Synergistic Effect of Chopped Fibers and Basalt Fiber Textile on Concrete Flexural Behavior

To reveal the synergistic effect of chopped fibers and basalt fiber textile in different failure stages of concrete, this study investigated the hybrid effects of chopped basalt fibers, polypropylene fibers, and end-hooked steel fibers and basalt fiber textile on concrete at the stages of initial cracking, crack propagation, and post-peak softening. The four-point bending test results show that the basalt fiber textile has limited effect on the initial crack strength but can increase the ultimate load by 19.98% and the ultimate deflection by 175.94% compared with plain concrete by inhibiting macroscopic crack propagation. There is a complex synergistic effect between chopped fibers and fiber textile. Chopped fibers can compensate for the insufficient reinforcement of the textile in the initial cracking stage, while the textile dominates the toughness maintenance in the later stage of crack development. The hybrid system of chopped fibers and textile can enhance the flexural bearing capacity of textile-reinforced concrete. The mixture of polypropylene fibers or basalt fibers with fiber textile exhibits a post-peak embrittlement trend, while the ternary system of basalt fibers, end-hooked steel fibers, and fiber textile can achieve synergistic optimization of strength and toughness. Its peak load, bending toughness index of I20, and peak load deflection increased by 44.30%, 50.71%, and 13.76%, respectively, compared with the control group. This study provides theoretical support for the material design of high-performance basalt fiber textile-reinforced concrete and its application in thin-walled, prefabricated, and seismic strengthening engineering.