CONCRETE MIXTURE Russian patent published in 1998 - IPC

FIELD: production of protective concrete which may be used as protection against ionized irradiation. SUBSTANCE: mixture comprises, mas.%: portland cement, 37.04-39.17; schungisite dust (having specific surface 2800 cm²/g and particles being 50-250 mcm in size), 12.28-13.21; schungisite sand (size of particles being 0.14-2.5 mm), 29.45-31.68; superpeptizing additive, 0.259-0.274; saponified woody resin being used as air-implicating additive, 0.018-0.02, boron carbide having formula B₄C, 1.68-1.73; water, 17.7-18.8. Compressive strength of samples being irradiated by 3500 Mrad dose in a year is up to 26.7 MPa, their tensile strength is up to 5.2 MPa, waterproofness is up to 10.0 kgf/cm², gas permeability is up to 4.2 s/cm³. EFFECT: improved quality. 2 tbl