Thermally Activated Bentonite As a Supplementary Cementitious Material – A Review

Bentonite is a mixture of clay and non-clay minerals. Montmorillonite mineral dominant in bentonite. Silica alumina bond the crystal structure montmorillonite. Therefore, they cannot contribute to pozzolanic reaction. Heat treatment bentonite leads destruction montmorillonite converting silica reactive phases. Thermally activated (TAB) relatively low pozzolan when used as partial replacement Portland cement modifies both fresh hardened properties paste, mortar, concrete. The most desired effects TAB are: improve segregation resistance, reduce rate strength gain, enhance concrete durability against sulfates, chlorides, acids, addition economic ecological beneficiations. This paper provides information related heat clays minerals, their on cement.