| Summary: | 碩士 === 國立中興大學 === 土木工程學系所 === 94 === The concrete structures after damage often need to be strengthened. The bond between the repair material and original concrete is the key factor to determine the repair quality. In this research, concrete structures were strengthened with CFRP (Carbon Fiber-Reinforced Polymer). Both normal concrete and concrete after fire damage were considered as strengthening specimens. To simulate bad bond quality, thin and thick plastic sheets were placed at specific locations at the interface between CFRP and concrete. The infrared thermography technique was used to inspect the repair quality of concrete structures strengthened by CFRP. The number of CFRP layers and the heating source were considered as experimental parameters. In addition, how the thickness of the flaw affects the temperature distribution on the surface detected by the infrared will be studied. Finally, the results obtained from numerical analysis were compared with the experimental results.
The experimental results show that both the sunlight and halogen light are suitable heating source for detection of the flaws at the interface between CFRP and concrete in the thermal image. It was found that the thicker the flaw thickness the higher the surface temperature. For the same number of CFRP layers, a longer duration of heating results in a higher surface temperature on the top of the flaw. The flaw surface temperature and the temperature decreasing rate are reduced by increasing the number of CFRP layers. The infrared thermography is still valid for detection of flaws beneath CFRP with three layers. The numerical results show the similar heat flow phenomenon to that observed in the experimental results. It is concluded that application of infrared thermography to repair quality inspection of concrete structures strengthened by CFRP is highly feasible
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