FIELD: manufacture of building materials. SUBSTANCE: additive contains 61-95% of mixture of ballast salts obtained during desulfurization of coke gas and based on sodium thiosulfate and thiocyanate and organic component, in particular superplasticizer. Additive can be used, in particular, for ferroconcrete items. EFFECT: activated structurization in early curing phases and increased strength and frost resistance of concrete in early curing phases. 1 tbl
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