Repair of Morganza Spillway Bridge Bent Pile Cap Using Carbon Fiber Reinforcement (CFR). TECH SUMMARY April 2016.

摘要

The pile cap of an end bent of the Morganza Spillway Bridge suff ered extensive damage at the girder bearing locations, particularly on the side where the pounding of the girders by the adjacent concrete deck located on the approach side of the bent. The primary repair of the damaged pile cap and the replacement of the bearing plates were completed by the contractor working on the project. Structural grade high-adhesive material epoxy concrete was utilized to patch the damaged areas of the pile cap. In similar repairs conducted in the past, the patched area under the bearing plates delaminated. In order to prevent this delamination of the repair material, the repaired areas, i.e., the bearing plate locations, were strengthened by confi ning them with high modulus carbon composite wrapping. An inorganic polymer coating that provides UV protection and prevention of deterioration was applied to the entire pile cap surface. This coating also has self-cleaning properties that will prevent and eliminate the growth of any mold or mildew and deposits of organic materials. The project was conducted to demonstrate the application of high strength composites for rehabilitation of transportation infrastructure. Two years of monitoring of the repaired areas has shown no evidence of distress of any kind in either the repair zone or the coating. The inorganic repair system is expected to perform satisfactorily for 10 to 30 years.