Metakaolin as a main cement constituent. Exploitation of poor Greek kaolins

摘要: Abstract In this work, the properties and hydration procedure of cements containing metakaolin were monitored for periods up to 180 days. Four metakaolins, derived from poor Greek kaolins, as well a commercial high purity used. Cement mortars pastes, with 0%, 10% 20% replacement cement above examined. Strength development, water demand setting time determined in all samples. addition, XRD TGA applied order study products rate cement–metakaolin pastes. It is concluded that has very positive effect on strength after 2 days specifically at 28 The blended significantly more than relatively pure increase higher, higher content. produced metakaolins one give similar pozzolanic reaction accelerated between 7 days, accompanied by steep decrease Ca(OH) Finally, it content seems be, generally, favorable 20%. impart respect hydration.