COMPOSITION AND PROCEDURE FOR FABRICATION OF NON-FIRED CHROMIUM-MAGNESITE HEAT RESISTANT CONCRETE Russian patent published in 2009 - IPC C04B28/26 C04B40/00 B82B3/00 C04B111/20 

FIELD: building.

SUBSTANCE: invention refers to building materials and can be implemented at production of items out of chromium-magnesite non-fired heat resistant concrete. The composition for fabrication of non-fired chromium-magnesite heat-resistant concrete contains, wt %: chromium-magnesite filler 65-87, fine ground chromium-magnesite 6-16, sodium silicate-block in form of nano-dimension particles 2-4, fine ground magnesium concentrate 5-15, and water from calculation W/T 0.12-0.14. The procedure of fabrication of non-fired chromium-magnesite heat-resistant concrete out of the above said composition consists in conversion of sodium silicate-block into nano-dimension particles by means of dehydration dispersion of hydrated sodium silicate-block fine ground to specific surface of 2500-3000 cm²/g at temperature 200-600°C, in mixing chromium-magnesite filler, fine ground chromium-magnesite and magnesium concentrate and in addition to their mixture, while mixing, of water mixture of sodium silicate- block in form of nano-dimension particles with temperature 80-90°C, and then in addition of water with temperature 80-90°C, in mixing the produced mixture, in moulding items out of it and in treatment of items with thermo-shock at temperature 250-300°C during 1-2 hours. Also fine ground magnesium concentrate is produced by means of dry grinding.

EFFECT: enhanced strength and thermal resistance of concrete.

3 cl, 1 ex