COMPLEX ADDITIVE FOR CONCRETE MIXTURE

FIELD: construction materials, in particular, complex additive compositions for concrete mixtures used for manufacture of concrete and ferroconcrete articles. ^ SUBSTANCE: complex additive for concrete mixture contains water-soluble technical-grade lignosulfonate with electrolyte, said technical-grade lignosulfonate being alkali concentrate of bisulfite cooking of wood with weight part of dry substances of at least 50%, and electrolyte being sodium hydroxide. Said components are used in the following ratio, wt%: alkali concentrate of bisulfite cooking of wood with weight part of dry substances of at least 50% 95-99; 40%-aqueous solution of sodium hydroxide 1-5. ^ EFFECT: increased strength of concrete and motion of concrete mixture, utilization of lignosulfonate containing wastes of cellulose production by bisulfite method to thereby eliminate discharge of these alkalis into basins and, consequently, reduced pollution of environment. ^ 1 tbl