Abstract
The influence of complex additives on the kinetics of cement exothermia and the stage of cement hydration at hardening of heavy concrete in industrial conditions has been studied. It is established that in heavy concrete B35 with the use of cement CEM I 42.5 N SS with complex admixture maximum temperature of hydration - 79.0 ° C reaches 26 hours 30 minutes after pouring and preservation of maximum temperature within 78.0-79.0 ° C continues for 9 hours. Complex additives significantly increase the degree of hydration of cement. At the same time, the initial hardening time is 4-4.5 % and 28 day hardening age is up to 15 %. It is established that the introduction of complex additive in the cement composition of CEM I 42.5 N SS promotes the formation of smaller and mostly oriented secondary crystals of Portlandite. The considered complex additives consisting of the active mineral additive (wastes of enrichment of polymetallic ores), nanofiller (microsilica) and chemical additives (master air 200 and master rheobuid 1000) changing speed of hydration and time of achievement of the maximum temperature index, define the periods of hydrate formation.
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