The results of studies of the porosity of heat-efficient ceramic materials based on clays of various mineralogical composition with a glass-porous component (SPC) and their effect on frost resistance and thermal conductivity are presented. It was found that the content of minerals of the illite and montmorillonite subgroup in clays in compositions with SPC determines the optimal quantitative ratio of meso-, macro-, and also & # 171; hazardous & # 187; reserve and & # 171; safe & # 187; pores, which leads to a decrease in the coefficient of thermal conductivity and high indicators of frost resistance of materials
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