Use of ladle furnace slag as filler in hot asphalt mixtures

Worldwide, recycling of ladle furnace slag (LFS), one of the waste produced by ironmaking and steelmaking industries, actually represents a big challenge which involves different field of material and construction industry. This paper deals with the reuse of LFS as filler in hot asphalt mixtures. In particular, the physical and chemical properties of LFS were evaluated and a procedure to treat LFS and make it suitable for the application in asphalt concrete (AC) was defined. Finally, the volumetric and mechanical properties of the AC containing LFS were determined. Experimental results showed that the hydrated LFS allows achieving an excellent performance of the AC (in terms of volumetric properties, stiffness, indirect tensile strength and resistance to repeated loads) with respect to the reference mixture with ordinary filler.