FIELD: manufacture of building materials. SUBSTANCE: composition for manufacturing spherical porous aggregate for concretes with average clump density 22-50 kg/cu.m contains liquid glass with density 1,45-1.51 g/cu.cm and sodium chloride in amounts 4.5 to 50% of the weight of liquid glass. EFFECT: ensured sufficient strength at specified shape and dimensions. 1 tbl
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