Method of sealing water leakage in concrete structures
AssigneesTaisei Corporation, Nisshinboseki Kabushiki Kaisha
InventorsToshio Hatsuzaki, Yoshihiko Ogawa, Toshio Hiramatsu, Hideo Senga, Takehiko Tokoro
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Abstract
A mixture consisting essentially 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 for grouting into water-leaking cracks or openings of concrete structures such as water tanks, subway constructions and tunnels. The injected mixture diffuses into the cracks or openings and is cured in short time by reacting with water at the leaking sites. The resultant polyurethane foam securely seals the water leaking sites.
Claims5
A method of sealing water leakage in concrete structures which comprises:
- injecting a grouting mixture consisting essentially of (1) an organic polyisocyanate compound and/or a prepolymer having terminal isocyanate residues, which is derived from a reaction of an organic polyisocyanate with a polyhydroxyl compound and (2) 2-pyrrolidone into openings or cracks at a leaking site of a concrete structure and curing said grouting mixture by hydration reaction to form polyurethane foam to stop the water leakage.
Dependencies are inferred from the claim text.