EXPANDING GROUTING MORTAR ( VARIANTS ) Russian patent published in 2004 - IPC

FIELD: potassium mining, back-filling of hole shaft in potassium mines. SUBSTANCE: expanding grouting mortar to backfill grouting spaces of hole shafts in potassium mines contains cement and mixing fluid, sulfate-resistant Portland cement is utilized in the capacity of cement and water and salt solution is used as mixing fluid with admixture to plasticize, compact and control solidification period-15% solution of lignosulfonates, additions increasing water resistance and density-fly ash, sodium silicate solution and calcium chloride, expanding additions such as semi- water gypsum and quicklime with following proportion of components, per cent by weight: sulfate-resistant Portland cement 79.0-81.0; 15% solution of lignosulfonates 1.0-1.8; fly ash 7.0-8.0; sodium silicate solution 2.6-3.4, calcium chloride 1.5-2.5; semi-water gypsum 2.0-2.8; quicklime 3.0-4.0. Above-mentioned mixing fluid is prepared to obtain water/cement ratio equal to 0.55. Water and salt solution in correspondence with invention can contain sodium-potassium sodium-saturated chloride brine. According to another variant expanding grouting solution to backfill grouting spaces of hole shafts in potassium mines contains cement and mixing fluid. Sulfate-resistant Portland cement is used as cement and water and salt solution with additives is utilized in the capacity of mixing fluid. Additives include plasticizing and compacting admixture controlling solidification period-15% solution of lignosulfonates, admixtures increasing water resistance and density-fly ash, sodium silicate solution and calcium chloride, expanding admixtures-semi-water gypsum, quicklime and 37% solution of orthophosphoric acid. Expanding grouting solution includes following proportion of components, per cent by weight: sulfate-resistant Portland cement 79.0-81.0; 15% solution of lignosulfonates 1.0-1.8; fly ash 6.8-7.5; sodium silicate solution 2.6-3.4; calcium chloride 2.0-3.o; semi-water gypsum 2.0-2.8; quicklime 2.5-3.5, 37% solution of orthophosphoric acid 0.3-0.7. Above-mentioned mixing fluid is prepared to obtain water/cement ratio equal to 0.55. EFFECT: preparation of expanding grouting mortar capable of expansion of cement plug, demonstrating definite period of setting between 28 and 30 h for more complete and uniform spread of mortar showing water resistance in salt brine. 3 cl, 2 tbl