INFLUENCE OF REACTION POWDER ON THE POPULAR CONCRETE DENSITY

Abstract

It is determined that the active components of modern concrete are active mineral fillers, such as microsilica, meta-kaolin, ash-bearing or compositions from them, as well as superplasticizers. The optimal combination of these additive modifiers allows you to control the rheological properties of concrete mixtures and to modify the structure of the cement stone in such a way as to provide concrete properties that provide high operational reliability of structures. However, they have certain disadvantages that hamper their widespread use. The purpose of the research is to determine the effect of reaction powders applied simultaneously with colloidal surfactant, on the strength of powdered concrete and the rate of its formation. As a result of the experiments, it was established that the compressive strength of concrete resulting from the hydration of the dispersed system "Portland cement - colloidal surfactant - reaction powder", when used as a reactive powder of melted river sand ash-removal TPP, fine fraction of waste of iron enrichment Ores and blast granular slag above the strength of concrete obtained on the basis of impregnated Portland cement. Thus, the presence in the dispersion of a colloidal surfactant provides increased compressive strength of the resulting concrete. The speed of the set of strength at the compression of concrete, obtained as a result of solidification of the dispersed system, "Portland cement - colloidal surfactant - reaction powder" depends on the type of applied reaction powder. So the highest speed of the set of strength and its finite value are the concrete containing the blend granular slag as a reaction powder. The research and their results have shown that the use of colloidal surfactant leads to an increase in the efficiency of the use of mineral powders obtained, in particular, from waste enrichment of iron ores and blast furnace granulated slag in reactive powder concrete. The most effective reactive powder, which is expedient to use simultaneously with the colloidal surfactant, is blast furnace granulated slag. This means that the use of colloidal surfactant is more effective for the modification of concretes based on slag-portland cement than for concrete in Portland cement.