Process for rehabilitating internally reinforced concrete by rem

Details Process for rehabilitating internally reinforced concrete by rem Process for rehabilitating internally reinforced concrete by rem

1990-06-15

1993-07-20

Tung, T.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204147, 2041531, 204400, 204412, C25F 100, C23F 1300

Patent

active

052289591

ABSTRACT:
A process for rehabilitation of internally reinforced concrete which comprises the temporary application of an adherent coating of an electrolytic material, formed of cellulosic pulp to surface areas of the concrete. Distributed electrode means, preferably a ferrous metal wire grid, is embedded in the adherent coating. 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 electrolytic coating and distributed electrode are removed. Particularly for tensioned reinforcement, the process monitors polarization of the tensioned steel to prevent hydrogen embrittlement.

REFERENCES:
patent: 756328 (1904-04-01), Christy
patent: 2913378 (1959-11-01), Dean et al.
patent: 4832803 (1989-05-01), Vennesland et al.
patent: 4855024 (1989-08-01), Drachnik et al.
patent: 4865702 (1989-09-01), Miller et al.
J. E. Slater, "Electrochemical Removal of Chlorides from Concrete Ridge Decks", Materials 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, 96.

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