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Abstract In case of onshore structures such as bridges and elevated roads, repairs and reinforcements by carbon fiber reinforced plastics (CFRPs) have been in practical use for the damaged or deteriorated parts. However, in the other case of maritime structures, ship hulls and offshore structures are operated under conditions exposed to salt water and repeated cycles of drying and wetting, which is an even more severe corrosive environment than onshore structures. Furthermore, during repairs and constructions, it is necessary to suspend operation and usage, and it is undesirable to take a long time in the environment such as waves and wind. Therefore, it is necessary to minimize and simplify the working time required for repairs as much as possible. CFRP strand sheets are reinforcement materials made by processing carbon fiber strands impregnated with resin into a blind-like shape, and they excel in workability as the impregnation of adhesive resin is fast during the adhesive construction to steel materials. If this repair and reinforcement method using CFRP strand sheets can be applied to ship hulls and marine structures, rapid repairs by manpower or operating machine are possible, leading to improved operational efficiency. In this study, the degree of corrosive degradation caused by seawater immersion when CFRP strand sheets are used as reinforcements is verified experimentally, and the applicability of CFRP repair and reinforcement to ship hulls and offshore structures is investigated.
Matsuo et al. (Sun,) studied this question.