METHOD OF SEALING WATER LEAKAGE IN CONCRETE STRUCTURES

摘要

A mixture consisting of (1) an organic polyisocyanate compound and/or a prepolymer having terminal isocyanate residues, which is derived from the reaction of an organic polyisocyanate with a polyhydroxyl compound, and (2) 2-pyrrolidone is injected as grouting into water-leaking cracks or openings in concrete structures, such as water tanks, subway constructions and tunnels. The injected mixture diffuses into the cracks or openings and is cured in a short time by reacting with water at the leaking sites. The resultant polyurethane foam securely seals the water leaking sites.