LIGHT-WEIGHT HEAT-RESISTANT GROUTING MATERIAL Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: lightweight heat-resistant grouting material contains, mas. bentonite mud powder 2.0-19.0; filtering perlite 3.0-10.0; hydrolyzed polyacrylonitrile 1.0-1.3, and binder 70.0-93.7. Filtering perlite is used with the following composition, mas. SiO₂ 65-74; Al₂O₃-12-15; 65-74; Fe₂O₃ - 1,5-2,5 12-15; R₂O₃- 5-7 1.5-2.5; CaO 1.5-2.5; MgO 0.5-1.5; 60-1400 kg/m³ 5-7; some others 3-7. Grouting material features: density 60- 1400 kg/cu. m; moisture content within 2% floating particles not above 12% EFFECT: low water loss of material and low gas permeability of stone with simultaneous increase of stone strength. 2 cl, 1 tbl