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International Journal of Polymer Science
Volume 2016, Article ID 5832130, 12 pages
Research Article

Experimental Study on Bond Behavior of FRP-Concrete Interface in Hygrothermal Environment

1School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China
2College of Water Conservancy and Civil Engineering, South China Agriculture University, Guangzhou 510642, China

Received 23 September 2016; Accepted 13 November 2016

Academic Editor: Baolin Wan

Copyright © 2016 X. H. Zheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


As the technique of fiber-reinforced polymer (FRP) composite material strengthened reinforced concrete structures is widely used in the field of civil engineering, durability of the strengthened structures has attracted more attention in recent years. Hygrothermal environment has an adverse effect on the bond behavior of the interface between FRP and concrete. This paper focuses on the bond durability of carbon fiber laminate- (CFL-) concrete interface in hygrothermal condition which simulates the climate characteristic in South China. Twenty 100 mm × 100 mm × 720 mm specimens were divided into 6 groups based on different temperature and humidity. After pretreatment in hygrothermal environment, the specimens were tested using double shear method. Strain gauges bonded along the CFL surface and linear variation displacement transducers (LVDTs) were used to measure longitudinal strains and slip of the interface. Failure mode, ultimate capacity, load-deflection relationship, and relative slip were analyzed. The bond behavior of FRP-concrete interface under hygrothermal environment was studied. Results show that the ultimate bearing capacity of the interface reduced after exposure to hygrothermal environments. The decreasing ranges were up to 27.9% after exposure at high temperature and humidity (60°C, 95% RH). The maximum strains () of the specimens pretreated decreased obviously which indicated decay of the bond behavior after exposure to the hygrothermal environment.