Pryanishnikov A. High performance concrete for massive constructions building

Object - a process of directed regulation of strength formation and heat dissipation highly functional concrete projected composition and prediction of the stresses arising in the array. Item - highly functional for the construction of massive concrete structures. The Subject - physical and mechanical, physical, chemical, computer modeling to calculate temperature fields and the internal stresses in the array. Novelty - theoretically substantiated and experimentally confirmed the participation of calcium carbonate in the creation of additional favorable conditions for slowing the heat of cement due to the formation of calcium calcium carbo-aluminates hydrates on the mechanism of formation of ettringite, providing chemically related substrates for the formation of calcium hydro, as well as reduced shrinkage effects due to compaction hardening of the system; proposed a new criterion for evaluating the effectiveness of highly functional concrete designed to build massive structures such as the ratio between the indicators of its strength and exothermic - constructive heat coefficient (Kkt); revealed patterns of change in Kkt, depending on the nature and concentration of mineral additives in cement, the type and structural features of superplasticizer and proven efficiency on such parameter cements containing limestone in concrete for massive structures; provided an estimates thermal stresses state plasticized concrete based on cement with the addition of limestone in the array design taking into account the conditions of his concreting. The Results - tested the economic feasibility of production and use in the construction of a massive concrete structure of the projected due to the possibility of reducing costs to 45.1 UAH per 1 m3 laid concrete as by reducing the cost of concrete,and improving the technology of concreting. Industry - construction.