FIELD: manufacture of building materials.
SUBSTANCE: object of invention is to increase stability of foam and to reduce shrinkage of concrete samples. For that, invention provides complex additive comprising hydrochloric and sulfuric acid salts, low-grade lignosulfonates, and, additionally, ethanolamines, said salts, in particular, being calcium, sodium, and potassium chlorides, sodium, potassium, and iron sulfates, and said ethanolamines being triethanolamine or monoethanolamine. Components are used in following proportions, wt %: chlorides 46-43, sulfates 24-31, lignosulfonates 4-8, and ethanolamines 9-15.
EFFECT: improved performance characteristics of concretes.
4 cl, 2 tbl
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