Study on the Characteristics and Stability of Coarse Steel Slag Aggregate

From the view of feasibility study on steel slag as coarse aggregate of concrete,morphology,chemical composition and mineral composition and other characteristics of steel slag had been investigated through the XRF,XRD and SEM microscopic observation. Different coarse aggregates had been prepared with addition of 100%,75%,50%,25%,and 0% steel slag.Based on the determination method for steel slag stability,autoclaved powder ratio of resulted coarse aggregated had been measured.The corresponding concrete test block made of the different aggregate had been test in terms of its compressive strength at different ages and its stability after 28-day aging.The results show that the steel slag can be used as the coarse aggregate of concrete.With the increase of the proportion of steel slag,the stability of the concrete is reduced,the optimum content is 50%,and the corresponding powdering rate is about 4.7%.