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Volume 42 Issue 1
Dec.  2024
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WU Fangwen, BIAN Zhengrong, WU Jianhui, et al. Experimental study on the flexural behavior of textile/steel wire strand mesh reinforced ECC-RC composite beam[J]. Acta Materiae Compositae Sinica, 2025, 42(1): 441-452. DOI: 10.13801/j.cnki.fhclxb.20240417.002
Citation: WU Fangwen, BIAN Zhengrong, WU Jianhui, et al. Experimental study on the flexural behavior of textile/steel wire strand mesh reinforced ECC-RC composite beam[J]. Acta Materiae Compositae Sinica, 2025, 42(1): 441-452. DOI: 10.13801/j.cnki.fhclxb.20240417.002
shu

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

  • School of Highway, Chang'an University, Xi'an 710064, China

Funds: National Natural Science Foundation of China (52378121); Natural Science Basic Research Program of Shaanxi (2022JZ-32); Fundamental Research Funds for the Central Universities (300102212212)
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  • Received Date: January 29, 2024
  • Revised Date: March 15, 2024
  • Accepted Date: March 31, 2024
  • Available Online: April 29, 2024
  • Published Date: April 17, 2024
    Abstract

  • In order to explore the flexural performance of reinforced concrete beams strengthened with different types of grid reinforced engineered cementitious composites (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-reinforced concrete (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.

    • Summary

  • Summary

    Objectives 

    Because of its strain hardening characteristics and excellent crack dispersion ability and control force, ECC is widely used in the field of concrete structure reinforcement. This paper studies the influence of CFRP grid, BFRP grid and the high-strength steel wire strand mesh reinforced ECC layer on the flexural performance of reinforced concrete beams, and the high-strength steel wire strand mesh ECC layer with the best reinforcement effect on reinforced concrete.

    Methods 

    In this paper, a new reinforcement method of reinforced concrete beam is adopted. The grid reinforced ECC layer is used to replace the concrete in the tensile zone to form ECC-RC composite beam. this paper mainly adopt the experimental comparison method and A total of two comparative beams: a reinforced concrete beam and an ECC-RC composite beam without grid reinforced. And three different types of grid reinforced ECC-RC composite beams are set up. Combined with four-point bending loading test and digital image technology, the data of displacement at both ends of the bearing, mid-span deflection, concrete / steel strain and load grade of the test beam were collected, and the relative data were analyzed by Origin software. According to the calculation formula of flexural capacity of reinforced concrete normal section, the calculation formula of flexural capacity of grid reinforced ECC-RC composite beam is derived on the basis of considering the utilization rate of textile.

    Results 

    According to the four-point bending loading test, the failure process of all grid-reinforced ECC-RC test beams is that the tensile steel bars yield first. As the load level increases, the concrete in the compression zone is crushed, and then the test beam is destroyed. The textile reinforced ECC-RC beam has the phenomenon of fracture caused by the uneven stress of the fiber grid during the loading process. According to the analysis of concrete strain at different heights of concrete mid-span section, it can be seen that the longitudinal concrete strain parallel to the neutral axis of the beam along the section height is roughly linearly distributed with the distance from the neutral axis. Compared with the non-grid reinforced ECC-RC composite beam, the number of cracks in CFRP grid reinforced ECC-RC beam, BFRP grid reinforced ECC-RC beam and the high-strength steel wire strand mesh reinforced ECC-RC composite beam increased by 25 %, 70 % and 40 %, respectively, while the maximum crack width of ECC-RC decreased with the increase of grid. Form the ultimate load analysis, compared with the non-grid reinforced ECC-RC composite beam, the CFRP grid reinforced ECC-RC beam, the BFRP grid reinforced ECC-RC beam, and the high-strength steel wire strand mesh reinforced ECC-RC composite beam are increased by 11.02 %, 9.45 %, and 33.84 %, respectively. From the mid-span deflection analysis corresponding to the ultimate load, the CFRP grid reinforced ECC-RC beam, the BFRP grid reinforced ECC-RC beam and he high-strength steel wire strand mesh reinforced ECC-RC composite beam are increased by 5.83 %, 15.12 % and 23.73 % respectively compared with the non-grid reinforced ECC-RC composite beam. The ductility of the test beams was evaluated by the displacement ductility index. Compared with the ECC-RC composite beams without mesh reinforcement, the ductility of CFRP mesh reinforced ECC-RC beams, BFRP mesh reinforced ECC-RC beams and high strength steel strand mesh reinforced ECC-RC composite beams increased by 2 %, 18 % and 21 %, respectively. The stiffness of each test beam is analyzed by using the cross-section stiffness defined by Huanghua, that is, the ratio of mid-span bending moment to deflection. In the whole process of loading, the stiffness of CFRP grid reinforced ECC-RC beam, BFRP grid reinforced ECC-RC beam and the high-strength steel wire strand mesh reinforced ECC-RC composite beam is larger than that of the contrast beam. In addition, based on the experimental results and theoretical analysis, the formula for calculating the flexural capacity of the normal section of the grid-reinforced ECC-RC composite beam is established.Conclusions: The failure mode of the grid-reinforced ECC-RC composite beam is ductile failure, and the plane section assumption is satisfied during the whole loading process. The bonding performance between ECC and fiber mesh or the high-strength steel wire strand mesh, ECC layer and concrete is good, and the two can coordinate deformation. The grid-reinforced ECC layer significantly improves the crack dispersion ability and crack resistance of the ECC-RC composite beam. The ECC layer reinforced by CFRP / BFRP / the high-strength steel wire strand mesh has different degrees of improvement on the flexural capacity, deformation capacity, ductility and stiffness of ECC-RC composite beams. The effect of flexural capacity and stiffness improvement : the high-strength steel wire strand mesh > CFRP grid > BFRP grid ; the improvement effect on deformation capacity and ductility : the high-strength steel wire strand mesh > BFRP grid > CFRP grid. On the basis of considering the utilization rate of fiber grid, the calculation formula of flexural bearing capacity of grid reinforced ECC-RC composite beam is established, and it is in good agreement with the experimental results.

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