This study examined the properties of asphalt mixtures incorporating high proportions of recycled asphalt pavement (RAP). Bitumen was modified with a rejuvenator at 2%, 4%, and 6% proportions, in combination with 35%, 40%, and 45% RAP. Results showed increased strength and rutting resistance with higher RAP ratios. All RAP-rejuvenator combinations exhibited higher indirect tensile strength compared to the reference mixture. Asphalt mixtures with 45% RAP and 2% rejuvenator-modified bitumen displayed the best rutting resistance. Statistical analysis confirmed the significance of the findings. The rejuvenator effectively enhanced the properties of asphalt mixtures with RAP, allowing for higher RAP utilization than specified in Highway Technical Specification. This study underscores the potential of rejuvenator-modified bitumen in improving the performance and sustainability of asphalt mixtures containing recycled materials.