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Abstract
AbstractAn experimental and analytical investigation of the fracture performance of glass fiber-reinforced polymer (GFRP) bars embedded in concrete beams with cracks is presented. Beams with cracks were conditioned with sustained flexural loads in outdoor, 60°C-alkaline solution, and tap water environments for up to 9 months, after which they were subjected to eccentric three-point flexure tests to evaluate fracture performance and microscopic tests to analyze the changes in microscopic structures through scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry (DSC). The results showed that the cracks aggravated the influence of the environments on GFRP-RC beams but did not change the mechanisms of mechanical degradation of the GFRP bars. Based on the research conclusions, the same durability tests and eccentric three-point flexure tests were conducted to determine the permissible crack values and treatment recommendations for GFRP-RC beams...
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