The effect of treated recycled steel fibers and slag on the properties of recycled self-compacting concrete

Construction industry consumes a large amount of natural resources and energy and produces a large quantity of waste. One of the solutions to reduce its negative effects is recycling wastes to produce environment-friendly materials. This paper presents an experimental investigation on the effect of treated recycled waste tires steel fibers on fresh and mechanical properties of self-compacting concrete made with recycled aggregates and granulated glass blast furnace slag as a substitution to cement by weight. The results showed that the addition of either recycled aggregates or recycled steel fibers reduces the rheological properties by decreasing the slump flow and increasing the V-funnel time. The reduction in rheological properties could be partially mitigated by the substitution of cement by 15 and 25% of GGBFS. The TRSF enhances the compressive and flexural strengths and the elastic modulus and reduces the total shrinkage.