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.