SETTING RETARDER FOR BACKING INJECTION MATERIAL, SETTING RETARDANT FLUID FOR BACKING INJECTION MATERIAL, BACKING INJECTION MATERIAL AND BACKING INJECTION TECHNIQUE

摘要

PROBLEM TO BE SOLVED: To suppress a change of the fluid A comprising a backing injection material with the lapse of time, in particular a change of the flowability or viscosity, to enable use over a long period of time and to improve bleeding resistance. SOLUTION: The setting retarder for a backing injection material is based on an amylolysis product contg. >=40 wt.%, preferably >=60 wt.%, particularly preferably >=80 wt.% maltose. The backing injection material contains 100 pts.wt. cement, 5-60 pts.wt. clay mineral and 0.9-6 pts.wt. the setting retarder. The fluid A comprising the backing injection material is sent under pressure, mixed with the fluid B comprising primarily water glass and hardened.