HIGH-STRENGTH CONCRETE Russian patent published in 2020 - IPC C04B28/04 

FIELD: construction.

SUBSTANCE: invention relates to construction materials and can be used for making articles from concrete in civil and industrial construction, as well as in production of special-purpose structures. Set task is achieved due to that high-strength concrete obtained from a mixture comprising Portland cement, sand, crushed stone, an additive and water, according to the invention sand contains sand with a fineness modulus of 2.2–3.2, as crushed stone granite or gravel fractions of 3–25 mm, additionally contains blast-furnace slag with specific surface area of at least 280 m²/kg and pH value of pH=7–13, and also contains reactive filler consisting of metakaolin, finely-dispersed polymer based on allyl ether and maleic acid anhydrite and potassium nitrate in following ratio of components, wt%: metakaolin 43.0–49.0, finely dispersed polymer 43.0–47.0, potassium nitrate 8.0–10.0, with the following ratio of components, wt%: Portland cement 8.0–15.0, blast-furnace slag 3.0–6.0, sand 33.9–36.0, crushed stone 40.0–46.0, additive 0.6–1.0, reactive filler 0.5–0.8, water 2.0–5.0. As an additive, concrete contains a solution of polycarboxylate polymers modified with organic and inorganic substances, as well as nanodispersions of hydrated silicon dioxide.

EFFECT: high crack resistance and high corrosion resistance of high-strength concrete with respect to sulphate and magnesia corrosion.

1 cl, 2 tbl