CHROMIUM-MAGNESIA HEAT-RESISTANT CONCRETE COMPOSITION AND MANUFACTURING METHOD Russian patent published in 2018 - IPC C04B28/26 C04B40/00 B82B3/00 C04B111/20 C04B111/27 

FIELD: construction; technological processes.

SUBSTANCE: present invention relates to heat-resistant concretes. Chromium-magnesite heat-resistant concrete manufacturing composition, including binder, chromium-magnesite aggregate, fine fillers and water, as the binder contains colloidal sodium polysilicate with silicate module of 6.5, obtained by introducing the 16 % hydrosol of silica into the 20 % aqueous sodium silicate solution at a ratio of 1:1.6, stirring at 100 °C for 3.0 h with holding for not more than 0.5 h, and finely ground chromium-magnesite and periclase-chromite products finely ground scrap as finely ground filler with the following ratio of components, wt%: chromium-magnesite filler of 0.18–7 mm fraction: 60–80, finely ground chromium-magnesite S_sp=2,500–3,000 cm²/g: 8–16, colloidal nano-dispersed sodium polysilicate: 5–12.5, finely ground periclase-chromite products scrap S_sp=2,500–3,000 cm²/g: 7–11.5, water from the calculation of W/S of 0.12–0.14. Chromium-magnesia heat-resistant concrete producing method from the above composition, consisting in fact, that in the prefabricated colloidal sodium polysilicate with simultaneous mixing in the high-speed mixer, said finely ground fillers and water are introduced to obtain the uniform suspension, which is mixed with the chromium-magnesia aggregate in the forced action paddle mixer until a homogeneous mass is obtained, next, this mass is formed by the layer-by-layer compaction and the mass hardening is carried out during the drying process by the mode of: raising the temperature to 200 °C for 1 hour, holding at this temperature for 2 hours until the water complete removed.

EFFECT: increase in thermal and water resistance.

2 cl, 2 tbl