GROUT FOR GROUND

PROBLEM TO BE SOLVED: To obtain a grout which is of a water glass or suspension type one poured into ground to solidify it, has a gelation time easily controllable so as to range widely from a short time to a long time, has excellent penetrativity and can be solidified into a gel reduced in shrinkage and having high strengths. SOLUTION: This grout is a water glass based one containing water glass and a curing agent, wherein the curing agent comprises a water-soluble aluminum compound and a water-soluble polyvalent metal compound and/or a water- soluble phosphoric acid compound. Alternatively, it is a suspension type one comprising cement and/or slag and a curing agent, wherein the curing agent comprises water glass, a water-soluble aluminum compound and a water-soluble polyvalent metal compound. It is desirable that the water-soluble aluminum compound is an alkali metal aluminate, the water-soluble polyvalent metal compound is calcium chloride, and the water-soluble phosphoric acid compound is phosphoric acid, an alkali metal dihydrogenphosphate or a trialkali metal phosphate.