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One of the most important requirements for reinforced concrete constructions is the bond behavior between concrete and reinforcement. For practical application, it is very important to study bond behavior of reinforcing bars in recycled aggregate concrete (RAC). In this study, bond tests are conducted on 36 pullout specimens to study the influence of recycled coarse aggregate replacement level (i.e:, 0%, 30%, 60% and 100%) and compressive strength of concrete (i.e.. 21㎫, 27㎫, and 40㎫). Each specimen was in the form of a cube, with edges of 150㎜ in length and for the pull-out tests, a deformed bar, 16㎜ in diameter, was embedded in the center of each specimen. Base on the test results, the influences of both recycled coarse aggregate replacement level and the bond strength were investigated. The specimens of 21㎫ and 27㎫ failed due to pull-out failure mode, but 40㎫ specimens have splitting failure mode. It was found that under the equivalent concrete strength, the bond stress between the recycled coarse aggregate concrete and the deformed bars has no obvious relation with the recycled coarse aggregate replacement level. Also, specimens with recycled coarse aggregate concrete showed a higher bond stress than that provided in CEB-FIP Code.

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2. 실험
3. 실험결과 및 분석
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UCI(KEPA) : I410-ECN-0101-2009-540-014969862