The main purpose of this study is to analyse the projectile impact resistance on slabs constructed of ultra-high-performance fibre-reinforced concrete (UHPFRC). The fibre volume fraction of the UHPFRC was set as the main test variable in the framework of this study. The fibre volume fraction was ranging from 0.125% to 2% and accordingly the compressive strength of the UHPFRC was ranging from 118 MPa to 144 MPa. The primary importance was given to the shape of the crater that was produced on the UHPFRC slabs as a result of the projectile impact. The resistance of the slab was therefore evaluated on the basis of the crater depth, crater area and crater volume at the front and rear side of the slab. The resistance to impact loading was tested on rectangular slabs with the measurements of 300 mm × 400 mm × 50 mm (length × width × thickness). It was verified experimentally that fibres are important inhibitor of the damage when dealing with projectile impact. The damage of the slab was reduced significantly when the fibre volume fraction was increased. Also it was shown that the best performance was achieved with the highest fibre volume fraction. It is very important to note that using 2% of steel fibres in the thin UHPFRC targets resulted in no scabbing from the back face of the slab with only a front crater forming. This is very important for facade panels and walls that are used for the purpose of protecting people where no perforation and scabbing of the concrete are allowed to occur.
Sovják, R., Shanbhag, D., Konrád, P., & Zatloukal, J. (2017). Response of Thin UHPFRC Targets with Various Fibre Volume Fractions to Deformable Projectile Impact. In Procedia Engineering (Vol. 193, pp. 3–10). Elsevier Ltd. https://doi.org/10.1016/j.proeng.2017.06.179