Shear response evaluation of sustainable self-compacting concrete made up of recycled steel fibers of waste tyres

Use of rapidly increasing waste tyres can fetch the demand of green construction as well as prevent priceless land from becoming land dumps. The idea of using heavy traffic vehicle end-of-life tyres (HTV-ELT) steel fibers is implemented to investigate the shear crack propagation and corresponding shear strength evolution of steel fiber-reinforced green self-compacting concrete (SFRGSCC). Three different average aspect ratios (25,35,45) mm were employed in two dosages (0.125% and 0.25% of total volume of matrix) in this work. It was determined that with the addition of end-of-life tyres steel fibers the rheological properties of SFRGSCC were decreased up to some extent but lies within the limiting value of the European Federation of National Associations Representing for Concrete (EFNARC). The addition of end-of-life tyres steel fibers showed a positive impact on postcracking behavior in shear. Interestingly, the experimental results indicated that the addition of end-of-life tyres steel fibers increased the ultimate shear strength of SFRGSCC beams as well as the compressive strength and splitting tensile strength of SFRGSCC. Whereas the crack width opening was significantly decreased besides controlling the deflection.