Experimental characterization of concrete beams elements reinforced by long fiber chips

摘要

This work deals with the experimental study of the mechanical behavior by three-point bending tests and shear (fracture shear) of concrete beam elements reinforced by long fibers. These fibers come from machined steel parts waste. Bending and shear tests are conducted on prismatic specimens 10x20x120 cm(3). Compressive strength tests are carried out on cylinders of 16cm diameter and 32cm height. The fibers are characterized in terms of mechanical strength and tear strength. The composition of the concrete is determined by the experimental method called Dreux-Gorisse.' Two different fiber contents were used for this study (W=0.6, 0.8) and a control concrete BT (W=0) of the same composition as the matrix is prepared as a reference. The comparison of the different results obtained shows that long fibers provide a significant ductility to the material after concrete cracking. Also, the used fibers limit diagonal shear cracks and improve the strength and rigidity in bending and shear.