The regularities of the synthesis of calcium hydrosilicates of tobermorite composition in the system "amorphous silica – calcium hydroxide – water" were investigated. The effect of calcium hydrosilicates additive on the hydration processes of Portland cement and the nature of changes in the strength of cement stone at different stages of its hardening was studied. The methods of determining the heat of hydration of cement dough during hardening and X-ray phase analysis showed that the addition of calcium hydrosilicates at the initial stages of hardening accelerates the physicochemical processes of hydration of clinker minerals.
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