Investigating the mechanical properties of self-compacting lightweight concrete containing copper slag

In this study, the mechanical properties of self-compacting lightweight green concrete were investigated by replacing copper slag as part of cement. Due to the positive effect of microsilica in this concrete, in order to reduce the grade of cement in self-compacting lightweight green concrete, a basic design without copper and microsilica slag and 7 mixed designs with 0, 5, 10, 15, 20, 25 and 30% copper slag It was provided with 10% microsilica. In order to study the properties of fresh concrete, experiments were performed on slump flow, T50, V funnel and J-ring. Also, compressive, tensile and bending strength tests were performed on hardened concrete at different ages of 7, 28 and 90 days. . Finally, microsilica has been shown to reduce concrete performance and improve compressive, tensile and flexural strengths. Copper slag also increases the performance of concrete and improves its self-compacting properties, but with increasing copper slag, the specific gravity of concrete increases. Also, the optimal percentage of copper slag replacement was 15%. The optimal mix design, with its self-compacting and lightweight properties, weighed 1871 kg / m3. Also, the 28-day compressive, tensile and flexural strengths of this mix increased by about 17%, 18% and 11% compared to the control mix.