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The effect of the physical state of chemical additives at the time of introduction into a gas-concrete mixture on the kinetics of gas evolution and the gas diffusion coefficient

Abstract

The effect of the physical state of chemical additives at the time of introduction into a gas-concrete mixture on the kinetics of gas evolution and the gas diffusion coefficient

Shujskij A.I., Stelmakh S.A., Shcherban E.M., Khalyushev A.K., Kholodnjak M.G., Nazhuev M.P.

Incoming article date: 30.07.2017

"n this article, the influence of the physical state of chemical additives at the moment of their introduction into a gas-concrete mixture on the kinetics of gas evolution and the gas diffusion coefficient is considered. To test the working hypothesis, two compounds were designed and manufactured. As a part of С№1 chemical additives were entered in the form of a colloidal solution. A comparative analysis of the results of physical and mechanical tests of the aerated concrete samples of the tested compositions showed that the introduction of chemical additives in the form of a colloidal solution lowers the average density in the dry state due to a more intensive course of the gas evolution reaction without significantly reducing the compressive strength. At the same time, the average density increases in the composition of CN2.

Keywords: kinetics of gas evolution, gas diffusion coefficient, aerated concrete mixture, reactivity, expansion of aerated concrete mixture, colloidal solution