this study assesses the kinetics of hydration of pulverised fuel ash and metakaolin cement pastes and compares how the rate of reaction affects the pore-characteristics and resistance to ionic ingress. the degrees of hydration for the different mixtures were evaluated, both as a function of the calcium hydroxide content and with respect to the chemically combined water contents. the reaction ra...

We discuss two fundamental reversible diffusion influenced reactions: ~i! A1B C and ~ii! A 1B C1D. In the pseudo-unimolecular case, we prove that reaction ~i! is a special case of ~ii!, which thus constitutes a unified reversible problem of multiparticle kinetics. For static A and C ~the ‘‘target’’ limit!, we suggest to treat this problem as follows. First we generalize the Smoluchowski theory ...