## 4 Conclusions and Future Research
All this information could lead to a more in-depth assessment of the mechanical performance of asphalt mixtures with high rates of recycled aggregates, for example, by obtaining reliable correlations between the RCA properties, the stiffness/fatigue resistance of the mixtures, and their permanent deformation resistance. Other relevant properties can also be determined in these mixtures, namely, by assessing low-temperature cracking and friction after polishing, FAP (according to EN 12697\(-\)46:2020 [76] and NP EN 12697-49:2022 [77], respectively). Additionally, another critical assessment that could be included in future research is the validation of the mechanical performance of asphalt mixtures with RCAs (for application in surface layers) after aging (essentially due to the incidence of ultraviolet solar radiation, UV [78]). For this purpose, more comprehensive accelerated ageing simulators, such as TEAGE [79], can be used, in which the samples are subjected to alternating periods of immersion in water/drying and exposure to UV radiation. Conceptualization, F.C.G.M., H.M.R.D.S., J.R.M.O., C.F.N.M., C.D.A.L. and M.M.M.R. ; methodology, F.C.G.M., H.M.R.D.S., J.R.M.O., C.F.N.M., C.D.A.L., J.D.S. and M.M.M.R. ; validation, F.C.G.M., H.M.R.D.S. and J.R.M.O. ; formal analysis, F.C.G.M., H.M.R.D.S., and J.R.M.O. ; investigation, F.C.G.M., H.M.R.D.S., J.R.M.O., C.F.N.M., C.D.A.L., J.D.S. and M.M.M.R. ; writing--original draft preparation, F.C.G.M., H.M.R.D.S., J.R.M.O., C.F.N.M., C.D.A.L., J.D.S. and M.M.M.R. ; writing--review and editing, F.C.G.M., H.M.R.D.S. and J.R.M.O. ; supervision, M.M.M.R., H.M.R.D.S. and J.R.M.O. All authors have read and agreed to the published version of the manuscript. This research was funded by the \"Environment, Climate Change and Low Carbon Economy Programme--Environment Programme\" (EEA financial mechanism 2014-2021) through the Funding Mechanism Commission established by Iceland, Liechtenstein, Norway, and Portugal, under the scope of project \"_CirMat_--CIRcular aggregates for sustainable road and building MATERIALS\" (Project16 Call#2). This study was also supported by Fundacao para a Ciencia e a Tecnologia through the PhD grants number 2021.06428.BD and 2021.08004.BD. This work was also partly financed by FCT/MCTES through national funds (PIDDAC) under the R&D Unit Institute for Sustainability and Innovation in Structural Engineering (ISISE), under reference UIDB/04029/2020, and under the Associate Laboratory Advanced Production and Intelligent Systems ARISE under reference LA/P/0112/2020. **Institutional Review Board Statement:** Not applicable. **Informed Consent Statement:** Not applicable. **Data Availability Statement:** Data are contained within the article. **Acknowledgments:** The authors would like to thank all the _CirMat_ project members who contributed to achieving this study's objectives through motivating discussions during several project meetings. **Conflicts of Interest:** Author [PERSON] is employed by the company Domingos da Silva Teixeira, SA (_dst_, _S.A._). The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.