CONCRETE MIX Russian patent published in 2003 - IPC

FIELD: manufacture of building materials. SUBSTANCE: concrete mix contains, wt %: Portland cement 9.0-10.1, crushed stone 52.9- 58.5, sand 25.7-28.5, mineral powder 1.1-2.2, and water (the balance), said sand being concentration waste from dry magnetic separation of ferruginous quartzite fraction (0.14-5)71•10^-6 M and said mineral powder being concentration waste from dry magnetic separation of ferruginous quartzite having at least 70% fraction below •10^-3 and specific surface at least 250 sq.m/kg. EFFECT: reduced consumption of cement and increased strength of concrete without loss in its high frost resistance. 2 tbl