Bond Properties of Carbon Fiber Reinforced Polymer and Corrosion-Cracked Reinforced Concrete Interface: Experimental Test and Nonlinear Degenerate Interface Law

• Published in: Materials Vol. 14; no. 18; p. 5333
• Main Authors: Gong, Yongzhi, Shan, Yingjie, Wu, Yuyuan, Wang, Liping, Liu, Xiaojie, Ding, Faxing
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 15.09.2021; MDPI
• Subjects: Adhesives; Bearing capacity; Bond strength; Carbon fiber reinforced concretes; Carbon fiber reinforced plastics; Carbon fiber reinforcement; Cement; CFRP to concrete interface; Concrete mixing; Concrete properties; Concrete structures; corrosion; Corrosion effects; Corrosion tests; Curing; double shear lap test; effective bond length; Experimentation; Fiber reinforced polymers; Mechanical properties; nonlinear degenerate law; Parametric analysis; Reinforced concrete; Reinforcing steels; Sheets; Strain gauges; Stress corrosion cracking
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma14185333

Existing experimental research on bond properties of the interface between Carbon Fiber Reinforced Polymer (CFRP) and damaged concrete is limited, although CFRP strengthening technology has been widely used for corroded reinforced concrete structures. This work investigated the bond behavior of CFRP to the corrosion-cracked concrete interface, in which three factors were considered for experimentation, including corrosion degree, concrete strength and concrete cover thickness. The tests were conducted by developing a self-balancing double shear lap test device. In addition, a corrosion scene was provided simultaneously to simulate the external corrosion environment. The results showed that three peeling modes of CFRP sheets were observed with respect to corrosion degrees of the steel bars. The effects of the three factors on the stripping bearing capacity and effective bond length of CFRP sheets were discussed by systematic parametric analysis. Finally, a nonlinear degenerate law of CFRP-to-concrete interface considering the corrosion degree was improved and verified in this study.