Impact Resistance of Two-Way RC Slabs considering Steel Fiber Volume Fraction and Compressive Strength

To investigate impact resistance of two way RC slabs, slabs (1,600 mm×1,600 mm×105 mm) were fabricated and tested using drop-weight impact testing machine. Two volume fractions (0, 2 vol%) and concrete compressive strengths (25, 45, 60, 100, 140, 180 MPa) were considered as the variables. To evaluate the impact resistance of the slabs, failure modes, impact and reaction force, and deflection were measured and the energy dissipating capacity was derived from the force-deflection relationships. As a result, it was found that addition of steel fibers enhanced impact resistance of two way RC slabs in load carrying capacity, energy dissipating capacity, and displacement. Furthermore, steel fiber reinforced concrete specimens of 140, and 180 MPa showed significantly larger energy dissipating capacity in comparison with the others.