Application of Steel Slag as Aggregate in the Road Construction Industry

Due to the growing technology of various types of vehicles and their increasing application in the transportation network, the development of road quantity and quality is of particular importance. One way to improve and increase the strength of pavements is to use high-quality materials such as steel slag, which will increase the bearing capacity of the pavements and their life span. Steel slags are by-products of the steel factory, which are often stored as deposits and massive masses around these factories. Over the years, extensive research has been conducted around the world for the use of this substance and several fields have been proposed for this purpose. One of these fields which use the steel slags in large amounts, is as the aggregate in the production of asphalt. This is because it has good physical and frictional properties as well as good durability in resisting the slippage of asphalt pavement and preventing the formation of some deterioration, such as rutting, stripping and polishing of asphalt aggregates. In the present study, in addition to studying the mechanical, physical and chemical properties of steel slag as an aggregate alternative in asphalt pavements, the most recent studies have been mentioned and the use of steel slag in road construction including base and sub-base, and asphalt mixes have been investigated.