GROUND MATERIAL FOR POURING GROUND AND GROUND POURING WORKING METHOD USING THE SAME

摘要

PROBLEM TO BE SOLVED: To obtain a grout for grouting ground which does not cause shortening of a gelation time keeping it long even if contacted with soil and sand in the ground, exhibits high permeability and is easy to adjust the gelation time in soil and therefore suitable for improvement of a large volume of soil and to provide a method for grouting ground using the same. SOLUTION: This grouting material comprises as effective ingredients a water glass and phosphoric acid and satisfies simultaneously the following three requirements (1), (2) and (3): (1) The molar ratio (n) of the water glass is 3.6-5.0. (2) The concentration of SiO2 is 3(%)SiO2(%)1.7n(%). (3) The liquid property is acid to neutral. The method for grouting ground comprises injection of a rapid aggregating grout or a suspension type grout as a primary injection material followed by injection of the abovementioned grout material as a secondary injection material.