Corrosion Reduction in Lightweight Concrete with Fiber Reinforced Polymer Wrapping

Eric Goucher, Nur Yazdani

Abstract


Lightweight concrete is being increasingly used in exposed environments such as bridge decks, to reduce the dead load. The literature on externally bonded FRP application on lightweight concrete is sparse, especially in the durability aspects. The purpose of this study was to investigate the effect of Fiber Reinforced Polymer (FRP) wrap on reducing corrosion of steel rebars in lightweight concrete. Forty two concrete cylinders were subjected to electricity induced accelerated testing in a saline solution for 50 days. Samples were removed from the immersion tank after specific failures and analyzed for rebar mass loss and failure modes. The results indicated that both lightweight (LW) and normal weight (NW) concrete greatly benefited from FRP wrapping in terms of increased time to failure and reduced rebar mass loss. LW concrete generally performed better with Carbon FRP wrapping, and NW concrete with Glass FRP. Multiple wraps were more effective at reducing corrosion than single wraps. LW concrete may have greater chloride permeability reductions, whereas NW concrete may have benefited more from confinement effects of the FRP. The majority of failures were cracking in the concrete substrate. The study showed that FRP wrapping can significantly reduce steel corrosion in LW concrete, thereby increasing the long-term durability.

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References


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MAYFEB Journal of Materials Science
MAYFEB TECHNOLOGY DEVELOPMENT
Toronto, Ontario, Canada
ISSN 2371-8722