Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1994-02-28
1995-04-18
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204147, 204196, C25F 700
Patent
active
054075432
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.
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Slater et al, "Electrochemical Removal of Chloride from Concrete Bridge Decks", Material Performance, Nov. 1976, pp. 21-26.
Lankard et al, "Neutralization of Chloride in Concrete", Federal Highway Administration Report No. FHWA-RD-76-60, Sep., 1975, pp. 46 and 96.
Poulsen, "Re-Alkalisation of Carbonated Concrete Facades by Electro-Osmosis", Dansk Beton, nr 4, Jun. 12, 1988, pp. 20, 21, 23, 25.
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