Concrete repair process
View Patent ↗The present invention provides a process for repairing concrete involving filling one of a void, gap or seam in the concrete with a polyurethane sealant containing a silane terminated prepolymer (“STP”), and a catalyst, optionally, one or more of plasticizers, fillers, pigments, drying agents, light stabilizers, antioxidants. thixotropic agents and bonding agents and applying an isocyanate-terminated prepolymer containing polyurethane or polyurea coating to the silane terminated prepolymer polyurethane sealant.
1. A process for repairing concrete comprising:
filling one of a surface void, gap or seam in the concrete with a polyurethane sealant comprising,
a silane terminated prepolymer (“STP”), and
a catalyst,
optionally, one or more of plasticizers, fillers, pigments, drying agents, light stabilizers, antioxidants, thixotropic agents and bonding agents; and
applying an isocyanate-terminated prepolymer containing polyurethane or polyurea coating to the silane terminated prepolymer polyurethane sealant.
2. The process according to claim 1 , wherein the concrete is wet.
3. The process according to claim 1 , wherein the concrete is in an environment having a relative humidity of at least 40%.
4. The process according to claim 1 , wherein the concrete is in an environment having a relative humidity of at least 50%.
5. The process according to claim 1 , wherein the concrete is in an environment having a relative humidity of at least 90%.
6. The process according to claim 1 , wherein the concrete is in an environment having a relative humidity of 100%.
7. The process according to claim 1 , wherein the concrete is under water.
8. The process according to claim 1 , wherein the isocyanate-terminated prepolymer containing coating is a polyurethane.
9. The process according to claim 1 , wherein the isocyanate-terminated prepolymer containing coating is a polyurea.
10. A process for repairing concrete comprising:
filling one of a surface void, gap or seam in the concrete with a polyurethane sealant comprising,
a silane terminated prepolymer (“STP”), and
a catalyst,
optionally, one or more of plasticizers, fillers, pigments, drying agents, light stabilizers, antioxidants. thixotropic agents and bonding agents;
allowing the polyurethane sealant to cure; and
applying an isocyanate-terminated prepolymer containing polyurethane or polyurea coating to the cured silane terminated prepolymer polyurethane sealant.
11. The process according to claim 10 , wherein the concrete is wet.
12. The process according to claim 10 , wherein the concrete is in an environment having a relative humidity of at least 40%.
13. The process according to claim 10 , wherein the concrete is in an environment having a relative humidity of at least 50%.
14. The process according to claim 10 , wherein the concrete is in an environment having a relative humidity of at least 90%.
15. The process according to claim 10 , wherein the concrete is in an environment having a relative humidity of 100%.
16. The process according to claim 10 , wherein the concrete is under water.
17. The process according to claim 10 , wherein the isocyanate-terminated prepolymer containing coating is a polyurethane.
18. The process according to claim 10 , wherein the isocyanate-terminated prepolymer containing coating is a polyurea.