Experimental study on quasi-static mixed mode fracture in self-compacting concrete with longitudinal reinforcement and steel fibers

This study investigates the mixed-mode fracture behavior of self-compacting concrete specimens reinforced with longitudinal steel bars and steel fibers. The experimental program involved three-point bending tests on asymmetrically notched prismatic specimens designed to induce and propagate mixed-mode cracks. The influence of different steel fiber dosages on crack initiation, propagation, and final failure was evaluated. Key findings reveal that the addition of steel fibers significantly enhances energy absorption and ductility under combined mode I and mode II fracture conditions. The results demonstrate the effectiveness of steel fibers in delaying brittle failure and improving the overall structural performance. Novelty lies in the combined use of self-compacting concrete and steel fibers to explore mixed-mode fracture mechanisms in reinforced elements. • Mixed-mode fracture behavior of self-compacting concrete under quasi-static load conditions. • Steel fiber reinforcement significantly enhances ductility and energy absorption. • Experimental study reveals the impact of fiber content on crack propagation patterns. • Innovative methods combine longitudinal steel bars and fibers for improved strength. • Results highlight critical role of steel fibers in mixed-mode fracture resistance.