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

FIELD: building.

SUBSTANCE: invention refers to production of building materials and can be implemented at fabrication of items out of magnesite non-cement non-fired heat resistant concretes produced without preliminary firing. The composition for fabrication of non-fired magnesite heat-resistant concrete contains, wt %: magnesite 60-80, fine ground magnesite 8-16, silicate-block in form of nano-dimension particles 2-4, fine ground magnesium concentrate 4-10, fine ground diatomite 6-10, and water from calculation W/T 0.12-0.14. The procedure of fabrication of non-fired 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 magnesite filler, fine ground magnesite, magnesium concentrate and diatomite and in addition to their mixture, while mixing, of water mixture of sodium silicate- block in form of their 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 and diatomite are produced by means of dry combined grinding.

EFFECT: enhanced strength and thermal resistance of magnesite heat resistant concrete.

3 cl, 1 ex