Method of sealing water leakage in concrete structures
US4744193A · kind A · utility
11Cited by
11References
5Claims
0Family size
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Key dates
| Filing date | Nov 6, 1986 |
| Grant date | May 17, 1988 |
| Priority date | — |
| Expiry date | Nov 6, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2190/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.