Impact behavior of basalt fiber reinforced concrete

The impacting behavior and damage evolution of basalt fiber reinforced concrete (BFRC) with different fiber mass fraction ranging from 0%~0.60% were tested using three-point bending impact equipment and ultrasonic testing technology. The continued damage detection based on ultrasonic testing was used to reveal the damage evolution process, and the stereomicroscope was applied to observe the surface cracks. The results show that the basalt fiber has little effect on the compressive strength of BFRC, but it can significantly improve the impact toughness of BFRC. The flexural toughness of BFRC with basalt fiber of 0.36%  is 2.2 times higher than that of plain concrete. The results also indicate that each specimen with various mass fraction reflects the brittle fracture behavior, but the energy absorption capacity of concrete can be effectively enhanced by basalt fibers. Contrasted with the controlled concrete, the damage variable of BFRC near destruction increases by 40%～83%. BFRC specimens show multi-cracking characteristics in the failure process, and the vice crack near the main crack is clearly observed after the final destruction.