COMPOSITION AND METHOD OF MAKING UNFIRED QUARTZITE HEAT-RESISTANT CONCRETE Russian patent published in 2009 - IPC C04B28/26 C04B40/00 B82B3/00 C04B111/20 

FIELD: chemistry.

SUBSTANCE: invention relates to the industry of construction materials and can be used in making objects from quartzite heat-resistant concrete, obtained without precalcination 1. The composition for making unfired quartzite heat-resistant concrete contains, wt %: quartzite filler 70 to 91, fine quartzite 6 to 20, sodium silicate lumps in form of nanoparticles 1 to 4, fine dolomite 2 to 6, water in terms of B/T 0.12 to 0.14. The method of making unfired quartzite heat-resistant concrete from the said composition involves converting sodium silicate lumps into nanoparticles through dehydration dispersion of hydrated sodium silicate lumps finely ground to specific surface area of 2500 to 3000 cm²/g at temperature ranging from 200 to 600°C, mixing quartzite filler, fine quartzite and dolomite with addition of an aqueous mixture of sodium silicate lumps in form of nanoparticles at temperature ranging from 80 to 90°C while stirring, and then water at temperature ranging from 80 to 90°C, stirring the obtained mixture, moulding objects from the mixture and treatment of the object with thermal shock at temperature ranging from 250 to 300°C for 1 to 2 hours.

EFFECT: increased strength and heat resistance of concrete.

2 cl, 1 ex, 1 tbl