FIELD: construction.
SUBSTANCE: invention relates to compositions of crude mixtures used in production of concrete. Crude mixture contains, wt%: portland cement or slag-portland cement 19.0-23.0; scrap red brick fraction 20-40 mm 50.0-55.0; pyrite cinder 0.5-1.0; claydite gravel with particle size 5-10 mm 3.0-5.0, at water-cement ratio 0.55-0.6.
EFFECT: technical result consists in improvement of strength of articles.
1 cl, 1 tbl
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