United States Department of Transportation
i
Degradation Mechanisms and Service Life Estimation for Fiber Reinforced Polymer (FRP) Concrete Reinforcements
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2019-04-01
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[PDF-5.86 MB]
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Edition:Final Report
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Abstract:Fiber-reinforced-polymer (FRP) reinforcement, such as glass and carbon, have emerged as an acceptable construction material for both new constructions as well as for the rehabilitation and strengthening of existing structures. The proven track records of superior performance of FRP materials in terms of strength, durability, resistance to corrosion, and versatility of fabrication have made these materials attractive to civil engineers. This research study aims at investigating glass fiber reinforced polymer (GFRP) bars and carbon fiber prestressing tendons. The research team of this study investigated the physical and mechanical properties, and durability to concrete of the FRP composites. For GFRP bars and CFRP prestressing tendons, the research team investigated the physical characteristics, tensile properties, and long-term durability in alkaline solution and elevated temperatures under sustained load and without load. The investigated physical characteristics included the fiber content, thermal expansion, void content, water absorption, glass transition temperature Tg, and cure ratio. Scanning electronic microscopy (SEM) analysis, tensile properties tests, shear strength tests in high pH under sustained load and without load, and other tests for GFRP and CFRP reinforcements were performed. In addition, the investigators studied the structural behavior of concrete beams prestressed with CFRP strands. The researchers conducted comparisons between the predicted and experimental ultimate load, strains, and deflection. The researchers analyzed the results and drew conclusions regarding the FRP performance.
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