FIELD: building materials industry, more particularly manufacture of concrete and reinforced concrete products and structures. SUBSTANCE: additive comprises, wt.%: waste from gas coke plants based on rodanite and sodium thiosulfate, 44.0-62.0; industrial lignosulfonate, 12.5-17.5; sodium salt of benzosulfoacid, 5.5-8.5; sulfur, 13.0-19.5; lime, 7.0-10.5; and water, the balance. EFFECT: increased strength of concrete and mortar mixes. 2 tbl
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