FIELD: construction.
SUBSTANCE: invention relates to construction materials, namely to compositions of additives, used in making concrete and mortar. Additive for concrete mixtures and mortar, containing citrate dihydrate, which is treated at temperature of 200 °C for 2–3 hours, wherein additive additionally contains aluminium sulphate in following proportions, wt%: trisodium anhydrous technical sodium citrate 75–80; aluminium sulphate 20–25.
EFFECT: technical result is obtaining additive for concrete mixtures and mortar increasing time of setting and set of strength of concrete during early hardening stages, and higher water impermeability of concrete.
1 cl, 2 tbl
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