Effect of curing conditions on mode-II debonding between FRP and concrete: A prediction model

Pengcheng Jiao, Sepehr Soleimani, Quan Xu, Lulu Cai and Yuanhong Wang

Abstract

The rehabilitation and strengthening of concrete structures using Fiber-Reinforced Polymer (FRP) materials have been widely investigated. As a priority issue, however, the effect of curing conditions on the bonding behavior between FRP and concrete structures is still elusive. This study aims at developing a prediction model to accurately capture the mode-II interfacial debonding between FRP strips and concrete under different curing conditions. Single shear debonding experiments were conducted on FRP-concrete samples with respect to different curing time t and temperatures T. The J-integral formulation and constrained least square minimization are carried out to calibrate the parameters, i.e., the maximum slip s- and stretch factor n. The prediction model is developed based on the cohesive model and Arrhenius relationship. The experimental data are then analyzed using the proposed model to predict the debonding between FRP and concrete, i.e., the interfacial shear stress-slip relationship. A Finite Element (FE) model is developed to validate the theoretical predictions. Satisfactory agreements are obtained. The prediction model can be used to accurately capture the bonding performance of FRP-concrete structures.

Key Words

FRP-concrete; mode-II debonding; prediction model; cohesive model; Arrhenius relationship

Address

Pengcheng Jiao: Department of Civil and Environmental Engineering, Zhejiang University, Hangzhou 310000, Zhejiang, China Sepehr Soleimani: Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA Quan Xu: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China Lulu Cai: Personalized Drug Therapy Key Laboratory of Sichuan Province, Hospital of the University of Electronic Science and Technology of China and Sichuan Provincial People\'s Hospital, Chengdu 610072, China Yuanhong Wang: Center of Analysis and Testing, Institute of Analytical Chemistry for Life Science, School of Public Health, Nantong University, Nantong 226019, China

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