FIELD: construction.
SUBSTANCE: invention is related to construction materials, in particular to compositions of complex additives for preparation of concrete. Complex additive contains the following components, wt %: technical lignosulfonates - LST - 3.5-3.9, sodium nitrite - 16.0-16.9, mineralised drains - waste of refining production of nonferrous metals, including sodium and calcium chlorides - 31.0-33.8, water - the rest. In version additive includes the following components, wt %: superplasticiser C-3 2.5-3.0, sodium nitrite 16.0-16.9, specified mineralised drains - 31.2-34.3, water - the rest.
EFFECT: accelerated development of strength in process of hardening under normall conditions, at negative temperature and under conditions of heat and moisture treatment, increased strength of concrete, and also reduction of concrete cost.
2 cl, 2 tbl
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