Patching method
Abstract
Abstract A method of repair using a two component system of a reactive component and an inert particulate aggregate. The reactive component is a mixture of an acid phosphate salt and MgO particles and the aggregate can be sand and silica. The MgO particles are minus 100 mesh and have a bulk density of at least 50 pounds per cubic foot. From 7-50 parts by weight of the reactive component are mixed with from 93-50 parts by weight of the aggregate. The proportion of the acid phosphate salt to MgO is maintained such that a continuous cementitious phase is formed during reaction to form magnesium phosphate and surrounds the aggregate and the remaining MgO particles. A workable slurry is formed by mixing the reactive component and the aggregate with sufficient water that the exothermic heat of reaction is such that the slurry cures to a solid having adequate compressive strength at an early cure age. The slurry is inserted in the defect which requires patching, is shaped as required, and is allowed to harden.
Inventors
- 👤 C Schwartz
Bibliographic Details
Claims Analysis
Total Claims: 5References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |