•Post-blast residual static capacity determined on RC slabs.•Evaluation of retrofit systems on strength, stiffness and damage capacity.•All applied retrofit systems provided some level of blast mitigation.•Retrofitted RC slabs show an increase in residual ultimate load capacity.•Two layers of epoxy resin-impregnated glass mat had the highest contribution. Laboratory static bending tests were carried out to determine post-blast residual load-bearing capacities of retrofitted and un-retrofitted RC slabs. Three different retrofit systems were previously devised to strengthen RC slabs on potential blast-induced damage. The retrofit systems consisted of impregnating epoxy resin with (1) one layer of glass woven fabric and (2) one and (3) two layers of chopped strand glass mat. The contribution to strength, stiffness, energy absorption and damage reduction of devised retrofit systems was evaluated during testing by measured deformations, displacements, and force capacities. The presented results indicate that all applied retrofit systems provided some blast mitigation level by enhancing RC slabs' residual strength and stiffness capacity. However, the retrofit system consisted of two layers of chopped-strand glass mat made the highest contribution to strength preservation.