GROUTING INJECTION MATERIAL Russian patent published in 1999 - IPC

FIELD: underground construction and mining industry. SUBSTANCE: material contains, wt %: Portland cement 40-43, quartz sand 40-32, and special-destination additive 1.5-3.5. The latter is aqueous solution of Ca(II), Al(III) and chloride ions and also dinaphthalenesulfonate at ratios Ca/Al 5-6, Ca/Cl 0.35-0.45 and (Ca+Al)/dinaphthalenesulfonate 1.3-2.4. EFFECT: accelerated hardening of materials at low positive temperatures and ensured high early strength of hardening material. 1 tbl