Cementitious grout patching formulations and processes
US4769077A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1987 |
| Grant date | Sep 6, 1988 |
| Priority date | — |
| Expiry date | Jun 30, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/72
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A dry cementitious composition which is shrinkage compensating and fast-setting for use in grouting repair of concrete surfaces. The cementitious composition comprises a hydraulic cement mixture of a major amount of a first portland cement constituent and a minor amount of a second expansive ettringite sulfoalumina cement constituent, an aggregate component, and an accelerator component. The accelerator component is a polyvalent metal salt of formic acid, specifically an alkaline earth metal formate such as calcium formate. Specific formulations include a mixture of Type I, Type IP, or Type III cement as a first constituent with Type K, Type M, or Type S cement as a second constituent, with the ratio of the first to the second constituent within the range of 2-3. The material may be employed to affect a grouting repair by mixing the dry formulation with water to provide a cementitious slurry which sets to provide a compressive strength of at least 4000 psi at 24 hours and a positive volume change of no more than 0.1% at 14 days curing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.