Regulation of Foam Stability for Non-autoclave Foam Concrete with Additives of Colloidal Nature

Abstract

AbstractPractice shows that the performance of foamed concrete is influenced by the properties of the injected foam, including its stability. It was proposed to regulate the stability of the foam, additives of colloidal nature - silicic acid and iron (III) hydroxide sols. The choice of these additives is due to the intended hardening of the foam films through the interaction of the dispersed phase of the ashes with the blowing agent particles. The stability of the foam, including in the cement batter, depending on the quantitative content of these additives was investigated. X-ray phase and derivatographic analyses of D600 foam concrete samples were carried out to evaluate the effect of ashes on hydration processes. The pore structure of D600 foam concrete with silicic acid sol has been investigated by electron microscopy. It was found that the introduction of ash into the foaming agent solution has an effect on the macroporosity of foam concrete: the average pore diameter is reduced and the number of pores with diameters corresponding to the average pore diameter is increased. It has been shown that in the presence of silicic acid sol the foam film thickness separating the air pore from the cement stone in foamed concrete increases significantly. KeywordsFoam stabilityFoam stability coefficient in cement testSilicic acid saltIron (III) hydroxide salt