FIELD: manufacture of building materials. SUBSTANCE: additive contains, wt %: sodium nitrate, 213.3-25.5; sodium carbonate, 26.7-28.0; sodium sulfate, 30.0-33.0; calcium chloride, 2.5-3.3; calcium carbide, 8.5-13.3; calcium hydroxide, 2.5-3.3. characteristics of concrete with additive: compression strength at 28-day age 58 MPa, rupture strength 7.2 MPa, water impermeability 16 atm, frost resistance 350 cycles, hardening time 25 min, acid and sulfate resistance after 36-day testing 34 and 41 MPa. EFFECT: improved working characteristics. 2 tbl
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