Fiber geometrical parameters of fiber-reinforced high strength concrete and their influence on the residual post-peak flexural tensile strength

This paper studies the relation between fiber density and orientation and behavior under flexural tensile stress, through the use of CT-Scan technology. To do so, a high-strength steel-fiber reinforced concrete wall was constructed and 8 100 × 100 × 350 mm prismatic specimens were extracted from different sections of the wall, with the intention of revealing different fiber density and orientation values. First, the specimens were scanned using a CT-Scan, to obtain the real fiber density and orientation values. Subsequently, they were tested in a three-point-bending test, to obtain the curves tension -CMOD, and LOP values and residual strength under tension. Finally, empirical relations are shown between those values and fiber density and orientation.