Process Improvement on the Gradation Uniformity of Steel Slag Asphalt Concrete Aggregate

Abstract

A great amount of steel slag aggregate is used to prepare cement concrete and asphalt concrete in road construction However, the steel slag aggregate processed by the traditional aggregate production line is not uniform, which is not conducive to the full-size utilization of steel slag. Therefore, a new method of steel slag aggregate processing was proposed in this study in order to obtain the high quality steel slag aggregate with different specifications Experimental results indicated that the specifications stability of the steel slag was improved significantly when the steel slag was crushed by the combination equipments of jaw crusher and cone crusher. The screening efficiency and stability of the aggregate can be improved as the multi-level screening equipments were used into the production line. The wet rolling screen was also developed to remove the dust on the surface of aggregates. The specifications stability and pavement performance indexes of the steel slag aggregate produced by the new production line have been improved significantly compared to the steel slag aggregate produced by the traditional production line.