United States Department of Transportation
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Evaluation of Electrochemical Chloride Extraction (ECE) and Fiber Reinforced Polymer (FRP) Wrap Technology
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2000-06-01
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[PDF-2.25 MB]
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Edition:Final Report 1997-1999
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Abstract:Methods for mitigating corrosion in reinforced concrete structures were investigated on the substructure of a bridge in Minneapolis, Minnesota. Several corrosion-damaged columns and pier caps were treated with electrochemical chloride extraction (ECE), and then selected ECE-treated and untreated structures were wrapped with FRP wraps or sealed with concrete sealers to prevent future chloride ingression. Embeddable corrosion monitoring instrumentation was installed in the field structures to evaluate the effectiveness of ECE treatment. Although the ECE process reduced average chloride levels in the treated structures by approximately 50%, several locations still had chloride concentrations in excess of the established corrosion threshold following ECE treatment. Resistivity probe failures that occurred at some of these locations indicated corrosion within the treated structures could still occur, despite re-passivation of the reinforcing steel following ECE treatment. Continued monitoring of the installed instrumentation is required to evaluate the long-term effectiveness of ECE treatment and concrete wrapping/sealing as a corrosion mitigation technique.
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