Keywords: hardening kinetics

THE JOINT INFLUENCE OF SUCCAROSE AND HIGHLY DISPERSED CALCIUM HYDROSILICATES ON THE STRENGTH DEVELOPMENT KINETICS OF CEMENT CONCRETE

Abstract
Сement hydration accelerator (highly dispersed calcium hydrosilicates) and hydration retarder (sucrose) are components of calcium silicate dispersion (CSD). Their joint influence on the processes of setting and hardening of cement composites is considered. The content of 10% CSD in the composition of the composite binder (CB) leads to a shift of the thermal maximum on the thermokinetic curve by a day. At the same time, at the late stages of hydration (>70 hours), the heat release rate remains consistently high, it is 2-3 times higher than the heat release rate of the control sample. The setting kinetics of CB pastes depends on the content of CSD in its composition and is of an extreme nature. The effectiveness of CSD in the composition of CB was evaluated on the example of ordinary heavy concrete (B25) with the replacement of cement with CSD. The results of assessing the change in the strength of concrete at CB are supplemented with calculated strength indicators in the future up to 1800 days hardening. The expected compressive strength of concrete samples on a composite binder is 1.8 times higher than the strength of the control sample.
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