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http://dx.doi.org/10.14190/JRCR.2017.5.3.298

Bond Behaviors of Epoxy Coated Reinforcements Using Direct Pull-out Test  

Kim, Jee-Sang (Department of Civil Engineering, Seokyeong University)
Lee, Sang-Hyun (Department of Civil Engineering, Seokyeong University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.5, no.3, 2017 , pp. 298-304 More about this Journal
Abstract
The corrosion of reinforcements embedded in concrete causes some durability problems in reinforced and prestressed concrete structures. The epoxy coated reinforcements are one of the effective and reliable methods to prevent corrosion of reinforcements. However, it has been known that the epoxy coating reduces the bond capacity of reinforcement to concrete. This paper investigates the bond behaviors of epoxy coated reinforcements experimentally using direct pull-out test. Bond behaviors of epoxy coated bars for various reinforcement diameters of 10, 19 and 29mm and thicknesses of cover concrete of 1, 2, 3, and $4.5c/d_b$ (ratio of cover to bar diameter) are examined. Total 66 specimens were manufactured and tested according to the RILEM standard method. As the diameters of the epoxy coated reinforcements increase, the difference of bond strength between epoxy coated reinforcements and uncoated bars also increases. Epoxy coated bars showed more than 85% bond performance compared to those of uncoated bars. A new formular for estimating basic development length of epoxy coated reinforcement based on equilibrium equation is proposed using this experimental result.
Keywords
Epoxy coated reinforcements; Direct pull-out test; Bond Stresses; Development length;
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