FIELD: construction. SUBSTANCE: during concrete mixture preparation antifreezing addition is inserted in its composition. After casting in forms concrete mixture is being kept under negative temperature and than subjected to heat and moisture treatment. Composition, made of sodium nitrite, micro silica and potassium carbonate, is used as introduced addition. Concrete mixture freezing is exercised under temperature of minus 10 - 15 C within 24 hours. Thermomoisture treatment is exercised by steam under 80 - 90 C in sequence of 3 + 12 + 4 hours. EFFECT: increased strength and freeze-resistance of concrete of precast reinforced concrete pieces.
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