On anti-penetration and anti-perforation characteristics of high-strength steel fiber-reinforced concrete

Ballistic experiments with projectile velocities of 297~848 m/s were performed by using a 12.7 mm ballistic gun to investigate the anti-penetration and anti-perforation performances of the plain concrete and steel fiber-reinforced concrete (SFRC) with different steel fiber volume fractions and types. The steel fibers include the flat-straight and hooked-end ones, and their range of volume fraction is from 0.01 to 0.05. The impact velocity, maximal penetration depth, crater diameter, target failure model were obtained. The dynamic failure processes of all targets were observed by means of a high-speed camera. Experimental results show that the penetration depth of the projectile in SFRC in which the hooked-end steel fiber volume fraction is 0.05 decreases by 52% compared with that in the plain concrete with the same strength grade, and the quantity and scattering angle of the target debris decrease largely. Therefore SFRC with high volume fraction of deformed steel fibers is effective on anti-penetration and anti-perforation.