 This research evaluated the effectiveness of microwave heating for improving the self-healing properties of asphalt mixtures. It found that mixtures with steel slag aggregates and steel wool fibers had the highest heating capacity and best self-healing performance. These mixtures also showed the greatest strength recovery after a total fracture and fatigue life recovery of up to 150%. This suggests that steel slag aggregates are key to achieving optimal self-healing capabilities in asphalt mixtures. This article was authored by Carlos Die Lerero, Hugo M.R.D. Silva, Joel R.M. Oliveira, and others.