Abstract
In order to investigate the bonding performance between reactive powder concrete (RPC) and normal concrete (NC), nine groups of RPC-NC composite specimens were designed for double-sided shear based on the orthogonal test. The test parameters include interface roughness, RPC water binder ratio and steel fibre content. The results show that the roughness is the most important factor to affect the bond shear strength, followed by RPC water binder ratio, and steel fibre content has the least influence. In the range of 2.11mm ~ 6.01mm average sand filling depth, the bonding strength of RPC and NC with the same water binder ratio increases with the increase of interface roughness. The average bonding strength of 0.22 water binder ratio group is the highest, and it is 7.6% and 28.3% higher than that of 0.24 and 0.20 groups, respectively. Based on the test results, the prediction formula of the bond shear strength of RPC-NC considering the interface roughness and the water binder ratio of RPC is established.
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