“…Researchers have studied the incorporation of different types of materials and design methodologies to avoid an excessive increase in the stiffness modulus, which is a characteristic of mixtures with high RAP content that can affect long-term performance, turning them into a brittle material susceptible to the appearance and propagation of cracks. The use of rejuvenating additives (oils and waxes) [24,25], polymer modified binders [26,27] or lower grade PG (stiffness compensation) [10], the use of warm mixtures (reduction of short-term aging of RAP) [28,29] and the use of stabilizing additives (slag, fibers, and minerals) [30][31][32][33][34][35] are some of them. On the one hand, these techniques make it possible to counteract the aging of RAP by controlling its viscoelasticity and, on the other hand, to stabilize the behavior of RAP mixtures against the phenomena of loss of adhesiveness due to moisture conditions, fatigue damage, and permanent deformation, the main causes of deterioration of this type of mixtures [36].…”