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Open AccessArticle

Experimental Investigation of Fatigue Debonding Growth in FRP–Concrete Interface

1
School of Civil Engineering, Southeast University, Nanjing 210096, China
2
Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1459; https://doi.org/10.3390/ma13061459
Received: 11 February 2020 / Revised: 18 March 2020 / Accepted: 20 March 2020 / Published: 23 March 2020
(This article belongs to the Special Issue Carbon Fiber Reinforced Polymers)
An externally bonded fiber reinforced polymer (FRP) plate (or sheet) is now widely used in strengthening bending members due to its outstanding properties, such as a high strength to weight ratio, easy operating, corrosion and fatigue resistance. However, the concrete member strengthened by this technology may have a problem with the adhesion between FRP and concrete. This kind of debonding failure can be broadly classified into two modes: (a) plate end debonding at or near the plate end, and (b) intermediate crack-induced debonding (intermediate crack-induced (IC) debonding) near the loading point. The IC debonding, unlike the plate end debonding, still needs a large amount of investigation work, especially for the interface under fatigue load. In this paper, ten single shear pull-out tests were carried out under a static or fatigue load. Different load ranges and load levels were considered, and the debonding growth process was carefully recorded. The experimental results indicate that the load range is one of the main parameters, which determines the debonding growth rate. Moreover, the load level can also play an important role when loaded with the same load range. Finally, a new prediction model of the fatigue debonding growth rate was proposed, and has an excellent agreement with the experimental results. View Full-Text
Keywords: carbon fiber reinforced polymer (CFRP); adhesion; interface; pull-out test; fatigue; debonding growth carbon fiber reinforced polymer (CFRP); adhesion; interface; pull-out test; fatigue; debonding growth
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MDPI and ACS Style

Min, X.; Zhang, J.; Wang, C.; Song, S.; Yang, D. Experimental Investigation of Fatigue Debonding Growth in FRP–Concrete Interface. Materials 2020, 13, 1459.

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