Virgin Binder Determination for High RAP Content Mixture Design

Reclaimed asphalt pavement (RAP) has been widely implemented in construction due to its cost benefits along with reasonable engineering performance. With the trend of higher RAP applications, it is more critical consider complicated interactions between and virgin binders. An unreasonable assumption full blending material could lead many issues, such as insufficient binder content poor durability. This paper focuses on determination grades during design a high mixture by considering effectiveness. By integrating ratio parameter, modified chart proposed determine PG grade binder, partial method used estimate optimum content. It found that when an 83% considered 40%-content design, differences determined from traditional one within 6° (one grade). If 56% or less for mixture, required base needs drop (6°). Moreover, typically demands 0.5%–1% than Superpave volumetric method, which result significantly improved cracking performance without jeopardizing rutting resistance.