Impact resistant performance of polypropylene short fiber reinforced concrete subjected to high velocity impact

Local damage of concrete structures, i.e. spalling, scabbing, perforation, would occur when concrete structures are impacted by high velocity projectiles. Scabbing and perforation must not occur in order to protect people and other properties inside of the structure from fragments scattering from the impacted structure. To reduce the local damage such as scabbing and perforation, it would be an effective measure to reinforce concrete with short fibers. Therefore, an experimental study on short fiber reinforced concrete plates impacted by a high velocity projectile was carried out, where the length, diameter and mix proportion of polypropylene short fiber were taken as main experimental parameters. As the result of study, it is confirmed that the local damage is effectively reduced by reinforcing concrete with polypropylene short fibers, and that the number of short fibers in a unit volume of concrete and the compressive toughness of concrete could be effective parameters on the reduction of local damage.