Fast-hardening, high-strength and frost resistant concrete based on slag portland cement

It is known that concretes based on slag portland cement (SPC) are distinguished by high environmental and economic indicators, as well as increased durability in almost all operational environments. But many researchers, technologists and the provisions of standards, argue that it is impossible to obtain fast-hardening and high-strength concretes, as well as concretes with high frost resistance using SPC. In this article, comprehensive measures aimed at effectively improving the mentioned characteristics have been proposed. The research results show that at a low water-cement ratio, slag portland cement, which contains ground granulated blast-furnace slag and mineral additives, is able to quickly harden under normal conditions, gain high strength and form the structure of a cement stone of concrete with low open porosity, that provides high frost resistance. As a result, a fast-hardening concrete of compressive strength class B55 and frost resistance grade of F2 400 (F1 1000) has been developed. Other characteristics of the concrete have also been evaluated: axial tensile strength class - Bt 3.6; flexural tensile strength class - Btb 6.4; abrasion grade - G1 and watertightness grade - W16.