In-Service Performance of Epoxy Coated Steel Reinforcement in Bridge Decks

摘要

The report presents the results of an investigation conducted in October 1992 onfour 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.