Hydro-Physical Properties of the Coating for the Walls of Aerated Concrete

The work is devoted to the development of formulations for heat-insulating dry building mixtures, using which it is possible to obtain coatings characterized by low vapor permeability resistance, high heat transfer resistance and high water resistance. The type of filler used has a significant impact on these properties. In the course of the research, the hydro-physical properties of coatings obtained using various highly porous fillers were compared: hollow glass microspheres, ash aluminosilicate microspheres, expanded vermiculite and perlite sand. It was found that when using fillers based on microspheres, coatings were obtained that are characterized by high closed porosity, reaching 40.0–56.9%, depending on the type of microspheres. When using expanded vermiculite and perlite sand, the closed porosity is much lower and does not exceed 24.7–27.5%. Because of this, the use of microspheres in the composition of the developed dry building mixtures resulted in coatings characterized by higher water resistance compared to coatings obtained using other porous fillers. It has been established that coatings based on heat-insulating dry building mixtures. Obtained using microspheres are characterized by good frost resistance and high ability to withstand the effects of slanting rains.