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

Authorized Users Only
2018
Authors
Ilić, Biljana
Mitrović, Aleksandra
Miličić, Ljiljana
Zdujić, Miodrag
Article (Published 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.

Keywords:
Ordinary curing / Microstructure / Mechanically activated kaolin / Cement-based composites / Autoclave curing
Source:
Construction and Building Materials, 2018, 178, 92-101
Publisher:
  • Elsevier Sci Ltd, Oxford
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 ]
18
6
URI
http://rims.institutims.rs/handle/123456789/347
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
Institut za ispitivanje materijala
TY  - JOUR
AU  - Ilić, Biljana
AU  - Mitrović, Aleksandra
AU  - Miličić, Ljiljana
AU  - Zdujić, Miodrag
PY  - 2018
UR  - http://rims.institutims.rs/handle/123456789/347
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.
PB  - Elsevier Sci Ltd, Oxford
T2  - Construction and Building Materials
T1  - Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins
EP  - 101
SP  - 92
VL  - 178
DO  - 10.1016/j.conbuildmat.2018.05.144
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.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Construction and Building Materials",
title = "Compressive strength and microstructure of ordinary cured and autoclaved cement-based composites with mechanically activated kaolins",
pages = "101-92",
volume = "178",
doi = "10.1016/j.conbuildmat.2018.05.144"
}
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 Sci Ltd, Oxford., 178, 92-101.
https://doi.org/10.1016/j.conbuildmat.2018.05.144
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 .
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 . .

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