To investigate the bonding performance between the reinforcement and coarse aggregate UHPC(ultra-high performance concrete), six sets of pulling out specimens were tested. The effect of reinforcement diameter, cover layer thickness, and anchorage length were quantitatively studied, and further analysis based on the classic thick-cylinder theory and Lame Formula were conducted to obtain the influence of cover layer thickness. The formula for estimating the peak bonding stress was obtained through regression analysis, which was validated with the several physical tests. According to the results, the bonds between the reinforcement and coarse aggregate UHPC have similar failure modes with that of RPC(reactive powder concrete), including " wipe failure" and " split failure". The thickness of cover layer in coarse aggregate UHPC is a little larger than that in RPC, while the demand of anchorage length is almost the same. The cover layer thickness and anchorage length have interactive effect on each other, meaning that sufficient anchorage length can reduce the requirement of cover layer thickness. Finally, the suggested anchorage length is presented. © 2019, Editorial Department of Journal of Southwest Jiaotong University. All right reserved.
