Bond Enhancement - Underwater

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DESCRIPTION: Researchers at the University of South Florida have invented a repair method utilizing FRP resin that greatly enhances bond strength and repair integrity. By use of a vacuum or pressure bagging process, water that might interfere with the bond is expelled, and a pressure of up to one atmosphere is constantly applied throughout the curing time. The result is a vastly superior bond that provides long-lasting support and protection for the supporting pile. This method can be applied to either concrete or wooden piles, making it useful in the maintenance of virtually any aging marine structure. By its clear advantages, this method of repair will serve as an attractive alternative to pile jacketing or replacement. As marine structures (e.g. bridges, piers, dams) age, the submersed piles that support them inevitably suffer damage stemming from the harsh and corrosive environment in which they reside. Consequently, local government agencies charged with maintaining these structures are in dire need of cost-effective and long-lasting repair options for these submerged piles. While the use of fibre-reinforced polymer (FRP) resins for underwater pile repair has become common, these repairs are still plagued with poor performance resulting from entrapped water and low contact pressure while curing. The current FRP repair process relies on pressure exerted on the repair by a tightly wrapped plastic shrink film, which reduces as the curing resin shrinks. ADVANTAGES: Cost-effective and long-term repair of aging bridge, pier, dam, pipeline, and lock support piles By applying this technique with fibre reinforced polymers (FRP), damaged piles can be effectively repaired instead of jacketed or replaced Method is effective on both concrete and wooden piles