CEMENT

UDC 691.32:691.54

[:en]Smirnov A. O.[:ru]Смирнов А. О.[:] [:en]PhD student, Volga State University of Technology, Yoshkar-Ola, Russia[:ru]аспирант, Поволжский гос. технол. ун-т, г. Йошкар-Ола, Россия[:]

Alitinform №1 (66) 2022 г. 22-30 p.

Abstract

The influence of silica fume and polycarboxylate superplasticizer as a complex organomineral additive on cement hydration, phase composition, and cement stone properties is investigated. It was found that the use of polycarboxylate superplasticizer due to the adsorption of its molecules on clinker minerals inhibits their surface dissolution, which leads to a slowdown in the cement hydration processes at 1 day and a decrease in the early strength of cement stone. The use of silica fume makes it possible to accelerate the clinker minerals hydration and compensate for the plasticizing admixture retarding effect. At 28 days, the combined use of silica fume and polycarboxylate superplasticizer as a complex organomineral additive leads to the formation of a cement stone structure with reduced portlandite content and increased content of amorphized low-basic hydrated calcium silicates densify the cement stone structure and increase its physical and mechanical characteristics.

Key words:

cement stone, silica fume, polycarboxylate superplasticizer, cement hydration, phase composition