Mortars Based on a Ternary Binder from Lime, Metakaolin and Calcium Hemihydrate

Abstract:

Normal-weight mortars with quartz sand filler and lightweight mortars with expanded perlite filler were prepared from a lime-metakaolin-gypsum binder. Mortar test samples were cured in a humid atmosphere and also in the laboratory ambient conditions. Development of hardening processes was studied by X-ray diffraction, thermal analysis and SEM-EDS observation. Compressive strength, drying shrinkage, bulk density and thermal conductivity of the mortars were determined. The presence of gypsum binder in the mixtures enabled formation of ettringite that caused expansion and reduced drying shrinkage of mortars with 20% content of gypsum binder.

• Periodical: Key Engineering Materials (Volume 868)
• Pages: 105-118
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.868.105
• Online since: October 2020
• Authors: Vladimír Pavlík*, Alena Struhárová
• Keywords: Calcium Sulfate Hemihydrate, Compressive Strength, DTA, Ettringite, Hemicarboaluminate, Lime, Metakaolin, Monosulfate, Perlite, SEM, Thermal Conductivity, Volume Changes, X-Ray Diffraction

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