FIELD: manufacture of building materials. SUBSTANCE: Concrete mix is composed of, wt %: Portland cement mark A, 13-15; quartz sand fractions below 0.63 mm and 0.63-2.5 mm in proportion providing formation of mix with maximum loose density, 78.3-81.301; superplastisizer C-3, 0.493-0.991; dextrin added to plasticizer, 0.006-0.009; and water, 5.2-5.7. EFFECT: reduced cement consumption. 2 tbl
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