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http://dx.doi.org/10.5762/KAIS.2018.19.12.686

Development of Filler Type Mechanical Splice for High Strength Re-bar  

Lee, Seongsoo (Department of Architecture Ocean Construction Convergence Engineering, Kunsan National University)
Chun, Homin (Department of Architecture, Chodang University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.12, 2018 , pp. 686-693 More about this Journal
Abstract
Various types of re-bar splicing methods have been developed and applied to reinforced concrete (RC) structures in the field. According to previous studies, the coupler splice is relatively superior to the lap splice in terms of cost efficiency when the diameter or strength of the re-bar is larger or higher. This study was performed to develop a filler type mechanical splice for a high-strength re-bar (SD600) in reinforced concrete structures. The deformed re-bars were inserted into a circular steel tube coupler and high-strength epoxy filler was then injected into the coupler. The splice system was completed by hardened filler in a coupler. The epoxy filler was used as the manufactured production epoxy to conduct experiments of filler type mechanical splice specimens, and to observe the failure loads and failure aspects of the specimens. For this goal, the experiment of one-way tensile test was conducted for the epoxy filler type mechanical splices specimens according to the compressive strength of epoxy, length of coupler, and diameter of re-bar. The shape of failure of the re-bar coupler splice showed that the re-bars were pulled between the lugs of the re-bars as a result of the shear fracture of the hardened epoxy. The actual failure load of the experiment specimen was approximately 2 times higher than the expected failure load of the epoxy filler, which greatly improves the failure load of the hardening epoxy filler due to the restraint of the steel coupler.
Keywords
Filler; Coupler; Epoxy; Mechanical splice; High-strength re-bar;
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