FIELD: building materials industry, more particularly manufacture of prefabricated and monolithic products and structures. SUBSTANCE: concrete mix comprises cement, filler and complex additive which includes ammonium nitrate, calcium chloride and bishofite which comprises basically (up to 96%) of crystalline magnesium chloride MgCl2•6H2O, ratios of additive components being as follows, wt %: ammonium nitrate, 1.5-2.25: calcium chloride, 0.3-0.75; and bishodint, 1.0-1.50. EFFECT: improved properties of the concrete mix.
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