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Carbon Fiber Reinforced Polymer (CFRP) strengthened steel outdoor and submerged structures could be often exposed to water at a range of temperatures. According to the authors' knowledge, no study has identified the effects of water temperature on bond performance, even though a range of temperatures is experienced by the strengthened structures in different parts of the world. In addition, almost all studies focused on corroded steel strengthened with CFRP have been done on steel exposed to induced accelerated corrosion under laboratory conditions, which is not a correct representation of naturally corroded steel. The micro-level degradation occurs near the rusted surface due to hydrogen release from the corrosion process and may cause heavy degradation of the composite with prolonged exposure to an aggressive environment, which might not be observed from the samples with induced accelerated …