Effective Repair for Corrosion Control Using FRP Wraps
Publication: Journal of Composites for Construction
Volume 14, Issue 4
Abstract
This paper presents results from a multiyear study to evaluate the role of prewrap substrate preparation on corrosion mitigation in a marine environment. Seventeen one-third scale prestressed piles were corroded to 20% metal loss to simulate severe corrosion. Subsequently, two types of prewrap substrate preparation were carried out: (1) full repair in which the delaminated concrete was removed and the section reformed and (2) epoxy injection repair in which the cracks were sealed and the surface cleaned. Specimens were then wrapped using carbon fiber-reinforced polymer (CFRP) and exposed to simulated tidal cycles at for 28 months. The postexposure wrap performance was evaluated from gravimetric testing in which the metal loss in all specimens was measured. Results showed that the performance of the full repair and the epoxy injection were comparable with relatively minor increased steel loss despite the severity of the exposure. In contrast, the steel in unwrapped controls exposed to the same environment was totally corroded in several regions. The findings provide compelling evidence that epoxy sealing of cracks followed by FRP wrapping is effective even when corrosion damage is severe.
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Acknowledgments
This study was performed in cooperation and funding from the State of Florida and U.S. Department of Transportation. This support is gratefully acknowledged. The assistance and guidance of Mr. Jose Garcia and Mr. Steve Womble from the FDOT is gratefully acknowledged. The writers thank SDR Engineering, Tallahassee for their contribution.
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© 2010 ASCE.
History
Received: Jun 30, 2009
Accepted: Nov 14, 2009
Published online: Jul 15, 2010
Published in print: Aug 2010
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