United States Department of Transportation
i
I-10 Girder Repair Using Post-Tensioned Steel Rods and Carbon Fiber Composite Cables (CFCC): Research Project Capsule
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2013-08-01
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By Tsai, Ching
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Abstract:The I-10 Littlewood Bridge is a two-bound 250-ft. span prestressed concrete girder bridge. Each bound consists of six prestressed cornet girders. Portions of the girders have been submerged in relatively stagnant water since completion of construction. As a result, these girders experienced severe corrosion in the prestress strands and spalling of the concrete in the submerged portion of the girders. Several of the strands were observed to be broken. The Louisiana Department of Transportation and Development (DOTD) decided to externally reinforce the girders to ensure the safety of the bridge. The external reinforcement consisted of steel reinforcing bars. There was a concern on the use of unprotected steel reinforcing bars that will be exposed to a wet environment most of the time. It was determined that one of the spans (all six girders) would be reinforced with carbon fi ber composite cables (CFCC) due to their excellent corrosion resistance property. A 30 kips tension was applied to the CFCC cables. Results from a previously funded study, LTRC 07-3ST, titled “Repairing/Strengthening of Bridges with Post-tensioned FRP Materials and Performance Evaluation,” where theoretical work was performed and CFCC was used as a reinforcing system designed to strengthen a load posted bridge, were used on this current project.
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