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Infrastructures 2018, 3(4), 44; https://doi.org/10.3390/infrastructures3040044

Evaluation of the Bond-to-Concrete Properties of GFRP Rebars in Marine Environments

1
Department of Civil, Architectural and Environmental Engineering, University of Miami, Coral Gables, FL 33146, USA
2
Department of Civil and Environmental Engineering, Florida State University, Tallahassee, FL 32310, USA
3
Department of Mechanical Engineering, University of the Basque Country, 20018 San Sebastian, Guipuzcoa, Spain
*
Author to whom correspondence should be addressed.
Received: 22 August 2018 / Revised: 26 September 2018 / Accepted: 26 September 2018 / Published: 8 October 2018
(This article belongs to the Special Issue Selected Papers from the REHABEND 2018 Congress)
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Abstract

Increased traffic in combination with growing environmental impacts have led to the accelerated degradation of built infrastructure. In reinforced concrete structures, the corrosion of steel reinforcement is the predominant cause of deterioration. Thus, over the last years the use of glass fiber reinforced polymer (GFRP) composites as internal reinforcement bars (rebars) for concrete structures has been evaluated, and has been proved to be a viable alternative to traditional steel reinforcement mainly due to its tensile strength and non-corrosive nature. However, thus far, the GFRP rebar market is diverse and manufacturers around the world produce GFRP rebar types with different surface enhancements to improve the bond to concrete characteristics. In this study, the bond performance of three dissimilar GFRP rebar types (sand coated, helically grooved and with surface lugs) was evaluated over time in seawater environments, with a focus on the bond strength. Accordingly, specimens were exposed to seawater in circulating chambers at three different temperatures (23 °C, 40 °C and 60 °C) for multiple time periods (60 and 120 days). To evaluate the bond performance, pullout tests were conducted according to ASTM D7913. The results showed that the bond strength varied with the surface enhancement features. However, the bond strength did not vary significantly with exposure time and temperature for all three evaluated rebar types. View Full-Text
Keywords: GFRP rebars; durability; bond; temperature; surface enhancement GFRP rebars; durability; bond; temperature; surface enhancement
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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 (CC BY 4.0).
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Ruiz Emparanza, A.; De Caso Y Basalo, F.; Kampmann, R.; Adarraga Usabiaga, I. Evaluation of the Bond-to-Concrete Properties of GFRP Rebars in Marine Environments. Infrastructures 2018, 3, 44.

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