Effects of diameter on the durability of glass-fiber-reinforced-polymer (GFRP) bars conditioned in alkaline solution
Article
Article Title | Effects of diameter on the durability of glass-fiber-reinforced-polymer (GFRP) bars conditioned in alkaline solution |
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ERA Journal ID | 4221 |
Article Category | Article |
Authors | Benmokrane, Brahim (Author), Manalo, Allan (Author), Bouhet, Jean-Charles (Author), Mohamed, Khaled (Author) and Robert, Mathieu (Author) |
Journal Title | Journal of Composites for Construction |
Journal Citation | 21 (5), pp. 1-12 |
Number of Pages | 12 |
Year | 2017 |
Publisher | American Society of Civil Engineers |
Place of Publication | Reston, VA, USA |
ISSN | 1090-0268 |
1943-5614 | |
Digital Object Identifier (DOI) | https://doi.org/10.1061/%28ASCE%29CC.1943-5614.0000814 |
Web Address (URL) | https://ascelibrary.org/doi/pdf/10.1061/%28ASCE%29CC.1943-5614.0000814 |
Abstract | Current standards do not consider the diameter of glass-fiber-reinforced-polymer (GFRP) bars used as internal reinforcement in concrete structures to be a factor influencing bar durability. This paper investigates the effects of bar diameter on the physical and mechanical properties as well as the durability of GFRP reinforcing bars conditioned for three months at 60°C in an alkaline solution simulating a concrete environment. Five diameters (nominal diameters of 9.5 mm, 12.7 mm, 15.9 mm, 19.1 mm, and 25.4 mm) were considered; bar properties were assessed before and after conditioning. Microstructural analyses and measurement of physicochemical properties were also carried out. The results show that bar size had no significant effect on bar physical properties, except for water absorption. The smaller diameter bars had higher water absorption than the larger ones due to their higher surface-area-to-volume ratios. In the case of the unconditioned bars, the tensile strength and modulus were not significantly affected by bar diameter, but there was a size effect for interlaminar shear strength and flexural strength. On the other hand, the conditioning in the alkaline solution had a greater negative effect on the tensile strength of the larger bars than on the smaller ones. Scanning-electron-microscope (SEM) observations and Fourier-transform-infrared-spectroscopy (FTIR) analysis revealed that the degradation remained at the surface of all the conditioned specimens. Nevertheless, there were only small variations between the physical and mechanical properties of the GFRB bars of different diameters. This indicates that the current provisions in standards that do not relate strength-retention limit to bar size are acceptable. |
Keywords | GFRP reinforcing bars; diameter; durability; mechanical; properties retention; alkaline environment, concrete |
ANZSRC Field of Research 2020 | 400510. Structural engineering |
400505. Construction materials | |
401602. Composite and hybrid materials | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Sherbrooke, Canada |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q492q/effects-of-diameter-on-the-durability-of-glass-fiber-reinforced-polymer-gfrp-bars-conditioned-in-alkaline-solution
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