HEAT-INSULATING CONCRETE Russian patent published in 2000 - IPC

FIELD: manufacture of concrete products both in civil and industrial engineering. SUBSTANCE: heat-insulating concrete comprises cement, sand, foam-forming additive, and water. Said heat- insulating concrete further comprises finely divided metallurgical production slag with elongation of 1500 sq cm/g which is solid solution of gelenite 2CaO•Al₂O₃•SiO₂ with okermanite 2CaO•MgO•2SiO₂. Foam-forming additive consists of sodium aboetate C₁₉H₂₉COONa•3C₁₉H₂₉COOH, KOH, hide glue, and water, with the following ratio of compounds, wt.%: sodium abietate C₁₉H₂₉COONa•3C₁₉H₂₉COOH, 37; KOH, 8.4; hide glue, 13; and water, 41.6. Sand is sandy loam comprising sedimentary rock consisting of SiO₂ of at least 80 % and clay of 20 %, specific surface of sandy loam of at least 120.0 sq cm/g, and chemical additive with pH of 5.5-6, ratios of components being as follows, wt.%: cement, 38-42; sandy loam, 24-28; finely divided metallurgical production slag, 11-13; chemical additive with pH of 5.5-6, 0.3-0.5; foam-forming additive, 0.3-0.5; and water, 22.4-20.0. EFFECT: improved heat-protecting properties and higher compression strength with low volume weight of the concrete. 2 cl, 1 ex, 1 tbl