Microwave heating treatments for assisted self-healing of asphalt mixtures have been investigated over the last years. However, the only heating treatment does not permit to recover the entire original strength of the asphalt mixtures. The experimental results of this investigation show that the combination of heating and re-compacting of the pavement (thermomechanical treatment) can overcome these limitations, restoring the original tensile strength of the mixtures. During the investigation, an innovative type of mold for the gyratory compactor has been developed. The peculiarity of the mold is that it can be longitudinally opened and closed through the use of hex screw heads. Thanks to this two-parts mold, the previously broken specimen can be easily reintroduced into the mold to be subjected to new cycles of re-compaction with the kneading effect of the gyratory compactor. The experiment done in this investigation was carried out on asphalt mortars with steel fibers or electric arc furnace slag. The results showed that the additives and the re-compaction technique reduce drastically the heating energy necessary to assist self-healing of the mortars. This thermomechanical treatment could be implemented in the field by heating the deteriorated pavement with a microwave generator, and then re-compacting the pavement with a rolling compactor, which can promote the healing process thanks to its kneading action on the heated pavement.