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<p>Carbon fiber-reinforced cement mortar (CFRCM) is widely employed in structural reinforcement and health monitoring owing to its high strength and superior electrical conductivity. However, chloride content significantly influences both the mechanical performance and electrical conductivity of CFRCM bundles. In this study, the pull-out tests on CFRCM bundles with chloride concentrations ranging from 0% to 5% were carried out. The results revealed that peak load decreases progressively when chloride content exceeds 1%, while peak displacement remains consistent across all specimens at approximately 0.6&#xa0;mm. Concurrently, the bond strength of the matrix exhibits a gradual decline with increasing chloride content, though the electrical properties of CFRCM bundles remain unaffected by chloride presence. Based on the test outcomes, there was a reduction in the peak load of the previous model design. Furthermore, the prediction accuracy of the modified model has been improved by as much as 86.25%. These findings provide a theoretical foundation for leveraging CFRCM in reinforcement and structural health monitoring of concrete infrastructure exposed to chloride-rich environments.</p>

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Influence of chloride content on the CFRCM bundles during pull-out tests and the modification of its piezoresistive model

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Shiji Sun,
  • Dawei Zhang,
  • Xuhua Lin,
  • Jiaxin Hong,
  • ZhiYu Xie,
  • Yifei Gong

摘要

Carbon fiber-reinforced cement mortar (CFRCM) is widely employed in structural reinforcement and health monitoring owing to its high strength and superior electrical conductivity. However, chloride content significantly influences both the mechanical performance and electrical conductivity of CFRCM bundles. In this study, the pull-out tests on CFRCM bundles with chloride concentrations ranging from 0% to 5% were carried out. The results revealed that peak load decreases progressively when chloride content exceeds 1%, while peak displacement remains consistent across all specimens at approximately 0.6 mm. Concurrently, the bond strength of the matrix exhibits a gradual decline with increasing chloride content, though the electrical properties of CFRCM bundles remain unaffected by chloride presence. Based on the test outcomes, there was a reduction in the peak load of the previous model design. Furthermore, the prediction accuracy of the modified model has been improved by as much as 86.25%. These findings provide a theoretical foundation for leveraging CFRCM in reinforcement and structural health monitoring of concrete infrastructure exposed to chloride-rich environments.