BACK-FILLNG INJECTING MATERIAL

摘要

PROBLEM TO BE SOLVED: To obtain a back-filling injecting material capable of reducing the gel time and improved in gel initial strength, strength after several hours and long term strength by blending a calcium silicate hydrate in stead of the conventiona.l bentonite to A liquid. SOLUTION: In the back-filling injecting material for injecting the mixture of the A liquid with B liquid to a required place such as the gap part of the ground or the like, the A liquid is a slurry having the molar ratio Ca/Si of l.0-4.0 and 5-35% ignition loss and prepared by mixing a calcium silicate hydrate, cement and water and the B liquid is a water glass. The concentration of calcium ion is increased than at the time of using bentonite by this way and a gel having the strength larger than that at the time of using bentonite is produced by adding the B liquid containing the water glass therein. As a result, the gel time is made shorter compared to the conventional back-filling injecting material and the effect that the increase of the extra initial. strength, the strength after several hours and the long term strength are improved is attained.