CONCRETE MIX Russian patent published in 2006 - IPC C04B38/08 C04B28/04 C04B111/20 

FIELD: manufacture of building materials.

SUBSTANCE: object of invention are special refractory concretes based on Portland cement and slag aggregates, which concretes can be used in manufacture of heat assemblies operated under prolonged high-temperature and sharp temperature gradient conditions. Concrete mix contains 16-22% Portland cement, 10-20% alumina hydrate in the form of production waste, 28-36% sand slag-pumice fraction up to 5-20 mm, broken slag fraction 5-20 mm, 0.5-1.5% super-plasticizer S-3, and water, said alumina hydrate being waste coming from synthetic rubber production or from radio component plant, namely from manufacture of electrolytic condensers in the form of aluminum foil etching waste.

EFFECT: increased density due to filled hollows in porous aggregate with alumina hydrate or reaction product thereof with lime releasing on hydration of clinker minerals, increased residual strength after firing at 800°C, and increased heat resistance.

2 tbl