순환굵은골재 치환율에 따른 콘크리트의 압축파괴 및 음향방출특성

Twelve pullout tests were carried out in order to investigate the bond behaviour between recycled coarse aggregate concrete and reinforcing steel bars. Four recycled coarse aggregate replacement level (i.e., 0%, 30%, 60% and 100%) was considered in this paper. Base on the test results, the influences of both recycled coarse aggregate replacement level on the bond strength between the recycled coarse aggregate concrete and reinforcing steel bars were investigated. It was found that under the equivalent mix proportion(i.e., the mix proportions are the same, except for different recycled coarse aggregate replacement level), the bond strength between the recycled coarse aggregate concrete and the reinforcing steel bars has no obvious relation with the recycled coarse aggregate replacement level. Also, Specimens with recycled coarse concrete showed a higher bond stress than that provided in CEB-FIP Code.