović, Suzana, Pavlović, Vladimir B., "Dehydration investigations of a refractory concrete using DTA method" in Journal of Thermal Analysis and Calorimetry, 110, no. 1 (2012):37-41,
https://doi.org/10.1007/s10973-011-1880-3 .,
https://hdl.handle.net/21.15107/rcub_dais_491 .

TY  - JOUR
AU  - Terzić, Anja
AU  - Pavlović, Ljubica
AU  - Obradović, Nina
AU  - Pavlović, Vladimir B.
AU  - Stojanović, J.
AU  - Miličić, Lj.
AU  - Radojević, Zagorka
AU  - Ristić, Momčilo M.
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/193
AB  - Amount of fly ash which is and yet to be generated in the coming years highlights the necessity of developing new methods of the recycling where this waste can be reused in significant quantity. A new possibility for fly ash utilization is in high-temperature application (thermal insulators or/and refractory material products). As such, fly ash has to adequately answer the mechanical and thermal stability criteria. One of the ways of achieving it is by applying mechanical activation procedure on fly ash. In present study, fly ashes from two different power plants were mechanically activated in a planetary ball mill. Mechanically treated fly ashes were cemented with two different binders: standard Portland cement and high-aluminates cement. Physico-chemical analysis and investigation of mineralogical components of composites are emphasized, due to the changes occurred in fly ash during mechanical activation and sintering of composites. Macro-performance of the composites was correlated to the microstructure of fly ash studied by means of XRD and SEM analysis. Thermal stability of crystalline phases was investigated with DTA. Highlight was placed on determination of relationship between mechanically activated fly ash and obtained composites microstructure on one side and behavior of sintered composites on the other side. [Projekat Ministarstva nauke Republike Srbije, br. 172057, 45008 and a project F-198, financed by Serbian Academy of Sciences and Arts]
PB  - Belgrade : International Institute for the Science of Sintering
T2  - Science of Sintering
T1  - Synthesis and sintering of high-temperature composites based on mechanically activated fly ash
SP  - 135
EP  - 146
VL  - 44
IS  - 2
DO  - 10.2298/SOS1202135T
UR  - https://hdl.handle.net/21.15107/rcub_dais_193
ER  - 

@article{
author = "Terzić, Anja and Pavlović, Ljubica and Obradović, Nina and Pavlović, Vladimir B. and Stojanović, J. and Miličić, Lj. and Radojević, Zagorka and Ristić, Momčilo M.",
year = "2012",
abstract = "Amount of fly ash which is and yet to be generated in the coming years highlights the necessity of developing new methods of the recycling where this waste can be reused in significant quantity. A new possibility for fly ash utilization is in high-temperature application (thermal insulators or/and refractory material products). As such, fly ash has to adequately answer the mechanical and thermal stability criteria. One of the ways of achieving it is by applying mechanical activation procedure on fly ash. In present study, fly ashes from two different power plants were mechanically activated in a planetary ball mill. Mechanically treated fly ashes were cemented with two different binders: standard Portland cement and high-aluminates cement. Physico-chemical analysis and investigation of mineralogical components of composites are emphasized, due to the changes occurred in fly ash during mechanical activation and sintering of composites. Macro-performance of the composites was correlated to the microstructure of fly ash studied by means of XRD and SEM analysis. Thermal stability of crystalline phases was investigated with DTA. Highlight was placed on determination of relationship between mechanically activated fly ash and obtained composites microstructure on one side and behavior of sintered composites on the other side. [Projekat Ministarstva nauke Republike Srbije, br. 172057, 45008 and a project F-198, financed by Serbian Academy of Sciences and Arts]",
publisher = "Belgrade : International Institute for the Science of Sintering",
journal = "Science of Sintering",
title = "Synthesis and sintering of high-temperature composites based on mechanically activated fly ash",
pages = "135-146",
volume = "44",
number = "2",
doi = "10.2298/SOS1202135T",
url = "https://hdl.handle.net/21.15107/rcub_dais_193"
}

Terzić, A., Pavlović, L., Obradović, N., Pavlović, V. B., Stojanović, J., Miličić, Lj., Radojević, Z.,& Ristić, M. M.. (2012). Synthesis and sintering of high-temperature composites based on mechanically activated fly ash. in Science of Sintering
Belgrade : International Institute for the Science of Sintering., 44(2), 135-146.
https://doi.org/10.2298/SOS1202135T
https://hdl.handle.net/21.15107/rcub_dais_193

Terzić A, Pavlović L, Obradović N, Pavlović VB, Stojanović J, Miličić L, Radojević Z, Ristić MM. Synthesis and sintering of high-temperature composites based on mechanically activated fly ash. in Science of Sintering. 2012;44(2):135-146.
doi:10.2298/SOS1202135T
https://hdl.handle.net/21.15107/rcub_dais_193 .

Terzić, Anja, Pavlović, Ljubica, Obradović, Nina, Pavlović, Vladimir B., Stojanović, J., Miličić, Lj., Radojević, Zagorka, Ristić, Momčilo M., "Synthesis and sintering of high-temperature composites based on mechanically activated fly ash" in Science of Sintering, 44, no. 2 (2012):135-146,
https://doi.org/10.2298/SOS1202135T .,
https://hdl.handle.net/21.15107/rcub_dais_193 .

TY  - CONF
AU  - Terzić, Anja
AU  - Pavlović, Ljubica
AU  - Aćimović Pavlović, Zagorka
AU  - Obradović, Nina
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/762
AB  - Concretes whose structure and final properties are shaped during thermal pre-treatment or during life-service at elevated temperatures can be applied as construction material for thermal insulation and/or refractory linings in high-temperatureoperating plants. Refractory concretes designed with waste raw materials show satisfying performances in comparison with standard concretes. Sintering initiates microstructural changes within concrete. Concrete microstructure further develops with increasing temperature. Change progression can be monitored by means of destructive and non-destructive tests: either by investigating change of compressive strength or apparent porosity of concrete samples. Destructive tests, in this study, were applied in compressive strength investigation, while non-destructive tests were performed for results comparison. Experiment has been conducted on corundum (standard) concrete and recycled bauxite (experimental) concrete. Samples underwent thermal treatment from 110 to 1500°C. Macroperformance of the final refractory concrete was correlated to the microstructural change detected by means of XRD and SEM analysis. Creep testing was conducted to prove sintering process. Results showed that recycled concrete has equal if not better properties in comparison with standard refractory concrete and can be used as thermoinsulation or refractory material. The results presented in this paper contribute to the idea of including other testing methods (i.e. nondestructive methods) in investigation of microstructural changes and sintering process of refractory concrete. At the same time results of this investigation highlight advantages of application of secondary raw materials in design of refractory materials. Although recycled aggregate concrete showed lower compressive strength and higher porosity than commercial concrete it should be noted that both porosity and compressive strength are within satisfying value range for high-temperature application, i.e. these concretes will not be used as structural materials but as thermal insulation linings. In such application refractoriness is the property which is more important than strength. Considering the fact that compressive strength is above 50 MPa (and above 20 MPa at 1500°c) these concretes should be able to withstand load induced by other constructive parts of furnace and slag. Refractoriness test showed that bauxite-based recycled concrete is highly resistible on increasing temperatures and creep test showed initiation of sintering process. Corundum concrete can be used for temperature above 1500°c. Due to the satisfying performances it is concluded that recycled concrete can be equally used as standard concrete. Even though it has slightly lower properties, accent should be on the financial and ecological benefit found in using of recycled material and savings of energy and natural resources.
PB  - Kiev : National Academy of Sciences of Ukraine (NASU); Frantsevych Institute for Problems of Materials Science of NASU; National Technical University of Ukraine "KPI"; Ukrainian Materials Science Society; INTEM LTD
C3  - 3rd International Samsonov Memorial Conference “Materials Science of Refractory Compounds", May 23-25, Ukraine: Conference Abstracts
T1  - Microstructural changes initiated by sintering of refractory concrete based on recycled bauxite aggregate
SP  - 73
EP  - 73
UR  - https://hdl.handle.net/21.15107/rcub_dais_762
ER  - 

@conference{
author = "Terzić, Anja and Pavlović, Ljubica and Aćimović Pavlović, Zagorka and Obradović, Nina",
year = "2012",
abstract = "Concretes whose structure and final properties are shaped during thermal pre-treatment or during life-service at elevated temperatures can be applied as construction material for thermal insulation and/or refractory linings in high-temperatureoperating plants. Refractory concretes designed with waste raw materials show satisfying performances in comparison with standard concretes. Sintering initiates microstructural changes within concrete. Concrete microstructure further develops with increasing temperature. Change progression can be monitored by means of destructive and non-destructive tests: either by investigating change of compressive strength or apparent porosity of concrete samples. Destructive tests, in this study, were applied in compressive strength investigation, while non-destructive tests were performed for results comparison. Experiment has been conducted on corundum (standard) concrete and recycled bauxite (experimental) concrete. Samples underwent thermal treatment from 110 to 1500°C. Macroperformance of the final refractory concrete was correlated to the microstructural change detected by means of XRD and SEM analysis. Creep testing was conducted to prove sintering process. Results showed that recycled concrete has equal if not better properties in comparison with standard refractory concrete and can be used as thermoinsulation or refractory material. The results presented in this paper contribute to the idea of including other testing methods (i.e. nondestructive methods) in investigation of microstructural changes and sintering process of refractory concrete. At the same time results of this investigation highlight advantages of application of secondary raw materials in design of refractory materials. Although recycled aggregate concrete showed lower compressive strength and higher porosity than commercial concrete it should be noted that both porosity and compressive strength are within satisfying value range for high-temperature application, i.e. these concretes will not be used as structural materials but as thermal insulation linings. In such application refractoriness is the property which is more important than strength. Considering the fact that compressive strength is above 50 MPa (and above 20 MPa at 1500°c) these concretes should be able to withstand load induced by other constructive parts of furnace and slag. Refractoriness test showed that bauxite-based recycled concrete is highly resistible on increasing temperatures and creep test showed initiation of sintering process. Corundum concrete can be used for temperature above 1500°c. Due to the satisfying performances it is concluded that recycled concrete can be equally used as standard concrete. Even though it has slightly lower properties, accent should be on the financial and ecological benefit found in using of recycled material and savings of energy and natural resources.",
publisher = "Kiev : National Academy of Sciences of Ukraine (NASU); Frantsevych Institute for Problems of Materials Science of NASU; National Technical University of Ukraine "KPI"; Ukrainian Materials Science Society; INTEM LTD",
journal = "3rd International Samsonov Memorial Conference “Materials Science of Refractory Compounds", May 23-25, Ukraine: Conference Abstracts",
title = "Microstructural changes initiated by sintering of refractory concrete based on recycled bauxite aggregate",
pages = "73-73",
url = "https://hdl.handle.net/21.15107/rcub_dais_762"
}

Terzić, A., Pavlović, L., Aćimović Pavlović, Z.,& Obradović, N.. (2012). Microstructural changes initiated by sintering of refractory concrete based on recycled bauxite aggregate. in 3rd International Samsonov Memorial Conference “Materials Science of Refractory Compounds", May 23-25, Ukraine: Conference Abstracts
Kiev : National Academy of Sciences of Ukraine (NASU); Frantsevych Institute for Problems of Materials Science of NASU; National Technical University of Ukraine "KPI"; Ukrainian Materials Science Society; INTEM LTD., 73-73.
https://hdl.handle.net/21.15107/rcub_dais_762

Terzić A, Pavlović L, Aćimović Pavlović Z, Obradović N. Microstructural changes initiated by sintering of refractory concrete based on recycled bauxite aggregate. in 3rd International Samsonov Memorial Conference “Materials Science of Refractory Compounds", May 23-25, Ukraine: Conference Abstracts. 2012;:73-73.
https://hdl.handle.net/21.15107/rcub_dais_762 .

Terzić, Anja, Pavlović, Ljubica, Aćimović Pavlović, Zagorka, Obradović, Nina, "Microstructural changes initiated by sintering of refractory concrete based on recycled bauxite aggregate" in 3rd International Samsonov Memorial Conference “Materials Science of Refractory Compounds", May 23-25, Ukraine: Conference Abstracts (2012):73-73,
https://hdl.handle.net/21.15107/rcub_dais_762 .

TY  - CONF
AU  - Terzić, Anja
AU  - Pavlović, Ljubica
AU  - Obradović, Nina
AU  - Pavlović, Vladimir B.
AU  - Radojević, Zagorka
AU  - Miličić, Ljiljana
AU  - Aćimović Pavlović, Zagorka
PY  - 2012
UR  - https://dais.sanu.ac.rs/123456789/532
AB  - The aim of the presented study is to evaluate utilization potential of the fly ash which is the main residue from the coal combustion thermal-plants. Decades long high production of fly ash represents extreme hazard for the environment. The storage problem of this waste material is also alerting. Thus, recycling and reapplication of fly ash in construction materials industry is the only economic solution. The well-known examples of fly-ash reapplication as a component in cement, mortar, concrete, bricks and tiles are not enough in means of reusing extreme amounts of this waste material. Therefore, new applications in ash-based composites have to be developed: eco-ceramic materials and sintered materials for refractory performances. In this investigation, characterization of three different fly ash capacities was used as base for further fly ash utilization possibilities analysis. Accent was on the investigation of the fly ash mineralogical and chemical composition. Thermal stability of crystalline phases was investigated with DTA. Macro-performance was correlated with the microstructure of fly ash studied by means of XRD and SEM analysis. Furthermore, content of trace elements, physico-chemical characteristics and leaching toxicity tests were carried out. Comparing the properties of investigated fly ashes with standard values, it could be presumed that fly ash originating from Serbian power plants can be potentially useful for high value products - eco-ceramic and refractory/sintered materials manufacturing. Key words: fly ash, microstructure, potential reusing, eco-ceramic, sintering.
Acknowledgements: This investigation was supported by Serbian Ministry of Science and Education and it was conducted under following projects: 172057 and 45008.
PB  - Belgrade : Serbian Ceramic Society
C3  - The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts
T1  - Evaluation of Fly Ash Pysico-chemical Characteristics as Component for Eco-ceramic and Sintered Materials
SP  - 32
EP  - 32
UR  - https://hdl.handle.net/21.15107/rcub_dais_532
ER  - 

@conference{
author = "Terzić, Anja and Pavlović, Ljubica and Obradović, Nina and Pavlović, Vladimir B. and Radojević, Zagorka and Miličić, Ljiljana and Aćimović Pavlović, Zagorka",
year = "2012",
abstract = "The aim of the presented study is to evaluate utilization potential of the fly ash which is the main residue from the coal combustion thermal-plants. Decades long high production of fly ash represents extreme hazard for the environment. The storage problem of this waste material is also alerting. Thus, recycling and reapplication of fly ash in construction materials industry is the only economic solution. The well-known examples of fly-ash reapplication as a component in cement, mortar, concrete, bricks and tiles are not enough in means of reusing extreme amounts of this waste material. Therefore, new applications in ash-based composites have to be developed: eco-ceramic materials and sintered materials for refractory performances. In this investigation, characterization of three different fly ash capacities was used as base for further fly ash utilization possibilities analysis. Accent was on the investigation of the fly ash mineralogical and chemical composition. Thermal stability of crystalline phases was investigated with DTA. Macro-performance was correlated with the microstructure of fly ash studied by means of XRD and SEM analysis. Furthermore, content of trace elements, physico-chemical characteristics and leaching toxicity tests were carried out. Comparing the properties of investigated fly ashes with standard values, it could be presumed that fly ash originating from Serbian power plants can be potentially useful for high value products - eco-ceramic and refractory/sintered materials manufacturing. Key words: fly ash, microstructure, potential reusing, eco-ceramic, sintering.
Acknowledgements: This investigation was supported by Serbian Ministry of Science and Education and it was conducted under following projects: 172057 and 45008.",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts",
title = "Evaluation of Fly Ash Pysico-chemical Characteristics as Component for Eco-ceramic and Sintered Materials",
pages = "32-32",
url = "https://hdl.handle.net/21.15107/rcub_dais_532"
}

Terzić, A., Pavlović, L., Obradović, N., Pavlović, V. B., Radojević, Z., Miličić, L.,& Aćimović Pavlović, Z.. (2012). Evaluation of Fly Ash Pysico-chemical Characteristics as Component for Eco-ceramic and Sintered Materials. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts
Belgrade : Serbian Ceramic Society., 32-32.
https://hdl.handle.net/21.15107/rcub_dais_532

Terzić A, Pavlović L, Obradović N, Pavlović VB, Radojević Z, Miličić L, Aćimović Pavlović Z. Evaluation of Fly Ash Pysico-chemical Characteristics as Component for Eco-ceramic and Sintered Materials. in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts. 2012;:32-32.
https://hdl.handle.net/21.15107/rcub_dais_532 .

Terzić, Anja, Pavlović, Ljubica, Obradović, Nina, Pavlović, Vladimir B., Radojević, Zagorka, Miličić, Ljiljana, Aćimović Pavlović, Zagorka, "Evaluation of Fly Ash Pysico-chemical Characteristics as Component for Eco-ceramic and Sintered Materials" in The First Serbian Ceramic Society Conference "Advanced Ceramics and Application" May 10-11, 2012: Program and the Book of Abstracts (2012):32-32,
https://hdl.handle.net/21.15107/rcub_dais_532 .

TY  - CONF
AU  - Obradović, Nina
AU  - Terzić, Anja
AU  - Pavlović, Ljubica
AU  - Filipović, Suzana
AU  - Pavlović, Vladimir B.
PY  - 2011
UR  - https://dais.sanu.ac.rs/123456789/635
AB  - The base mix refractory concrete is corundum based, containing corundum as refractory aggregate and CAC as hydraulic binder, with spinel as an additive. The authors investigated the dehydration reactions which occur from the moment when water is added (at the beginning of components mixing), to the moment when installed refractory concrete lining is put into the service. Sintering process kinetic of low-cement content refractory concrete was investigated by means of differential thermal analysis (DTA) at three different heating rates (10, 20 and 30 •C/min). Thus, temperature was increased from 20 to 1100 •C. Activation energy during sintering process was determined by Kissinger method. Obtained values of activation energies were: 90.576 kJ/mol; 140.972 kJ/mol and 148.447 kJ/mol for TI, T2 and T3, respectively.
PB  - Craiova
C3  - Book of abstracts / CEEC-TACI : 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry 7-10 September 2011, Craiova, Romania
T1  - Dehydration kinetics investigation of refractory concrete during sintering using DTA method
SP  - 45
EP  - 45
UR  - https://hdl.handle.net/21.15107/rcub_dais_635
ER  - 

@conference{
author = "Obradović, Nina and Terzić, Anja and Pavlović, Ljubica and Filipović, Suzana and Pavlović, Vladimir B.",
year = "2011",
abstract = "The base mix refractory concrete is corundum based, containing corundum as refractory aggregate and CAC as hydraulic binder, with spinel as an additive. The authors investigated the dehydration reactions which occur from the moment when water is added (at the beginning of components mixing), to the moment when installed refractory concrete lining is put into the service. Sintering process kinetic of low-cement content refractory concrete was investigated by means of differential thermal analysis (DTA) at three different heating rates (10, 20 and 30 •C/min). Thus, temperature was increased from 20 to 1100 •C. Activation energy during sintering process was determined by Kissinger method. Obtained values of activation energies were: 90.576 kJ/mol; 140.972 kJ/mol and 148.447 kJ/mol for TI, T2 and T3, respectively.",
publisher = "Craiova",
journal = "Book of abstracts / CEEC-TACI : 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry 7-10 September 2011, Craiova, Romania",
title = "Dehydration kinetics investigation of refractory concrete during sintering using DTA method",
pages = "45-45",
url = "https://hdl.handle.net/21.15107/rcub_dais_635"
}

Obradović, N., Terzić, A., Pavlović, L., Filipović, S.,& Pavlović, V. B.. (2011). Dehydration kinetics investigation of refractory concrete during sintering using DTA method. in Book of abstracts / CEEC-TACI : 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry 7-10 September 2011, Craiova, Romania
Craiova., 45-45.
https://hdl.handle.net/21.15107/rcub_dais_635

Obradović N, Terzić A, Pavlović L, Filipović S, Pavlović VB. Dehydration kinetics investigation of refractory concrete during sintering using DTA method. in Book of abstracts / CEEC-TACI : 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry 7-10 September 2011, Craiova, Romania. 2011;:45-45.
https://hdl.handle.net/21.15107/rcub_dais_635 .

Obradović, Nina, Terzić, Anja, Pavlović, Ljubica, Filipović, Suzana, Pavlović, Vladimir B., "Dehydration kinetics investigation of refractory concrete during sintering using DTA method" in Book of abstracts / CEEC-TACI : 1st Central and Eastern European Conference on Thermal Analysis and Calorimetry 7-10 September 2011, Craiova, Romania (2011):45-45,
https://hdl.handle.net/21.15107/rcub_dais_635 .