Experimental study and numerical simulation of the interfacial bonding performance of ordinary concrete reinforced with reactive powder concrete

Abstract

To solve the problems of poor durability and low bearing capacity of existing concrete reinforcement technology, a bisurface shear test between reactive powder concrete (RPC) and ordinary concrete (OC) was conducted based on the technique for strengthening concrete structures with reactive powder concrete and steel mesh (RPCSM). The shear strength, failure mode and load-slip curves of each specimen were analysed. The influence of roughness, rebar planting rate, and steel mesh specifications on the shear performance of the interface of the RPCSM-OC was discussed. The results show that the RPCSM-OC interface has better bonding performance, and that the increase in shear strength and ductility is significant after reinforcement. Within a certain range, the shear strength of the bonded interface increases as the roughness increases; the shear strength and ductility increase with increasing the rebar planting rate; and the steel mesh specifications have a significant influence on the interface ductility. Second, a three-dimensional finite element model (FEM) of 27 specimens was established using ABAQUS software, and a simple FEM considering bonding effects was proposed. From the damage modes of the specimens and the stress distribution of RPC, OC and steel bars, the simulation results are shown to be in good agreement with the experimental results. On this basis, a calculation model of the shear strength of the RPCSM-OC bonded interface was established, and a formula for comprehensively calculating the shear strength of the RPCSM-OC interface was proposed. The calculation results were in good agreement with the test results, and the experimental shear strength values were within 10% error of the simulated values, which provides a theoretical basis for the engineering application of RPCSM-OC reinforcement technology.