The rehabilitation process of asphalt pavement using the milling and filling technique can cause several environmental problems due to either the disposal of milled asphalt mix or the exploitation of new deposits of natural resources. One alternative to reduce carbon emissions in road construction is the reuse this milled material in the construction of new pavement layers. This paper investigates the influence of asphalt content of reclaimed asphalt pavement (RAP) on the physical and mechanical characteristics of the tested mix. Several series of specimens were made from three granular mixes, series 1: specimens made from unbound granular materials (UGM); series 2: specimens based on cement-bound granular materials (CBGM);and series 3: specimens made with a mix of UGM and different proportions (10%, 20%, 30%) of RAP. Physical and mechanical characterization tests of the prepared samples were carried out on all samples at 28 days of curing. The results show that mechanical strengths decrease with an increase in the RAP aggregate content. The modulus of the RAP-based specimens is between the modulus of UGM samples and that of CBGM. The best physical and mechanical characteristics of the recycled aggregate mix are obtained for a proportion of 10% RAP in the mix. Furthermore, an assessment of the carbon emission mitigation potential due to the replacement of new aggregates with RAP, using a life cycle analysis (LCA), shows a significant reduction in carbon emissions from 10% RAP in the granular mix. This work aims to advance policy discussions on integrating circular economy principles into infrastructure standards, with a focus on emissions reduction as a key indicator of sustainable road preservation.