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The combination of glass fiber reinforced polymer (GFRP) and limestone calcinated clay cement (LC3) concrete is expected to exhibit significant merits on the excellent resistance of GFRP against chloride attack and the low-alkaline environment provided by LC3 concrete. This combination aims to mitigate the GFRP degradation and thereby extend the service life of marine structures. However, the underlying mechanism of GFRP-LC3 remains unclear. To address this issue, this study focuses on comprehensively investigating the time-dependent degradation of GFRP in LC3 through conditioning GFRP-LC3 specimens in water baths at temperatures of 23, 40, and 60 ℃ for durations of 21, 45, and 90 days. Both macroscopic tensile testing and microstructural analysis are employed to gain deeper insights. The experimental findings indicate that, when compared to normal concrete (NC), LC3 exhibits reduced aggressiveness towards the embedded GFRP bars due to its lower alkaline content. Nonetheless, GFRP bars still experience fiber corrosion, matrix cracking, and fiber-matrix debonding as a result of alkaline attack from LC3. It is observed that GFRP-LC3 displays a higher tensile strength retention than GFRP-NC under identical environmental conditions. These outcomes contribute to a better understanding of GFRP behavior in the context of LC3, enabling the advanced design and construction of structures with enhanced performance and longevity.

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Microstructure, Mechanical Properties and Long-Term Performance of GFRP Bars Embedded in LC3 Concrete

  • 会议论文

  • 发表日期：

    2025年

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  • Peng Wang,
  • Hongyu Lai,
  • Panxin Gao,
  • Wanye Li,
  • Weiwen Li,
  • Ip Wing Shan,
  • Linyuwen Ke

摘要

The combination of glass fiber reinforced polymer (GFRP) and limestone calcinated clay cement (LC3) concrete is expected to exhibit significant merits on the excellent resistance of GFRP against chloride attack and the low-alkaline environment provided by LC3 concrete. This combination aims to mitigate the GFRP degradation and thereby extend the service life of marine structures. However, the underlying mechanism of GFRP-LC3 remains unclear. To address this issue, this study focuses on comprehensively investigating the time-dependent degradation of GFRP in LC3 through conditioning GFRP-LC3 specimens in water baths at temperatures of 23, 40, and 60 ℃ for durations of 21, 45, and 90 days. Both macroscopic tensile testing and microstructural analysis are employed to gain deeper insights. The experimental findings indicate that, when compared to normal concrete (NC), LC3 exhibits reduced aggressiveness towards the embedded GFRP bars due to its lower alkaline content. Nonetheless, GFRP bars still experience fiber corrosion, matrix cracking, and fiber-matrix debonding as a result of alkaline attack from LC3. It is observed that GFRP-LC3 displays a higher tensile strength retention than GFRP-NC under identical environmental conditions. These outcomes contribute to a better understanding of GFRP behavior in the context of LC3, enabling the advanced design and construction of structures with enhanced performance and longevity.