FIELD: construction.
SUBSTANCE: invention relates to construction materials and can be used in making concrete and mortar hardening at low temperatures. Antifreeze additive for concrete mixture contains, wt. %: silica gel 79.43–87.49, polycarboxylate-based superplasticiser Melflux 2651F 2.75–4.92, antifoaming agent Troykyd D128 0.03–0.05, sodium thiosulphate 9.73–15.6.
EFFECT: technical result is high strength of concrete during compression at age 28 days during hardening at negative temperatures.
1 cl, 1 tbl
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