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The incorporation of fiber-reinforced polymer (FRP) bars as internal reinforcement has become an optimal alternative to conventional reinforcing steel bars due to their innate corrosion resistance and high tensile strength. Storing substances like Liquefied Natural Gas (LNG), Liquid Nitrogen (LN2), and Liquid Oxygen (LOX) at temperatures as low as - 170 °C (− 274 °F) demand specialized equipment and materials. Understanding the behavior of glass fiber-reinforced polymer (GFRP) reinforcing bars in extreme cold is crucial. This paper demonstrates the behavior of FRP bars in extreme cold to investigate the thermal stability, ultimate elongation, and modulus of GFRP bars. It evaluates the mechanical properties of twelve sand-coated GFRP bars (#3; Ab = 71 mm2 and #4; Ab = 129 mm2) tested at - 170 °C (− 274 °F) and room temperature 25 °C (77 °F) as reference specimens. Microstructural analysis using scanning electronic microscopy (SEM) and physical measurements via thermogravimetric analysis (TGA) assess the deterioration of the fiber, matrix, and the fiber/matrix interface due to extreme cold. The test results indicate that the transition from room temperature to an extremely cold temperature may affect the FRP bars in two manners. Firstly, it increases the modulus and rigidity of the material, primarily the resin, enhancing mechanical properties. Secondly, dimensional changes occur due to the shrinkage of the two phases.

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Mechanical Properties of Sand-Coated GFRP Bars Subjected to Extreme Cold Temperatures Down to – 170 °C (− 274 °F)

  • 会议论文

  • 发表日期：

    2025年

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  • Ibrahim Zidan,
  • Mohammed Gamal Gouda,
  • Patrice Cousin,
  • Khaled Mohamed,
  • Brahim Benmokrane

摘要

The incorporation of fiber-reinforced polymer (FRP) bars as internal reinforcement has become an optimal alternative to conventional reinforcing steel bars due to their innate corrosion resistance and high tensile strength. Storing substances like Liquefied Natural Gas (LNG), Liquid Nitrogen (LN2), and Liquid Oxygen (LOX) at temperatures as low as - 170 °C (− 274 °F) demand specialized equipment and materials. Understanding the behavior of glass fiber-reinforced polymer (GFRP) reinforcing bars in extreme cold is crucial. This paper demonstrates the behavior of FRP bars in extreme cold to investigate the thermal stability, ultimate elongation, and modulus of GFRP bars. It evaluates the mechanical properties of twelve sand-coated GFRP bars (#3; Ab = 71 mm2 and #4; Ab = 129 mm2) tested at - 170 °C (− 274 °F) and room temperature 25 °C (77 °F) as reference specimens. Microstructural analysis using scanning electronic microscopy (SEM) and physical measurements via thermogravimetric analysis (TGA) assess the deterioration of the fiber, matrix, and the fiber/matrix interface due to extreme cold. The test results indicate that the transition from room temperature to an extremely cold temperature may affect the FRP bars in two manners. Firstly, it increases the modulus and rigidity of the material, primarily the resin, enhancing mechanical properties. Secondly, dimensional changes occur due to the shrinkage of the two phases.