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Incorporating fibers into concrete can significantly enhance its mechanical properties, particularly when using carbon fibers. Carbon fiber is widely recognized for its capability to maintain the remaining load-carrying capacity and structural integrity of concrete even under high-temperature conditions. However, there is a scarcity of experimental studies on Carbon Fiber Reinforced Concrete (CFRC) that have been subjected to the combined effect of high temperature and high strain rate, mainly due to testing limitations. This study aimed to analyze the response of CFRC specimens to the combined effect of fire and impact loading. To systematically investigate the dynamic properties, this study utilized the Split Hopkinson Pressure Bar (SHPB) and a heating furnace. The dynamic properties of three different concrete mixture specimens, with carbon fiber contents of 0%, 1%, and 2%, were assessed across a temperature range of 200 °C to 800 °C. The experimental results showed that CFRC exhibited significant strain rate strengthening effects, as evidenced by improvements in its dynamic compressive strength, peak strain, and pre-peak dynamic stress toughness. In conclusion, CFRC specimens demonstrate superior impact resistance compared to ordinary concrete.

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Experimental Study on Dynamic Compressive Behaviors of Carbon Fiber Reinforced Concrete Under High Temperatures

  • 会议论文

  • 发表日期：

    2025年

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  • Zichen Wang,
  • Liang Li,
  • Jun Wu

摘要

Incorporating fibers into concrete can significantly enhance its mechanical properties, particularly when using carbon fibers. Carbon fiber is widely recognized for its capability to maintain the remaining load-carrying capacity and structural integrity of concrete even under high-temperature conditions. However, there is a scarcity of experimental studies on Carbon Fiber Reinforced Concrete (CFRC) that have been subjected to the combined effect of high temperature and high strain rate, mainly due to testing limitations. This study aimed to analyze the response of CFRC specimens to the combined effect of fire and impact loading. To systematically investigate the dynamic properties, this study utilized the Split Hopkinson Pressure Bar (SHPB) and a heating furnace. The dynamic properties of three different concrete mixture specimens, with carbon fiber contents of 0%, 1%, and 2%, were assessed across a temperature range of 200 °C to 800 °C. The experimental results showed that CFRC exhibited significant strain rate strengthening effects, as evidenced by improvements in its dynamic compressive strength, peak strain, and pre-peak dynamic stress toughness. In conclusion, CFRC specimens demonstrate superior impact resistance compared to ordinary concrete.