IN SERVICE PERFORMANCE OF EPOXY COATED STEEL REINFORCEMENT IN BRIDGE DECKS. FINAL REPORT

This report presents the results of an investigation conducted in October 1992 on four of Caltrans oldest decks reconstructed with epoxy coated reinforcing steel (ECR). The decks are located in California's northern mountain region and are subjected to deicing salt application during snow periods. A total of thirty-two concrete cores were removed from the decks. Cores were taken at cracks, delaminated areas, and sound regions. Chloride concentration at the rebar level was obtained for each core, and chloride profiles were developed for the four bridge decks. ECR segments were examined for coating type and thickness, presence of visible defects (holidays), coating disbondment, and percentage of corrosion. Of the thirty-two cores removed, only eight had ECR segments that experienced corrosion. Corrosion morphology consisted of superficial discoloration of the rebar surface, and/or minor loss of metal section. Coating disbondment (loss of coating adherence) occurred to some degree in eleven of the thirty-two ECR segments. Cracking and delamination in the concrete decks did not appear to be the result of ECR corrosion. However, of the eight ECR segments that experienced corrosion, five ECR segments removed from cracks, extending to the rebar level, were more corroded. For the bridge decks in this study, ECR meeting Caltrans Standard Specification (52-102B) provided effective corrosion protection for 7 to 10 years of service in California's northern mountain environment. Drought conditions in existence from 1985 through 1991, however, may have created a less aggressive service environment than could be expected since rainfall, snowfall, and associated deicing salt application were less during that period.

  • Supplemental Notes:
    • Publication date on documentation page is Oct. 1995, but on cover is Dec. 1995.
  • Corporate Authors:

    California Department of Transportation

    Division of New Technology, Materials and Research, 5900 Folsom Boulevard
    Sacramento, CA  United States  95819

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Reis, R A
  • Publication Date: 1995-10

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: 65 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00720141
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/CA/TL-96/01-MINOR, Rept. 65-332-638041-33164, Study No. F93RM01
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 12 1996 12:00AM