Long-Term Performance of Corrosion Inhibitors Used in Repair of Reinforced Concrete Bridge Components
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2002-01-01
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Abstract:In 1987, the Strategic Highway Research Program (SHRP) launched a project (SHRP C-103) to evaluate the effectiveness of using corrosion inhibitors as a means for mitigating corrosion in reinforced concrete bridge components. That project, completed in 1993, involved a laboratory study and field validation, and concluded that corrosion inhibitors could be successfully applied with field repair and rehabilitation techniques. A follow-on study of the SHRP effort was initiated by the Federal Highway Administration (FHWA) in 1994 and ended in 1999. The primary objective of the project was to determine the effectiveness of cathodic protection, electrochemical chloride extraction, and corrosion-inhibitor treatment systems installed during the SHRP effort through the long-term evaluation of 32 field test sites and a number of laboratory concrete slab specimens. The FHWA program required monitoring the long-term performance of corrosion inhibitor treatments on selected components of four bridges that were treated and evaluated under SHRP C-103. Three evaluations over a period of 5 years were conducted on structures located in Minnesota, New York and Pennsylvania, and two evaluations were conducted on a structure in Washington State. An analysis of the results concluded that neither of the corrosion inhibitors evaluated in this study, using the specified repairs and exposed to the specific environments, provided any corrosion-inhibiting benefit. Shrinkage cracking plagued repairs at all test sites except for the Washington site. The concrete surrounding the patched areas was contaminated with chloride ions to varying degrees. In some test sites, shrinkage cracking allowed faster ingress of chloride ions into the repair patches. At all four sites, the results of the visual and delamination surveys and corrosion rate measurements did not show any difference between patches containing corrosion inhibitors and those that did not contain them.
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