Evaluation of performance characteristics of asphalt mixtures modified with renewable oils and reclaimed asphalt pavement (RAP)

Over the years, there has been a significant production of Reclaimed Asphalt Pavement (RAP) from asphalt pavement maintenance and rehabilitation processes. This material is typically thrown away and has negative impacts on the environment. However, it can be reused for pavement construction, but it is crucial to use agents that restore its original properties. This study evaluates the impact of two natural renewable oils, sunflower, and soybean, on the properties of neat asphalt and asphalt mixtures that contain RAP. The optimal amount used was 5%. The results show that sunflower and soybean oils are effective in rejuvenating aged asphalt in RAP mixtures by softening the aged binder. As a result, the modified asphalt mixtures exhibit improved resistance to lowtemperature cracks, moisture susceptibility, and permanent deformation.