Comparative durability of GFRP composite reinforcing bars in concrete and in simulated concrete environments
Article
Article Title | Comparative durability of GFRP composite reinforcing bars in concrete and in simulated concrete environments |
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ERA Journal ID | 21082 |
Article Category | Article |
Authors | Manalo, Allan (Author), Maranan, Ginghis (Author), Benmokrane, Brahim (Author), Cousin, Patrice (Author), Alajarmeh, Omar (Author), Ferdous, Wahid (Author), Liang, Ray (Author) and Hota, Gangarao (Author) |
Journal Title | Cement and Concrete Composites |
Journal Citation | 109, pp. 1-14 |
Article Number | 103564 |
Number of Pages | 14 |
Year | 2021 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0958-9465 |
1873-393X | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cemconcomp.2020.103564 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0958946520300561 |
Abstract | Many studies suggest that the durability of glass-fiber-reinforced-polymer (GFRP) bars in a simulated concrete pore solution is very different than the same bars in an actual concrete environment. This study conducted a comparative evaluation of the durability of GFRP bars in concrete and in simulated concrete environments by investigating their interlaminar shear strength. It focused on evaluating the physical, mechanical, and microstructural properties of GFRP bars subjected to high moisture, saline, and alkaline environments. Bare GFRP bars and cement-embedded GFRP bars were immersed in solutions at different temperatures (23 °C, 60 °C, and 80 °C) and for different exposure times (28, 56, and 112 days). The results show that the percentage water uptake and the apparent diffusivity of the GFRP bars were strongly dependent on the type and temperature of the immersion solution. The interlaminar shear strength of the GFRP bars directly immersed in a solution degraded more significantly than those embedded in concrete and immersed. Moreover, the alkaline solution was more aggressive to the GFRP bars than tap water or saline solution, affecting bar fiber, matrix interface, and chemical structure. As a result of this study, master curves and time-shift factors were developed to correlate the retention of interlaminar shear strength from the accelerated aging test to the service life of GFRP bars in an actual concrete environment. |
Keywords | GFRP composite bars, Concrete embedded bars, Interlaminar shear strength, Comparative durability, Alkaline solution, Time-shift factor |
ANZSRC Field of Research 2020 | 400510. Structural engineering |
401602. Composite and hybrid materials | |
Byline Affiliations | Centre for Future Materials |
University of Sherbrooke, Canada | |
West Virginia University, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q62yy/comparative-durability-of-gfrp-composite-reinforcing-bars-in-concrete-and-in-simulated-concrete-environments
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