Bond Durability of FRP Bars Embedded in Fiber-Reinforced Concrete
Publication: Journal of Composites for Construction
Volume 16, Issue 4
Abstract
A research program was initiated to develop a nonferrous reinforcement system for concrete bridge decks using continuous fiber-reinforced polymer (FRP) bars and discrete, randomly distributed polypropylene fibers. This hybrid system may eliminate problems related to corrosion of steel reinforcement while providing requisite strength, stiffness, and desired ductility, which are shortcomings of the FRP reinforcing system in plain concrete. This paper presents the results of a part of this research program [i.e., the long-term bond behaviors of this FRP/fiber-reinforced concrete (FRC) hybrid system]. Bond durability for the FRP/plain concrete system that served as a reference is also reported. Test results indicated that ultimate and design bond strength experienced noticeable degradation when exposed to combined environmental conditioning, including freeze-thaw cycles, high temperature (60°C), and deicing salt solution. Test results showed that bond durability significantly improved owing to the restriction of the concrete crack by the addition of polypropylene fibers. The larger specimens with thicker concrete cover and relatively smaller direct exposed area to the solution of sodium chloride (NaCl) showed better bond durability. Comparing glass FRP specimens with carbon FRP specimens, it was found that bond degradation was tightly correlated to the degradation of FRP bars.
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Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 16 • Issue 4 • August 2012
Pages: 371 - 380
Copyright
© 2012. American Society of Civil Engineers.
History
Received: Jul 13, 2011
Accepted: Dec 8, 2011
Published online: Dec 10, 2011
Published in print: Aug 1, 2012
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