Executive Summary : | Reclaimed Asphalt Pavement (RAP) is a popular recycled material in the pavement industry due to its numerous advantages, such as conserving natural resources, reducing transportation needs, reducing greenhouse gas emissions, minimizing landfill space, and reducing construction costs. However, the aging of asphalt limits the percentage of RAP content in asphalt mix, leading to the use of rejuvenators to reduce its effect. Bio-rejuvenators have been a major research focus to comply with sustainable pavement construction. The study aims to investigate the effect of bio-rejuvenators on the performance properties of RAP modified mixtures through laboratory investigations and recommend optimal blending and mix design parameters for developing high RAP mixtures. The scope of the study includes laboratory preparation of bio-rejuvenated RAP derived asphalt, determining optimum bio-rejuvenator dosages, performance evaluation of rejuvenated RAP modified mixtures with various mix combinations, and determining optimal blending and selection criteria for developing rejuvenated RAP modified mixes with high RAP content. Laboratory studies on rejuvenated RAP modified mixtures will help identify mixing specifications, rutting and cracking performance predictive models, performance models for rejuvenated RAP mixes, mix design specifications for high RAP mixes with bio-rejuvenator inclusions, and selection criteria for developing rejuvenated RAP modified mixes with high RAP content. The research findings will provide a comprehensive methodology for developing high RAP mixtures for sustainable and durable pavement systems in top- and intermediate-bituminous layers. |