Evaluates cure distribution in GFRP plates, highlighting implications for infrastructure repair and maintenance.
In recent years, the increase of aging infrastructure facilities has become a big issue. To repair aging infrastructure facilities, FRP has been used in construction work because of its superior corrosion resistance and high specific strength. For example, a pipe rehabilitation using GFRP is one of repair methods for sewer pipes. However, because this method involves resin curing underground, there is possibility that uncured areas remain by the cooling effect of underground water. In this study, to evaluate cure distribution in the thickness direction GFRP plates were molded by heating on one side, and though-thickness ultrasonic reflection characteristics were investigated. As a result, it was found that the thickness of uncured layer can be predicted by ultrasonic propagation velocity and ultrasonic reflection characteristics. In addition, it was confirmed that uncured resin included even in areas that appear to be in the cured layer.
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KASHIHARA et al. (2025) studied this question.
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