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THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF CEMENTITIOUS MATERIALS COMPRISED OF LIMESTONE, CALCINED CLAY AND CLINKER
- Source :
- Ceramics-Silikáty, Vol 63, Iss 4, Pp 356-364 (2019)
- Publication Year :
- 2019
- Publisher :
- University of Chemistry and Technology, Prague, 2019.
-
Abstract
- Limestone, calcined clay and cement (LC³) are one of the low carbon cement materials which are used as a partial substitution of clinker and Portland cement. In this study, the effects of limestone and calcined clay (LC²) on the mechanical properties and microstructure of mortars were studied under multi-scales. It could be concluded that the compressive strength decreased slightly with an increase in the LC² content, but the flexural strength increased significantly due to the greater formation of crystalline aluminates in the LC³. The x-ray diffraction and thermal analysis results prove the pozzolanic activity of the calcined clay in the LC³ system which is in agreement with the results of the decreasing calcium hydroxide and the increasing ettringite content, and the LC² could reduce the heat of the hydration of the LC³ significantly. Also, the formation of calcium hemicarboaluminate (3CaO.Al₂O₃.Ca[(OH)(CO₃)0.5].xH₂O) and calcium monocarboaluminate (3CaO.Al₂O₃.CaCO₃.xH₂O), as well as the pozzolanic activity of the calcined clay contributed to the development of the mechanical strength.
Details
- Language :
- English
- ISSN :
- 08625468 and 18045847
- Volume :
- 63
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- Ceramics-Silikáty
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.0dd7bb21c78401ab4c579868461ed1d
- Document Type :
- article
- Full Text :
- https://doi.org/10.13168/cs.2019.0031