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The durability of Externally Bonded Carbon Fiber-Reinforced polymer (EB-CFRP) composites has been widely investigated in the literature, providing insights into their long-term behavior under various environmental conditions. However, the combined effects of environmental factors and sustained loads are less understood, despite their relevance in many applications. In this study, double-shear CFRP-reinforced concrete specimens were exposed to hygrothermal conditions at 40 °C with relative humidity (RH) levels ranging from ~30% to 100%, while a constant 5 kN load was applied using a custom metallic frame equipped with calibrated springs. Residual bond properties were evaluated after different exposure durations up to 12 months. The results reveal that creep effects were minimal under moderate or intermediate moisture levels, while significant bond degradation and premature creep failure occurred under saturated moisture conditions.

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Impact of Hygrothermal Aging and Sustained Load on the Bond Behavior Between EB-CFRP Plates and Concrete

  • 会议论文

  • 发表日期：

    2026年

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  • Corentin Le Roy,
  • Christophe Aubagnac,
  • Marc Quiertant,
  • Karim Benzarti

摘要

The durability of Externally Bonded Carbon Fiber-Reinforced polymer (EB-CFRP) composites has been widely investigated in the literature, providing insights into their long-term behavior under various environmental conditions. However, the combined effects of environmental factors and sustained loads are less understood, despite their relevance in many applications. In this study, double-shear CFRP-reinforced concrete specimens were exposed to hygrothermal conditions at 40 °C with relative humidity (RH) levels ranging from ~30% to 100%, while a constant 5 kN load was applied using a custom metallic frame equipped with calibrated springs. Residual bond properties were evaluated after different exposure durations up to 12 months. The results reveal that creep effects were minimal under moderate or intermediate moisture levels, while significant bond degradation and premature creep failure occurred under saturated moisture conditions.