LIGHT-WEIGHT CONCRETE Russian patent published in 2006 - IPC C04B38/08 

FIELD: manufacture of building materials and articles; light-weight structural insulating concrete.

SUBSTANCE: proposed light-weight concrete contains cement, hollow micro-spheres - component separated by reagentless floatation from ash-and-slag mixtures and water; it additionally contains silicon opal-cristobalite mineral - tripolite of the following fractional composition, %: 0.315 - 0.14 mm 27-31.1, 0.14-0.071 mm 30.1-33.2 lesser than 0.071 mm 32.9-39.7 at the following ratio of components, mass-%: cement, 24.9-29.3; tripolite, 6.8-14.2; micro-spheres, 34.8-41.1; the remainder being water.

EFFECT: reduced density and heat conductivity.

5 tbl, 1 ex