Effect of chloride penetration on CFRP sheet, CFRP‐concrete interface, and CFRP‐strengthened concrete beams

Author:

Wang Penggang12,Han Xiaofeng1,Wang Yutian13,Jiang Fuxiang12,Zhao Tiejun12,Yin Yanbo4

Affiliation:

1. Department of Civil Engineering Qingdao University of Technology Qingdao People's Republic of China

2. Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao People's Republic of China

3. Qingdao Lizheng Construction Technology Co., Ltd. Qingdao People's Republic of China

4. Qingdao Fuying Design Consulting Co., Ltd. Qingdao People's Republic of China

Abstract

AbstractWhether the performance of carbon fiber‐reinforced polymer (CFRP)‐strengthened concrete structure is affected by chloride penetration is the key to the application under chloride environments. In this paper, the effect of chloride penetration on tensile properties of CFRP sheet, bond behavior of CFRP‐concrete, and flexural performance of CFRP‐strengthened concrete beams were studied. Results show that chloride penetration has no effect on the elastic modulus of the CFRP sheet. The tensile strength and elongation of the CFRP sheet decrease with the exposure time increase, reducing by 10% and 12.7% after 240 days. The interface failure of CFRP‐concrete is likely to occur on the concrete surface. As the exposure time increases, the interface failure develops toward the epoxy resin layer; the sliding stiffness and end slip of the interface decrease. However, the ultimate bearing capacity of the interface first increases and then decreases. As the exposure time increase, the effective bonding length gradually increases, and the failure mode of CFRP‐strengthened beams changes from bending failure to shear failure. After 120 days, the ultimate bearing capacity of the beams is significantly reduced. From three parts of materials, interfaces, and components to provide an evaluation basis for the use, regular detection, and life prediction of CFRP‐strengthened reinforced concrete beams under chloride environments.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Mechanics of Materials,General Materials Science,Building and Construction,Civil and Structural Engineering

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