HYDROPHOBIC CEMENT MANUFACTURE PROCESS Russian patent published in 2004 - IPC

FIELD: manufacture of building materials. SUBSTANCE: process comprises mixing cement with hydrophobic additive: carbon-containing naturally occurring material preliminarily crushed into pulverized state and used in amounts from 0.5 to 10% considered as absolutely dry substance, after which mixture is heated to 180-350 C. Carbon-containing material can be represented by valley, high-moor, or intermediate-type peat, graphite, brown coal, coal, anthracite, peat/graphite mix (0.5-99.5):(99.5-0.5), peat/coal mix (0.5-99.5): (99.5- 0.5), graphite/coal mix (0.5-99.5):(99.5-0.5), or peat/graphite/coal mix (0.5-99.5):(0.5-99.5):(0.5-99.5). EFFECT: increased water-repellent capacity. 8 cl, 2 dwg, 1 tbl, 4 ex