Interface bonding characteristics of the Cured-in-Place Pipe lined steel plates and parameter sensitivity analysis

• Published in: Structures (Oxford) 2024-11, Vol.69, p.107574, Article 107574
• Main Authors: Wang, Hao, Li, Bin, Fang, Hongyuan, Du, Xueming, Wang, Niannian, Zang, Quansheng, Di, Danyang
• Format: Article
• Language: English
• Subjects: Bonding characteristics; CIPP; Sensitivity analysis; Tensile test; Trenchless rehabilitation; Water supply pipes
• ISSN: 2352-0124; 2352-0124
• DOI: 10.1016/j.istruc.2024.107574

CIPP liners have been successfully applied in trenchless rehabilitation of water supply pipelines. However, the negative pressure effects within these pipelines can lead to buckling failure of the liner. The bonding characteristics at the interface between the liner and the host pipe are critical to addressing this issue. In this study, the water steel pipe was modeled as a flat steel plate (PS), and the normal bonding characteristics at the CIPP-PS interface were investigated under various factors using a self-designed tensile testing device. A multi-factor calculation equation of the peak tensile force at the CIPP-PS interface was proposed, and the sensitivity of each factor affecting the normal bonding characteristics was assessed. The results indicate that the normal bond failure behavior of the CIPP-PS interface is highly consistent with the tensile behavior of ductile polymers. Increasing the interface area (1.0 dm² - 4.0 dm²), roughness (0.8 µm - 25 µm), tensile rate (0.2 mm/min - 1.8 mm/min), pressure holding time (0 h - 48 h), and liner thickness (4 mm - 20 mm) increased the peak tensile force by 466.2 %, 358.9 %, 178.4 %, 83.9 %, and 51.5 %, respectively. However, increasing the curing time (5 days to 13 days) and curing temperature (5 °C - 45 °C) decreased the peak tensile force by 63.8 % and 70.2 %, respectively. Compared to the intact standard condition, when the corrosion radius is 35 mm, and the corrosion depth is 7 mm, the peak tensile force decreases by 77.8 % and 52.7 %, respectively. Tensile rate and interface area are high sensitivity factors with |SN| values of 1.991 and 1.353, respectively. Curing time, curing temperature, roughness, liner thickness, and corrosion radius are sensitivity factors with |SN| values ranging from 0.657 to 0.210. Corrosion depth and pressure holding time are moderately sensitive factors with |SN| values of 0.142 and 0.054, respectively.