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Smart Structures and Systems Volume 17, Number 4, April 2016 , pages 593-610 DOI: https://doi.org/10.12989/sss.2016.17.4.593 |
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New emerging surface treatment of hybrid GFRP bar for stronger durability of concrete structures |
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Cheolwoo Park, Younghwan Park, Seungwon Kim and Minkwan Ju
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| Abstract | ||
| In this study, an innovative and smart glass fiber-reinforced polymer (GFRP) hybrid bar was developed for stronger durability of concrete structures. As comparing with the conventional GFRP bar, the smart GFRP Hybrid bar can promise to enhance the modulus of elasticity so that it makes the cracking reduced than the case when the conventional GFRP bar is used. Besides, the GFRP Hybrid bar can effectively resist the corrosion of conventional steel bar by the GFRP outer surface on the steel bar. In order to verify the bond performance of the GFRP hybrid bar for structural reinforcement, uniaxial pull-out test was conducted. The variables were the bar diameter and the number of strands and pitch of the fiber ribs. Tensile tests showed a excellent increase in the modulus of elasticity, 152.1 GPa, as compared to that of the pure GFRP bar (50 GPa). The stress–strain curve was bi-linear, so that the ductile performance could be obtained. For the bond test, the entire GFRP hybrid bar test specimens failed in concrete splitting due to higher shear strength resulting in concrete crushing as a function of bar deformation. Investigation revealed that an increase in the number of strands of fiber ribs enhanced the bond strength, and the pitch guaranteed the bond strength of D19 (D16) bar specimens may be around 13.4 mm. For a comparative study using two representative code equations, the ACI 440 1R-15 equation is regarded as more suitable for predicting the bond strength of GFRP hybrid bars, whereas the CSA S806-12 prediction is considered too conservative and is largely influenced by the bar diameter. For further study, various geometrical and material properties such as concrete cover, cross-sectional ratio, and surface treatment should be considered. | ||
| Key Words | ||
| GFRP hybrid bar; durability; modulus of elasticity; bond test; code equations | ||
| Address | ||
| Cheolwoo Park,Seungwon Kim and Minkwan Ju: Department Of Civil Engineering, Kangwon National University, 346 Joongang-ro, Samcheok-si, Kangwon, 25913, Korea Younghwan Park: Division of Structural Engineering Research, Korea Institute of Construction Technology, 315 Goyang-dae-ro, Ilsan-seo-gu, Goyang-si, Gyenggi-Do, 10223, Korea | ||