Hydration Kinetics Model of Slag-blended Cement System

Abstract

Slag is a fine-grained glassy material formed from molten slag of blast furnace when it is quenched, and it is kind of active admixture. Therefore, the slag as admixtures mixed into cement based materials, whose activity can play a important role in the hydration reaction and improve the mechanical properties of cement based materials. In this paper, the influence of the kinetics of hydration of slag and cement was analyzed, and the dynamics equation of the hydration of slag Portland cement system was established. The influence of slag on slag Portland cement system hydration process was analyzed mainly from the water binder ratio, temperature and the ratio of the influence of slag on slag Portland cement system hydration process. The results show that, the increasing of water binder ratio, temperature increasing and the cement particle specific surface area increasing can accelerate the hydration process of slag Portland cement system in different degree.