Long-Term Performance of GFRP Reinforcement: Technical Report

作者: Jason Zidek , Paolo Gardoni , Jeong Joo Kim , David Trejo

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摘要: Significant research has been performed on glass fiber-reinforced polymer (GFRP) concrete reinforcement. This shown that GFRP reinforcement exhibits high strengths, is lightweight, can decrease time of construction, and corrosion resistant. Regarding the resistance, chemical reactions occur in bars do not result expansive products—products damage surrounding Although classical steel corrosion, much shows reinforcing corrode, reducing tensile capacity as a function time. The American Concrete Institute (ACI) recognized this places reduction factor allowable design strength bars. A drawback majority have typically directly exposed to aggressive solutions, exposure conditions possibly similar they would encounter while embedded concrete. Limited evaluating concrete; however, these were only for relatively short durations. investigated characteristics 7 years mean annual temperature 69°F (23°C) an average precipitation 39.7 in. (1008 mm), fairly evenly distributed throughout year. Three manufacturers provided #5 #6 research. Results indicate exhibit reduced capacities when model was developed assess based general diffusion model, where water or ions penetrate bar matrix degrade fibers. dependent time, material, radius bar. indicates with larger diameters lower rates loss. However, times required drop below ACI requirements #3, #5, less than 6 years. Further needed determine how will affect GFRP-reinforced structures; consideration changing requirement may be warranted.

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