Abstract
The evolution of the chemical composition of the liquid phase of class G cement pastes has been followed from mixing up to the beginning of setting. A computer program which simulates multicomponent chemical equilibria in aqueous media was used to interpret these data in terms of saturation factors with respect to gypsum and portlandite. The influence of sulphate on the composition of cement supernatants as a function of hydration time has been studied using sulphates from different sources. A tentative relationship between the concentrations of the major ions is proposed.
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