Method of preparing additive for cement mixture with increased resistance to aggressive medium includes combination and mechanical mixing of mixture ingredients. Additionally, dry additive elements are mixed with gradual addition of aluminium sulphate salt solution, and after homogeneity is achieved, liquid preservative – benzylalkonium chloride is added. As dry additive elements, methyl hydroxyethyl cellulose is used as redispersing polymer powder and calcium formate to obtain a mixture.

The utility model relates to the construction industry, specifically to methods of preparing mixtures used in environments with increased destructive effects of aggressive sulfate and chloride-ion components, which affect the durability and strength of cement structures.

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