FIELD: chemistry.
SUBSTANCE: invention relates to structural materials and specifically to additives for concrete mixtures and can be used in making structures, articles and components in both industrial construction and construction of residential structures. The additive for concrete mixture contains Leuconostoc mesenteroides microorganisms cultured on a synthetic culture medium, and additionally microsilica, with the following ratio of components, wt %: Leuconostoc mesenteroides microorganisms cultured on a synthetic culture medium 33-44 and microsilica 56-67.
EFFECT: high consistency of the concrete mixture while preserving strength of the concrete.
2 tbl
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