Corrosion Protection Service Life of Epoxy-Coated Reinforcing Steel in Virginia Bridge Decks

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dc.contributorVirginia Transportation Research Councilen
dc.contributorVirginia Techen
dc.contributor.authorBrown, Michael C.en
dc.contributor.authorWeyers, Richard E.en
dc.contributor.authorMegan C. Wheeleren
dc.contributor.departmentCivil and Environmental Engineeringen
dc.date.accessed2013-11-21en
dc.date.accessioned2014-03-19T18:30:10Zen
dc.date.available2014-03-19T18:30:10Zen
dc.date.issued2003-09-01en
dc.description.abstractThe corrosion protection service life extension provided by epoxy-coated reinforcement (ECR) was determined by comparing ECR and bare steel bars from 10 Virginia bridge decks built between 1981 and 1995. The objective was to determine the corrosion protection service life time extension provided by ECR field specimens with various degrees of coating adhesion: disbonded, partially disbonded, and wholly bonded coatings. The size and length distributions of cracks in Virginia bridge decks were investigated to assess the frequency and severity of cracks. Correlation of cracks with chloride penetration was used to characterize the influence of cracking on deck deterioration. Cracks influence the rate of chloride penetration, but the frequency and width distributions of cracks indicate that cracks are not likely to shorten the overall service life of most bridge decks in Virginia. Altogether, 141 drilled cores, 102 mm (4 inches) in diameter, were employed in this study. For each of the decks built with ECR, 10 to 12 cores were drilled through a top reinforcing bar adjacent to the previous study core locations. In addition, approximately 3 cores were drilled through a top reinforcing bar at a surface crack location. Laboratory testing involved nondestructive monitoring using advanced electrochemical techniques to periodically assess the corrosion state of the steel bars during cyclic exposure to chloride-rich solution over 36 months of treatment. Time of corrosion initiation and time of cracking (where applicable), as well as chloride content of the concrete before and after treatment, were used in the analysis. Analysis of the epoxy coating after treatment showed the presence of micro cracks in the surface of some coatings, and moisture uptake and glass transition temperatures, as related to curing of the coatings, were investigated. Less than 25 percent of all Virginia bridge decks built under specifications in place since 1981 is projected to corrode sufficiently to require rehabilitation within 100 years, regardless of bar type. The corrosion service life extension attributable to ECR in bridge decks was found to be approximately 5 years beyond that of bare steel and, therefore, ECR is not a cost-effective method of corrosion prevention for bridge decks. Deleting the requirement for ECR in decks would save Virginia approximately $845,000 per year.en
dc.description.sponsorshipVirginia Department of Transportation 21706en
dc.description.sponsorshipFHWA 21706en
dc.format.extent66 pagesen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationMichael C. Brown, Ph.D., P.E., Richard E. Weyers, Ph.D., P.E., and Megan C. Wheeler. "Corrosion Protection Service Life of Epoxy-Coated Reinforcing Steel in Virginia Bridge Decks," Virginia Transportation Research Council 530 Edgemont Road Charlottesville, VA 22903, Report No. FHWA/VTRC 04-CR7, Sept. 2003.en
dc.identifier.govdocFHWA/VTRC 04-CR7en
dc.identifier.urihttp://hdl.handle.net/10919/46652en
dc.identifier.urlhttp://www.virginiadot.org/vtrc/main/online_reports/pdf/04-cr7.pdfen
dc.language.isoen_USen
dc.publisherVirginia Center for Transportation Innovation and Researchen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectBridgesen
dc.subjectDecksen
dc.subjectService lifeen
dc.subjectChloridesen
dc.subjectCorrosionen
dc.subjectRehabilitationen
dc.subjectEpoxy-coated reinforcementen
dc.subjectECRen
dc.titleCorrosion Protection Service Life of Epoxy-Coated Reinforcing Steel in Virginia Bridge Decksen
dc.typeTechnical reporten
dc.type.dcmitypeTexten

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