INVESTIGATION OF THE EFFECT OF THE FOAMING AGENT ON THE HARDENING PROCESSES OF CEMENT STONE

Abstract

Data analysis shows that with a low consumption of foaming agent, an increase in the strength of cement stone is observed, and with a high consumption, a decrease in strength occurs. The maximum strength is achieved with the consumption of a bioPAV additive of 0.4%, and "Neopor" 0.6% of the cement weight, it increases by 5%. Some initial slowdown in cement hydration and hardening of cement stone is compensated already at the age of 1-3 days. The decrease in strength with a high content of foaming agent is due to a slowdown in cement hydration and a slowdown in the structure formation of cement stone. With a large consumption of foaming agent in the mixture, the content of low molecular weight substances reaches such an amount that the hydration of cement slows down significantly.The study shows that the degree of hydration of cement depends on the amount of surfactant. It was found that the concentration of the foaming additive mainly affects the quantitative phase composition of the cement stone. The qualitative composition of the hydrate phases remains constant regardless of the additive content. At elevated concentrations, surfactant molecules are adsorbed on the surface of the grains of the initial cement and the resulting hydrate phases, which is accompanied by a slowdown in cement hydration