Some Aspects of Influence of Microsilica and Admixtures on Hydration Kinetics of the Alumina Cement “Gorkal-40”

Abstract

The effect of microsilica (in the amount from 7 to 35 % by the mass) and deflocculation admixture on setting and flowability of pastes with the cement “Gorkal-40”, when W/C + S = 0.3 is constant, was investigated. When the amount of microsilica is increased (from 7 to 35 %) the flowability of the paste is decreased, while the addition of deflocculation admixture results in the increased flowability. The setting time is the lowest when the amount of microsilica in the paste is the highest. For the continuous registration of kinetics of hydration process of cement “Gorkal-40” the EXO (exothermic) method was used. The influence of microsilica and deflocculation admixture on the initial EXO effect as well as on the duration of the induction period and the main EXO effect was also established.