Abstract
Ultra-high performance fiber reinforced concrete (UHPFRC) has high compressive strength of about 150-200 MPa, but does not have sufficient ductility requires for optimum performance in protective structures, which are usually subjected to large inelastic deformation unless steel fibers are introduced to the mix. However, it has been shown that incorporating steel fibers complicates the mixing process and disrupts UHPFRC production rate. Nano-modified polymer concrete (NMPC) has a superior ductility, about 3% failure strain as against 0.3% failure strain of normal concrete, appreciable tensile strength, and an outstanding bond strength. This study focuses on the performance of NMPC walls under blast loading using a nonlinear finite element program, LS-DYNA, which has been used in different blast loading simulations, by choosing sufficient time steps, material constitutive models, and numerical integration technique. Hybrid composite concrete panels produced by interlocking elements made of UHPFRC and NMPC are studied with respect the charge weights, standoff distances, composite action of UHPFRC and NMPC configurations, and stress distribution across the wall.