FIELD: manufacture of building materials.
SUBSTANCE: invention concerns porous granulated heat-retention materials serving as especially light-weight filling material for industrial and civil-construction concretes. Raw mix for preparation thereof contains, wt %: microsilica 39.23-40.77, caustic soda (calculated as Na2O) 7.13-7.41, fly ashes from heat-and-power station 2.04-3.96, and water 49.67-49.78.
EFFECT: reduced crude granule heat treatment time, lowered temperature of hydrothermal treatment of raw mix, reduced loose density and bulk water absorption, and increased porosity and strength of granulated material.
2 cl, 2 tbl
