Encyclopedia
ceramic granules
Keramzit is a material obtained by firing with expansion of prepared granules (grains) from clay and sand-clay rocks (clays, silty clays, clayey shales, argillite, aleurolite), shungite-containing rocks, tuff, fly ash slag mixtures or fly ash from thermal power stations
Source: "GOST 25137-82* (CT SEV 5445-85). Non-aggregate construction materials, dense gravel and sand from industrial waste, porous fillers for concrete. Classification"
(introduced by the Decree of the State Construction Committee of the USSR dated December 31, 1981 No. 291)