Evaluation of physical and durability characteristics of new headed glass fiber–reinforced polymer bars for concrete structures
Article
Article Title | Evaluation of physical and durability characteristics of new headed glass fiber–reinforced polymer bars for concrete structures |
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ERA Journal ID | 4221 |
Article Category | Article |
Authors | Benmokrane, Brahim (Author), Mohamed, Hamdy M. (Author), Manalo, Allan (Author) and Cousin, Patrice (Author) |
Journal Title | Journal of Composites for Construction |
Journal Citation | 21 (2), pp. 1-12 |
Number of Pages | 12 |
Year | 2017 |
Publisher | American Society of Civil Engineers |
Place of Publication | United States |
ISSN | 1090-0268 |
1943-5614 | |
Digital Object Identifier (DOI) | https://doi.org/10.1061/(ASCE)CC.1943-5614.0000738 |
Web Address (URL) | http://ascelibrary.org/doi/pdf/10.1061/(ASCE)CC.1943-5614.0000738 |
Abstract | This paper presents the results of a collaborative research project with Quebec’s Ministry of Transportation and the Ontario’s Ministry of Transportation, which aimed at characterizing a new type of headed glass-fiber-reinforced-polymer (GFRP) reinforcing bar and evaluating its suitability as internal reinforcement for concrete structures. To achieve these objectives, the project was implemented in three stages: (1) evaluation of the physical and mechanical properties; (2) determination of the pullout behavior in concrete; and (3) characterization of the long-term durability of the headed GFRP bars. A total of 57 specimens embedded in a 200 mm concrete cube were tested with the direct pullout test to investigate the effect of confinement, bar size, concrete compressive strength, and exposure conditions on the pullout behavior of the headed GFRP bars. Simultaneously, microstructural analyses and measurements of the physicochemical and mechanical properties were carried out on conditioned and unconditioned headed GFRP bars. The results show that the materials, geometry, and interface configuration of the head provided very good mechanical interlocking to the GFRP bars. Up to 63% and 53% of the guaranteed tensile strength of the straight GFRP bars were achieved for 15.9 mm and 19 mm diameter bars with headed ends, respectively. Scanning electron microscopy and differential scanning calorimetry showed no material changes in the head and bars after exposure to alkaline solution and freeze–thaw cycling. Exposure to the alkaline solution under sustained loading had the most detrimental effect, with the bar retaining 79.4% of its pullout strength. The results indicate that the tested headed GFRP bar has suitable mechanical and durability properties for use as reinforcement in concrete bridge components. |
Keywords | Glass-fiber-reinforced polymer; headed bar; physical; mechanical; durability; freeze-thaw, alkaline environment, concrete, pullout strength |
ANZSRC Field of Research 2020 | 400505. Construction materials |
400510. Structural engineering | |
401602. Composite and hybrid materials | |
401609. Polymers and plastics | |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Byline Affiliations | University of Sherbrooke, Canada |
Centre of Excellence in Engineered Fibre Composites | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q397x/evaluation-of-physical-and-durability-characteristics-of-new-headed-glass-fiber-reinforced-polymer-bars-for-concrete-structures
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