Influence of the origin of metakaolin on pozzolanic reactivity of mortars

In this study, Three MK issued from three different regions in Algeria were tested. The regions are, Jijel, Gulema and Béchar. This study aims to investigate the effects of the origin of MK blended at early age. The chemical and minalorgiques analysis (XRD, BET, SSB and SEM) show a difference in their metakaolinite content. One mortar prepared with 15% substitution rates of cement with different MK. The early-age reactivity of metakaolin-blended cement mortar was investigated. Isothermal calorimetry and compressive strength tests were performed. The hydration rate and the evolution of Ca(OH)2 content of mortars were monitored using thermogravimetric analysis (ATG). The early age reactivity of the three MKs is very different.