FIELD: construction materials.
SUBSTANCE: additives for concrete mixtures, used to obtain additives for mortars, concrete, dry cement-based mortars. The additive for self-healing of concrete cracks contains granules with Bacillus subtilis bacteria, a calcium-containing nutrient in the form of calcium lactate and additionally contains a pozzolanic additive - metakaolin, or microsilica, or fly ash in the following component ratio, wt.%: granules with Bacillus subtilis bacteria - 19.9, calcium lactate - 0.4, metakaolin - 79.7, or with the following ratio of components, wt.%: granules with Bacillus subtilis bacteria - 14.2, calcium lactate - 0.3, microsilica - 85.5, or with the following ratio of components, wt.%: granules with Bacillus subtilis bacteria - 11.1, calcium lactate - 0.2, fly ash - 88.7.
EFFECT: development of a three-component additive that has the ability to heal concrete cracks up to 500 microns wide.
1 tbl
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