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Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins

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2018
j.conbuildmat.2018.05.144.pdf (2.847Mb)
Authors
Ilić, Biljana
Mitrović, Aleksandra
Miličić, Ljiljana
Zdujić, Miodrag
Article (Accepted Version)
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Abstract
The effects of two different mechanically activated kaolins, AKV (61% kaolinite, 14% quartz and 16% mica) and AKG (51.6% kaolinite and 40.6% quartz) on the compressive strength of cement composites and microstructure of pastes were investigated. Composite mixtures, in which 10, 20, 30, 40 and 50% of ordinary Portland cement (OPC) was replaced by AKV or AKG, were prepared with w/b of 0.5, and exposed to different curing conditions (ordinary curing for 28 days and autoclaving). Factors affecting microstructure were investigated on pastes by X-ray diffraction (XRD), Differential thermal analysis/thermal gravimetry (DTA/TG) analyses, Mercury intrusion porosimetry (MIP) and Scanning electron microscopy with Energy-dispersive spectroscopy (SEM-EDS). AKG composites exhibited higher compressive strengths under both curing conditions. Positive autoclaving effects on strengths were predominantly pronounced at the higher cement replacement levels. Comparison of the autoclaved and ordinary cured p...aste microstructure, revealed more intensive pozzolanic reaction during autoclaving conditions (CH content near zero) and higher total porosity. The negative effect of hydrogarnet on the strength was compensated by the formation of the crystalline tobermorite. Obtained results revealed that mechanically activated kaolin, with high content of quartz, could be a promising pozzolanic addition, even at high cement replacement levels (30–50%), especially when autoclaving curing conditions were applied. © 2018 Elsevier Ltd

Keywords:
microstructure / cement-based composites / autoclave curing / mechanically activated kaolin / ordinary curing
Source:
Construction and Building Materials, 2018, 178, 92-101
Publisher:
  • Elsevier
Funding / projects:
  • Utilization of by-products and recycled waste materials in concrete composites in the scope of sustainable construction development in Serbia: investigation and environmental assessment of possible applications (RS-36017)
  • Nanostructured Functional and Composite Materials in Catalytic and Sorption Processes (RS-45001)

DOI: 10.1016/j.conbuildmat.2018.05.144

ISSN: 0950-0618

WoS: 000437076700010

Scopus: 2-s2.0-85048722273
[ Google Scholar ]
15
6
Handle
https://hdl.handle.net/21.15107/rcub_dais_4512
URI
https://dais.sanu.ac.rs/123456789/4512
Collections
  • ИТН САНУ - Општа колекција / ITS SASA - General collection
Institution/Community
Институт техничких наука САНУ / Institute of Technical Sciences of SASA
TY  - JOUR
AU  - Ilić, Biljana
AU  - Mitrović, Aleksandra
AU  - Miličić, Ljiljana
AU  - Zdujić, Miodrag
PY  - 2018
UR  - https://dais.sanu.ac.rs/123456789/4512
AB  - The effects of two different mechanically activated kaolins, AKV (61% kaolinite, 14% quartz and 16% mica) and AKG (51.6% kaolinite and 40.6% quartz) on the compressive strength of cement composites and microstructure of pastes were investigated. Composite mixtures, in which 10, 20, 30, 40 and 50% of ordinary Portland cement (OPC) was replaced by AKV or AKG, were prepared with w/b of 0.5, and exposed to different curing conditions (ordinary curing for 28 days and autoclaving). Factors affecting microstructure were investigated on pastes by X-ray diffraction (XRD), Differential thermal analysis/thermal gravimetry (DTA/TG) analyses, Mercury intrusion porosimetry (MIP) and Scanning electron microscopy with Energy-dispersive spectroscopy (SEM-EDS). AKG composites exhibited higher compressive strengths under both curing conditions. Positive autoclaving effects on strengths were predominantly pronounced at the higher cement replacement levels. Comparison of the autoclaved and ordinary cured paste microstructure, revealed more intensive pozzolanic reaction during autoclaving conditions (CH content near zero) and higher total porosity. The negative effect of hydrogarnet on the strength was compensated by the formation of the crystalline tobermorite. Obtained results revealed that mechanically activated kaolin, with high content of quartz, could be a promising pozzolanic addition, even at high cement replacement levels (30–50%), especially when autoclaving curing conditions were applied. © 2018 Elsevier Ltd
PB  - Elsevier
T2  - Construction and Building Materials
T1  - Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins
SP  - 92
EP  - 101
VL  - 178
DO  - 10.1016/j.conbuildmat.2018.05.144
UR  - https://hdl.handle.net/21.15107/rcub_dais_4512
ER  - 
@article{
author = "Ilić, Biljana and Mitrović, Aleksandra and Miličić, Ljiljana and Zdujić, Miodrag",
year = "2018",
abstract = "The effects of two different mechanically activated kaolins, AKV (61% kaolinite, 14% quartz and 16% mica) and AKG (51.6% kaolinite and 40.6% quartz) on the compressive strength of cement composites and microstructure of pastes were investigated. Composite mixtures, in which 10, 20, 30, 40 and 50% of ordinary Portland cement (OPC) was replaced by AKV or AKG, were prepared with w/b of 0.5, and exposed to different curing conditions (ordinary curing for 28 days and autoclaving). Factors affecting microstructure were investigated on pastes by X-ray diffraction (XRD), Differential thermal analysis/thermal gravimetry (DTA/TG) analyses, Mercury intrusion porosimetry (MIP) and Scanning electron microscopy with Energy-dispersive spectroscopy (SEM-EDS). AKG composites exhibited higher compressive strengths under both curing conditions. Positive autoclaving effects on strengths were predominantly pronounced at the higher cement replacement levels. Comparison of the autoclaved and ordinary cured paste microstructure, revealed more intensive pozzolanic reaction during autoclaving conditions (CH content near zero) and higher total porosity. The negative effect of hydrogarnet on the strength was compensated by the formation of the crystalline tobermorite. Obtained results revealed that mechanically activated kaolin, with high content of quartz, could be a promising pozzolanic addition, even at high cement replacement levels (30–50%), especially when autoclaving curing conditions were applied. © 2018 Elsevier Ltd",
publisher = "Elsevier",
journal = "Construction and Building Materials",
title = "Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins",
pages = "92-101",
volume = "178",
doi = "10.1016/j.conbuildmat.2018.05.144",
url = "https://hdl.handle.net/21.15107/rcub_dais_4512"
}
Ilić, B., Mitrović, A., Miličić, L.,& Zdujić, M.. (2018). Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins. in Construction and Building Materials
Elsevier., 178, 92-101.
https://doi.org/10.1016/j.conbuildmat.2018.05.144
https://hdl.handle.net/21.15107/rcub_dais_4512
Ilić B, Mitrović A, Miličić L, Zdujić M. Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins. in Construction and Building Materials. 2018;178:92-101.
doi:10.1016/j.conbuildmat.2018.05.144
https://hdl.handle.net/21.15107/rcub_dais_4512 .
Ilić, Biljana, Mitrović, Aleksandra, Miličić, Ljiljana, Zdujić, Miodrag, "Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins" in Construction and Building Materials, 178 (2018):92-101,
https://doi.org/10.1016/j.conbuildmat.2018.05.144 .,
https://hdl.handle.net/21.15107/rcub_dais_4512 .

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