Method and apparatus for the removal of chlorides from steel rei

Details Method and apparatus for the removal of chlorides from steel rei Method and apparatus for the removal of chlorides from steel rei

1990-07-31

1992-08-25

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204196, C23F 1300

Patent

active

051416077

ABSTRACT:
A method and apparatus for the removal of chlorides from steel reinforced concrete utilizes an electrode with a rectifier impressing a voltage between the steel of the concrete and the electrode. The electrode and the surrounding concrete are saturated continuously with a controlled flow of an aqueous electrolyte. The aqueous electrolyte which may be water or salt water increases chloride movement within the concrete away from the steel reinforcing and improves the efficiency of the process by maintaining a saturated pore structure within the concrete. To facilitate such saturation of the concrete and electrode, the electrode may be immersed in a matrix of a porous water absorbing medium contained within a non-metallic membrane or jacket cover. In some forms, a collecting bin or reservoir is provided at the bottom to collect the aqueous solution for recirculation. For offshore or other installations, no collecting reservoir may be required. The aqueous solution may also be obtained from a continuous expendable supply. The electrode, porous medium and membrane jacket cover, with or without the collecting reservoir, is provided in a preassembled reusable package. The assembly may readily be transported and mounted to or dismounted from the concrete structure.

REFERENCES:
patent: 4832803 (1989-05-01), Vennesland
Slater et al., "Electrochemical Removal of Chlorides from Concrete Bridge Decks", Nov. 1976, pp. 21-26.
Lankard et al., "Neutralization of Chloride in Concrete", Federal Highway Administration, Sep. 1975, pp. 46 and 96.

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