Flexural behavior of self-compacting concrete reinforced with different types of steel fibers

The aim of the present work is to investigate the flexural behavior of self-compacting concrete reinforced with straight and hooked end steel fibers at levels of 0.5%, 1.0% and 1.5% and compare it to normally vibrated concrete (NVC). The laboratory tests were determined according to RILEM TC 162-TDF recommendation. The flexural behavior of SCC appeared to be comparable to NCV, where the increase of fibers volume ratio cause the increase in prepeak and post-peak parameters of SCC. Nevertheless, the type of steel fibers influences much this dependency. Based on the performed analysis, the flexural tensile strength of SFR-SCC can be described with the formulas used for SFRC. The equation proposed to predict the deflection-CMOD relationship of SCC fits into the coefficient of variation of the formula for NVC. However, the SCC achieves the maximum crack mouth displacement for lower deflections than NVC. The article contains also the analysis of the fracture energy of SCC with a formula to describe it.