FIELD: manufacture of building materials.
SUBSTANCE: concrete mix is modified by introducing (i) aqueous solution of polymeric compounds with different molecular mass obtained by condensation of naphthalenesulfonic acid and formaldehyde and (ii) ferrous or ferric salts in amount 2-4% of the weight of mix, said polymeric compounds being used in amount 0.3-0.7% of the weight of cement in case of degree of polycondensation equal to 2-5 and at their ratio to water between 30:70 and 40:60. Iron salt is added after addition of above-indicated aqueous solution.
EFFECT: increased density and strength of concrete in early stages of process.
3 dwg, 4 tbl, 5 ex
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