Process for rehabilitating internally reinforced concrete by electrical treatment
US5407543A · kind A · utility
Inventor
Key dates
| Filing date | Feb 28, 1994 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Feb 28, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G23/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for rehabilitation of internally reinforced concrete which comprises applying to surface areas of the concrete a temporary sprayed-on layer of a self-adherent, electrolytic material comprised of cellulosic pulp fiber mixed with liquid electrolyte. A distributed electrode means, preferably a wire grid, is embedded between layers of the self-adherent coating, and preferably is supported by spaced-apart, non-conductive battens. Voltage sufficient to develop a current of about 1-5 amps/m.sup.2 is applied between the reinforcement and the distributed electrode, to cause migration of chloride ions from the concrete into the electrolytic coating. When the chloride content of the concrete has been reduced to a desired level, the voltage is discontinued and the adherent electrolytic coating and distributed electrode are removed. Preferred electrolytes include water or other solutions, such as calcium hydroxide. Desirably, the distributed electrode is formed of a ferrous material reactive with chlorine, to minimize the release of free chlorine gas into the ambient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.