HIGH-STRENGTH CONCRETE Russian patent published in 2019 - IPC C04B28/04 C04B111/20 C04B16/04 C04B18/02 C04B14/06 

FIELD: construction.

SUBSTANCE: invention relates to high-strength concrete. High-strength concrete contains a silica-containing composition consisting of 20 % aqueous solution of polycarboxylate polymer (WRM) with pH value of pH=3.5 and density ρ=1.014 g/cm³; colloidal solution (sol) of silicic acid SiO₂⋅nH₂O with pH value of pH=3.5 and density ρ=1.014 g/cm³; sodium gluconate, with their following ratio, respectively, wt%: 49.0–52.0; 34.0–35.0; 14.0–16.0; complex additive. Complex additive consists of magnesite, in which content of magnesium oxide (MgO) is 42.5 %, calcium oxide (CaO) is 3.3 %; blast-furnace slag, the main phases of which are gelenite 2CaO⋅Al₂O₃⋅SiO₂; dicalcium silicate 2CaO⋅SiO₂ and melelite Ca2 (Al, Mg, Si) Si₂O₇, and sodium nitrate (NaNO₃), with their following ratio respectively, wt%: 56.0–59.0; 39.0–41.0; 2.0–3.0. Mixture components ratio, wt%: portland cement 19.66–22.90; sand with fineness modulus of 2.26 25.90–26.60; crushed stone of fraction 10–20 mm 41.50–43.50; said silica-containing composition 0.18–0.21; said complex additive 1.27–1.38; water 8.25–8.65.

EFFECT: high tensile strength during bending and high coefficient of chemical resistance.

1 cl, 1 tbl, 1 ex