Recycled Asphalt Pavement Mixtures For Road Construction

Abstract

Recycled Asphalt Pavement (RAP) is the most recycled product in the United States, with 80 million tonnes recycled each year, saving taxpayers $1.5 billion. The feasibility of using 100 percent RAP materials in asphalt pavement is investigated in this research. In a typical asphalt factory, asphalt mixes are made at 135°C. However, not all RAP materials' binder may become effective for coating aggregates at 135°C. The study's major goal is to visualise how much effective binder is accessible from RAP inside the asphalt plant. The aged binder in the 100 percent RAP combines can affect the design of the combines and how they interact with virgin binder. To test temperature cracking resistance and fatigue performance, samples were made using a 100 percent RAP mix with no virgin binder and a 100 percent RAP mix with virgin asphalt binder to identify the mix's optimal binder composition. Second, compaction experiments were done on RAP materials to assess the efficacy of the binder. RAP materials were heated at various temperatures and with varied percentages of RAP (10%, 20%, 30%, and 40%). It was discovered that if any virgin binder is used to achieve the optimal asphalt concentration, 100 percent RAP mixtures cannot be produced for field usage. The low temperature grade wasn't within correct limits based on restricted look at findings, but the beam fatigue testing findings were acceptable. Additional heating is required to extend the efficacy of the asphalt binder from RAP materials, based on compaction data.