CEMENT-BASED GROUT COMPOSITION

PROBLEM TO BE SOLVED: To obtain a cement-based grout compsn. showing high fluidity and proper viscosity in low W/G, easy in kneading, excellent in filling property for a part having a complicated shape and excellent in mechanical strength by compounding a hydraulic cement holding water and an expanding agent. SOLUTION: This grout compsn. contains a hydraulic cement holding water and an expanding agent. Especially, before the grout compsn. and water are kneaded in a specified W/G and used for construction, a hydraulic cement holding water and an expanding agent are incorporated into the grout. It is preferable that the grout contains an expanding agent and such a hydraulic cement that water is present in a hydrate state on the particle surface. The weight ratio of water/hydraulic cement is preferably 0.2 to 5, and the expanding agent is preferably added by 1-20 pts.wt. to 100 pts.wt. of the hydraulic cement, Further, a water-absorbing polymer is preferably added by 0.005-0.2 pts.wt. to 100 pts.wt. of the hydraulic cement.