Ductility and strength of hybrid fiber reinforced self-consolidating concrete beam with low reinforcement ratios

Based on the workability test of fiber reinforced self-consolidating concrete, this paper presents experimental study on flexural behavior of a series of fiber reinforced self-consolidating concrete beam with low reinforcement ratios. The major parameters include fiber types, fiber dosages and reinforcement ratios. The load-deflection curves of hybrid fiber reinforced RC beams and flexural ductility in comparison with steel fiber reinforced RC beams are analyzed. The investigation shows that the yield load and ultimate load of hybrid reinforced RC beam increase clearly compared to RC beam with minimum longitudinal reinforcement ratio or steel fiber reinforced RC beam, indicating positive hybrid effect. The ultimate load of 40 + 4 kg/m3 hybrid fiber reinforced RC beam with minimum longitudinal reinforcement ratio is similar to that of RC beam with 1.5 times of minimum longitudinal reinforcement ratio. The flexural ductility of RC beam with minimum longitudinal reinforcement ratio is decreased due to fiber addition.