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Troubled Bridge Over Salt Water

From JPCL, October 2017

More items for Program/Project Management

By Michael O. Woodward, Carboline Company

Surrounded by high-rise buildings and crossing the Miami River, the Miami Avenue Bridge spans a heavily utilized waterway for recreational crafts, cargo vessels and private yachts leading to and from the Atlantic Ocean. This case history describes recoating this bridge after the discovery of a catastrophic, intercoat delamination failure....


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Tagged categories: Adhesion; Bridges; Case History; Coating selection; Cost-savings; Epoxy; Overcoating; Project Management; Specification; Waterjetting

Comment from Gordon Kuljian, (11/6/2017, 10:37 AM)

Nice success story. I'd like to learn what caused the original inter-coat failure, and how was the water-jetting effluent contained/treated/etc.


Comment from Michael Woodward, (11/8/2017, 9:54 AM)

The inspection was primarily completed to determine the soundness of the existing IOZ primer as an over coat candidate in order to optimize the re-painting process and minimize downtime of the bridge spans. By time the inspection was completed on the failing coating it was not feasible to determine the mode of failure. Potential causes included: missed recoat window between IOZ primer and epoxy intermediate; application of epoxy intermediate over contaminated primer; mis-catalyzed epoxy intermediate; or possibly even moisture contamination of the intermediate coat during cure. The contractor built containment's to catch effluent and funneled it to sumps for collection, removal and disposal.


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