INFLUENCE OF HYBRID ADDITIVES FROM INDUSTRIAL WASTE ON THE PHYSICAL AND MECHANICAL PROPERTIES AND STRUCTURE FORMATION OF A “GREEN” CEMENT COMPOSITE

Physical and mechanical properties, hydration rate, phase composition and structure of cement stone depend on many factors, including the presence of various impurities and additives.Moreover, active mineral additives and pozzolans, intensively absorbing Ca(OH)2 released during the hydration of Portland cement, reduce the alkalinity of the liquid phase and thereby accelerate the process of hydrolysis of clinker silicate minerals, and fillers, on the contrary, somewhat slow down both the process of hydration and hardening, and the set of strength of the cement stone, inhibiting the formation of aluminate and silicate hydrate neoplasms, hence the formation of the structure and physical and mechanical properties of the cement stone.This paper presents the results of studies to determine the effect of a hybrid additive, including an active additive in the form of ash and slag waste from thermal power plants, removed by a dry method in a composition with a more passive additive, ultrafine microsilica Ms-85, a waste from the production of silicon alloys.The results of the research showed that the introduction of 25-35% hybrid additives, including 15-25% Ash and slag + 10% microsilica, and due to the formation of a fine-grained structure of the stone of composite Portland cement, do not reduce the strength of Portland cement grade PC400-A0

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