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Lightweight Mortars Based on Expanded Perlite

Lightweight mortars composed from a lime-metakaolin binder or lime-cement binder and expanded perlite filler were prepared and tested. Mortar test samples were firstly cured in a humid atmosphere and subsequently in laboratory ambient conditions. Development of hardening processes was studied by X-ray diffraction and thermal analysis. Morphology and microstructure of mortars was observed by SEM. Compressive strength, bulk density, porosity, capillary water absorption and thermal conductivity of mortars were determined in predetermined time periods.