Technology for producing foam concrete with predominantly closed porosity

A brief analysis of the causes and stages of development of cellular concrete technologies has shown that the measure of gas porosity closure is one of the most important factors in determining their thermal efficiency and practical applicability. It has been noted that most types of layered building walls currently being constructed are prone to moisture accumulation during their operation, which can lead to negative sanitary and hygienic conditions inside the buildings and a decrease in their thermal efficiency. A comparison of the mass transfer features in two- and one-stage foam concrete mixtures during the homogenization stages revealed a list of reasons that contribute to an increase in the closed porosity in hardened foam concretes in the D400–D800 range. It has been experimentally established that the transition from a two-stage technology for producing foam concrete mixtures to a one-stage technology, by eliminating micelle formation at the stage of predominance of viscous bonds between the raw material components, reduces the volume of communicating pores in equal-density foam concretes by 12–40%. Dispersed reinforcement of such materials further reduces the communicating porosity by several times.