FIELD: chemistry.
SUBSTANCE: present invention concerns complex additive composition for concrete mix and can be applied in manufacturing concrete and ferroconcrete items and constructions. The complex additive for concretes and building mortars includes supersoftener, industrial lignosulfonates, potash, and additionally sodium formiate at the following component ratio, in mass % (in dry equivalent): supersoftener 41-60, industrial lignosulfonate 0.3-0.4, potash 5-40, sodium formiate 30-40. C-3 or Polyplast SP-1 can be applied as supersoftener.
EFFECT: frost-resistant complex additive, which allows for reducing shrinkage deformation at preserved softening capability.
2 cl, 3 tbl
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