FIELD: building materials. SUBSTANCE: invention relates to composites of complex additions used in production concrete and ferroconcrete articles and constructions. The complex addition for concrete and solute mixture containing potassium chromate involves additionally sulfur and lime in the following ratio of components, dry wt.-%: potassium chromate, 40.0-60.0; sulfur, 26.0-39.0; lime, 14.0- -21.0. EFFECT: enhanced compression strength of concrete. 2 tbl, 1 ex
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