Projectile penetration into fibre reinforced concrete.

A wide range of fibre reinforced concretes, potentially capable of sprayed application, and which could be used for protecting buildings, has been tested. Specimens 450mm square have been impacted by 7.62mm A. P. projectiles, and the damage assessed in terms of penetration path lengths within the specimens and the volume of the impact face spall crater. It has been found that inclusion of fibres does not increase the penetration resistance, but a small proportion of fibres significantly reduces the impact face spalling. The mechanisms of penetration and spalling have been examined using high speed photographic techniques and instrumented specimens.