Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins
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2018
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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
Ključne reči:
autoclave curing / cement-based composites / mechanically activated kaolin / microstructure / ordinary curingIzvor:
Construction and Building Materials, 2018, 178, 92-101Izdavač:
- Elsevier
Finansiranje / projekti:
- Istraživanje mogućnosti primene otpadnih i recikliranih materijala u betonskim kompozitima, sa ocenom uticaja na životnu sredinu, u cilju promocije održivog građevinarstva u srbiji (RS-MESTD-Technological Development (TD or TR)-36017)
- Nanostrukturni funkcionalni i kompozitni materijali u katalitičkim i sorpcionim procesima (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45001)
DOI: 10.1016/j.conbuildmat.2018.05.144
ISSN: 0950-0618
WoS: 000437076700010
Scopus: 2-s2.0-85048722273
Institucija/grupa
Институт техничких наука САНУ / Institute of Technical Sciences of SASATY - JOUR AU - Ilić, Biljana AU - Mitrović, Aleksandra AU - Miličić, Ljiljana AU - Zdujić, Miodrag PY - 2018 UR - https://dais.sanu.ac.rs/123456789/3700 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_3700 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_3700" }
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_3700
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_3700 .
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_3700 .