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New emerging surface treatment of GFRP Hybrid bar for stronger durability of concrete structures
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  • Journal title : Smart Structures and Systems
  • Volume 17, Issue 4,  2016, pp.593-610
  • Publisher : Techno-Press
  • DOI : 10.12989/sss.2016.17.4.593
 Title & Authors
New emerging surface treatment of GFRP Hybrid bar for stronger durability of concrete structures
Park, Cheolwoo; Park, Younghwan; Kim, Seungwon; Ju, Minkwan;
 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 19.1 mm diameter hybrid bar with 15.9 mm diameter of core section of deformed steel 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.
 Keywords
GFRP hybrid bar;durability;modulus of elasticity;bond test;code equations;
 Language
English
 Cited by
1.
Response of Glass Fiber Reinforced Polymer (GFRP)-Steel Hybrid Reinforcing Bar in Uniaxial Tension,;;;

International Journal of Concrete Structures and Materials, 2017. vol.11. 4, pp.677-686 crossref(new window)
1.
Cracking control comparison in the specifications of serviceability in cracking for FRP reinforced concrete beams, Composite Structures, 2017, 182, 674  crossref(new windwow)
2.
Response of Glass Fiber Reinforced Polymer (GFRP)-Steel Hybrid Reinforcing Bar in Uniaxial Tension, International Journal of Concrete Structures and Materials, 2017, 11, 4, 677  crossref(new windwow)
3.
Detection of bond failure in the anchorage zone of reinforced concrete beams via acoustic emission monitoring, Smart Materials and Structures, 2016, 25, 7, 075034  crossref(new windwow)
4.
Bond performance of GFRP and deformed steel hybrid bar with sand coating to concrete, Journal of Reinforced Plastics and Composites, 2017, 36, 6, 464  crossref(new windwow)
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