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Steel is essential to our contemporary way of life and economic development, and its inherent advantages offer it a versatile solution in an increasing variety of applications. About 70% of global steel is produced from iron ore, while steel scraps account for 30%. Around one tonne of steel produces about 400 kg of granulated blast furnace slag (GBFS) and basic oxygen furnace slag (BOFS), commonly known as steel furnace slag (SFS) or steel slag. While several re-purpose applications of GBFS is available, utilisation of BOFS is minimal. Recently, steel slag coarse aggregates (> 6 mm) have been used in the asphalt mix for the surface course in pavement constructions. However, the applications of finer slag particles (< 6 mm)) in construction applications are limited because of the unhydrated lime and magnesium oxide, causing a volumetric expansion of up to 10%. Therefore, this research investigates the potential of a composite mixture using GBFS in controlling the swelling of BOFS. ....