Raw bentonite as supplementary cementitious material – a review
Amer Abbas Al-Hammood, Qais J. Frayyeh, Waleed A. Abbas
Abstract
Abstract Bentonite is a type of clay that consists mainly of the montmorillonite mineral when it is finely ground and used as a partial replacement of Portland cement. The result is the low-cost and eco-friendly cementitious binder. Using this binder leads to modify both fresh and hardened properties of cement paste, mortar, and concrete. The desired modifications include; reduce the heat of hydration, reduce the absorption, promote both sulphates and acids resistance; the undesired effects include: increase water demand, reduce setting time, and declination of the mechanical properties. Although raw bentonite may meet the standard requirements for natural pozzolan, it’s considering as a supplementary cementing material that still lacks conclusive evidence.