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Open AccessArticle

Influence of Roughness on Shear Bonding Performance of CFRP-Concrete Interface

by 1,2,* and 1
1
Department of Civil Engineering, Dalian Maritime University, Dalian 116026, China
2
Liaoning Provincial College of Communications, Shenyang 110122, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(10), 1875; https://doi.org/10.3390/ma11101875
Received: 21 August 2018 / Revised: 27 September 2018 / Accepted: 29 September 2018 / Published: 1 October 2018
(This article belongs to the Section Materials Physics)
The potential of Fiber Reinforced Polymer (FRP) in the reinforcement of concrete structures has been shown in many studies and practical applications. However, few works have focused systematically on the development of quantitative criteria to measure surface roughness and relate this parameter to the bonding mechanical property. Moreover, some researchers have declared that, if the concrete interface is rougher, the bond performance between FRP and concrete will be increase, However, there is no answer to how rough the surface is. There are limited application standards for engineers to conduct in FRP reinforcement projects. This work evaluated several concrete specimens with three different strengths and six types of interface roughness. A single shear test was conducted to study the influence of surface roughness on the interfacial bonding performance of a carbon fiber-reinforced composite (CFRP)-concrete beam. The results show that, among the six interfaces, a concrete interface with the roughness of 0.44 has the best interfacial bonding performance. An interfacial appearance with the cement mortar almost cleaned away, and almost one fifth of the single coarse aggregate bared will get the best bond performance. Roughness parameters significantly influenced the effective bond length. The effective bond length of the six interfaces experienced an overall decreasing trend as the roughness increased. The bond–slip curves of concrete interfaces with roughness of 0.25–0.44 did not significantly change the rigidity within the brittle region. The rougher the interface was, the shorter the brittle region was. After entering a plasticity stage, the bond–slip curves for the six types of interfaces all declined with different slopes, and the max slip values were 0.04–0.35 mm when debonding failure occurred. View Full-Text
Keywords: bonding stress; concrete; CFRP; effective bond length; interface; single shear test bonding stress; concrete; CFRP; effective bond length; interface; single shear test
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MDPI and ACS Style

Yin, Y.; Fan, Y. Influence of Roughness on Shear Bonding Performance of CFRP-Concrete Interface. Materials 2018, 11, 1875. https://doi.org/10.3390/ma11101875

AMA Style

Yin Y, Fan Y. Influence of Roughness on Shear Bonding Performance of CFRP-Concrete Interface. Materials. 2018; 11(10):1875. https://doi.org/10.3390/ma11101875

Chicago/Turabian Style

Yin, Yushi; Fan, Yingfang. 2018. "Influence of Roughness on Shear Bonding Performance of CFRP-Concrete Interface" Materials 11, no. 10: 1875. https://doi.org/10.3390/ma11101875

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