碳纤维织物与高延性混凝土黏结性能试验

Experimental on the bond behavior between carbon textile and highly ductile concrete

  • 摘要: 为研究碳纤维织物与高延性混凝土(HDC)的黏结性能,设计了24组黏结试件,通过双向拉拔试验,研究了聚乙烯(PE)纤维掺量、PE纤维长径比、基体强度和碳纤维织物表面浸胶程度对黏结性能的影响。结果表明:PE纤维的掺入使织物与基体界面的峰值拔出力和平均黏结强度提高了40.4%~123.7%,且提高幅度随PE纤维掺量的增大而增大;长径比较大的PE纤维改善作用较强;峰值拔出力和平均黏结强度随基体强度的增大而提高,且提高幅度高达148.6%;表面浸胶程度较少的织物与HDC黏结性能较好。基于试验结果,建立了考虑PE纤维掺量、PE纤维长径比、基体强度和织物表面浸胶程度影响的三线型黏结-滑移模型,该模型考虑了纬向纤维束约束作用的贡献,且与试验结果吻合较好,可为纤维织物增强HDC材料的设计与优化提供理论依据。

     

    Abstract: To investigate the bond behavior between carbon textile and highly ductile concrete (HDC), 24 sets of bond specimens were designed. The effects of polyethylene (PE) fiber content, PE fiber aspect ratio, matrix strength, and carbon textile surface impregnation degree on bond behavior were studied through double-sided pull-out tests. The results indicate that the incorporation of PE fibers enhances the peak pull-out force and average bond strength at the textile/matrix interface by 40.4% to 123.7%, with the enhancement magnitude increasing with PE fiber content. PE fibers with higher aspect ratios demonstrate superior improvement effects. Peak pull-out force and average bond strength increase with matrix strength, with enhancement magnitudes reaching up to 148.6%. Textiles with lower surface impregnation degrees exhibit better bond behavior with HDC. Based on experimental results, a tri-linear bond-slip model was established that considers the effects of PE fiber content, PE fiber aspect ratio, matrix strength, and textile surface impregnation degree. This model accounts for the contribution of weft fiber bundles' constraining effect and shows good agreement with the experimental results, providing a theoretical foundation for the design and optimization of textile reinforced HDC materials.

     

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