Steel recycling saves energy and time and is more environmentally friendly. It rids the environment from huge amounts of scrap cars and huge structures, as well as reduces mining operations that destroy the natural environment. In this investigation, the steel scrap effect on the mechanical properties of concrete was investigated, in addition to investigate the variation of mechanical properties with increasing the concrete age. Three concrete mixes were studied: one without steel waste as a control, one with 1 % steel waste by volume of concrete, and one with 1.5 % steel waste by volume of concrete. The results show that adding waste steel to the concrete improved compressive strength as well as tensile strength. where, the mixing which contains 1% of steel waste, has an increase in strength that reaches up to 12% and 23% at 28 days for compressive strength and tensile strength sequentially as compared to the reference mix. Furthermore, the results show that there is a significant increase in splitting tensile strength that reaches 29% at day 28 for a mix of 1.5% steel waste as compared to the reference concrete mix. The best improvement in compressive strength over time was obtained when using 1% steel waste. While the best improvement in tensile strength over time was obtained when using 1.5% steel waste. In both cases, the amount of improvement is better than the models without steel waste, which gives us confidence in giving recommendations for conducting more in-depth studies to achieve maximum advantage.