Experimental study on the flexural behavior of textile/steel wire strand mesh reinforced ECC-RC composite beam

In order to explore the flexural performance of reinforced concrete beams strengthened with different types of grid reinforced ECC layer, the effects of textile and steel wire strand mesh on the bearing capacity, crack control ability, ductility and stiffness of composite beams were analyzed by four-point bending test. The experimental results show that compared with ECC-RC beam, the crack width of ECC-RC composite beams reinforced by textile or steel wire strand mesh decreases, and the number of cracks increases by 25%-70%. The textile-reinforced ECC layer can improve the crack control ability of composite beams and inhibit crack propagation. The textile or steel wire strand mesh reinforced ECC layer can improve the cracking load, yield load, ultimate load, ductility and stiffness of the composite beam. During the bending loading, the section of textile or steel wire strand mesh rein-forced ECC-RC composite beam meets the plane section assumption, and the textile-reinforced ECC layer is well bonded to concrete. Based on theoretical analysis and the experimental results and considering the utilization rate of textile, the calculation formula of the flexural capacity of textile or steel wire strand mesh reinforced ECC-RC composite beams is established. The calculation results are in good agreement with the experimental results. The high-strength-reinforced ECC layer has the best reinforcement effect on the flexural performance of ECC-RC composite beams, which can significantly improve the bearing capacity, ductility and crack resistance of composite beams.