Viability of Using High Amounts of Steel Slag Aggregates to Improve the Circularity and Performance of Asphalt Mixtures

Steel slag is a byproduct generated as waste during the steelmaking process and can be considered cost-effective environmentally acceptable alternative to replace natural aggregates. Using steel aggregates (SSA) produce asphalt mixtures promotes sustainability circular economy principles by using an industrial raw material. Thus, this work mainly aims design more sustainable with high amounts of SSA that fit expectations. This developed two for surface (AC 14 surf) binder/base 20 bin/base) courses. Initially, excellent wearing polishing resistance their good affinity bitumen demonstrated potential used in mixtures. Then, when analyzing influence different incorporation rates (50% percentage close 100%) both mixtures, it was concluded use should limited 75% avoid excessive air void contents durability problems. The importance considering particle densities highlighted mix defining relationship between effective equivalent binder content. Finally, mechanical performance AC compared identical conventional produced granite results obtained showed have some workability problems due rough porous SSA. However, they present water sensitivity permanent deformation resistance, surpassing