FIELD: chemistry.
SUBSTANCE: invention relates to construction and industrial construction materials, specifically to making complex additives for mortar and concrete for accelerating hardening of concrete structures. The complex additive contains the following, in wt %: plasticiser S-3 - sodium polymethylene naphthalenesulfonate 87.0-99.8, wood saponified resin 0.1-6.0 and sodium alumomethyl silicate 0.1-7.0 and is a micro-grained additive obtained by spray drying an aqueous solution of its components with particle size not greater than 0.3 mm.
EFFECT: increased strength, reduced water absorption and increased water resistance and frost resistance of concrete mixtures and longevity of concrete.
4 cl, 3 tbl, 4 ex
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