Dynamic mechanical behaviour of reactive powder concrete subjected to repeated impact

Reactive powder concrete (RPC) with a compressive strength of 200MPa was prepared by substitution of ultra-fine industrial waste powders for 60% cement by weight. The dynamic mechanical behaviour of RPC with different fiber volume fraction was researched on repeated compressive impact in four kinds of impact modes with the split Hopkinson pressure bar. Standard strength of repeated impact was defined. The effects of impact times, impact modes and fiber volume fraction on the properties of RPC subjected to repeated impact were explored. Results show that the ability of repeated impact resistance of RPC is increases with fiber volume fraction. With the increase of impact times, the damage of material increases and the standard strength decreases. With the change of impact modes, the damage of material on the first impact and the reduction rates of the peak stresses on the second and third impact increase.