Electro-chemical method for minimizing or preventing corrosion of reinforcement in concrete
US5538619A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1994 |
| Grant date | Jul 23, 1996 |
| Priority date | — |
| Expiry date | Apr 25, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B41/72
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process and system for rehabilitating mature concrete structures, which have become carbonated and/or infused with chlorides and thus represent a corrosive environment for internal reinforcing steel. The surface of the concrete is first repaired with a special mortar having resistivity and capillarity consistent with the parent concrete and the process requirements. An elongated, flat, flexible, ribbon-like electrode element is supported in spaced relation over the surface of a concrete area to be treated, being threaded back and forth and oriented in edgewise fashion to the concrete surface. Thereafter a self-adherent, cohesive mixture of delignified cellulose pulp fibers and a liquid electrolyte solution is sprayed onto the surface of the concrete, to a level to cover and embed the ribbon-like electrode element, forming an electrolytic medium associated with the electrode element. A DC voltage is impressed between the internal reinforcement and the embedded electrode element to effect electro-chemical chloride removal and/or realkalization of the concrete in a procedure of finite time duration. Preferably, the electrode strip is passed about conductive supports at one side of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.