Influence of Chemical Composition on Hydration of Low Silica Containing Calcium Aluminate Glasses

Abstract

The hydration process of low silica containing calcium aluminate glasses in high-alumina cement was studied. The glasses with the compositions; SiO₂ 0-15%, CaO 25-50%, Al₂O₃ 45-60%, were prepared by fusion and quenching in water. The mechanism of the hydration varied discontinuously in the above composition range. The ratio of CaO to Al₂O₃ in glass seems to determine the mechanism of hydration process of low silica containing calcium aluminate glass. The hydration process of calcium aluminate glasses studied was classified into several types, in view of similarity of the hydration process of crystalline calcium aluminate (12CaO⋅7Al₂O₃, CaO⋅Al₂O₃, CaO⋅2Al₂O₃).