Review on Effect of Steel Slag and Fly Ash in Road Construction

Recycling and environmental sustainability goals can be pursued through the reuse of waste generated from different industries such as plastic, glass, iron, etc. in road pavements. The handling of industrial wastes such as fly ash, glass powder, and steel slag has grown to be a major issue in developing nations. The disposal issue will be resolved if fly ash, glass powder, and steel slag can be used for road construction. The current study examines the impact of coarse steel slag aggregate (instead of coarse natural stone aggregate) and fly ash (FA) as fillers on the performance of asphalt mixes for road construction. The reuse of metallurgical slags in road pavement is an important concern. Mostly the by-products produced during the separation of molten steel from impurities in steel-making furnaces include steel slag is generally used in our study on road pavements. Its manufacturing procedures, and chemical, morphological, and physical features have an impact on its contribution to asphalt mixture when slag partially or fully replaces virgin aggregate. This study reviews physical, chemical, and mechanical properties and developments in several areas related to using steel slag aggregate and fly ash in hot-mix asphalt. Road performance can be considerably impacted by the characteristics of steel slag. By-product of burning pulverized coal i.e., fly ash. It can be utilized as a mineral filler in hot mix asphalt (HMA) paving applications at a reasonable cost. Based on the Marshall parameter specific percentage of filler i.e., Fly Ash used in HMA is fixed. Compared to other filler materials, the FA performs better. Additionally, a cost study shows that asphalt mixes containing FA and steel slag aggregate have lower construction and life cycle costs than the control mix. FA and steel slag aggregate both can be utilized as substitute components in asphalt mixes for the construction of roads.