Impact of Laboratory RAP Preheating on the Balanced Mix Design (BMD) Properties of Asphalt Mixtures
IS-146, June 2024
This research reveals the variations in RAP preheating methods among 39 state DOTs and 46 contractors, which can lead to differences in asphalt mixture properties. It emphasizes that different preheating procedures affect recycled binder availability and aging, which in turn influences the volumetric and mechanical properties of asphalt mixtures.
What you'll learn:
- Methods: Discover the four commonly used RAP preheating procedures identified by survey respondents.
- Compare: Authors review relevant literature from the past two decades, reviewing findings on the effects of various RAP preheating procedures on the properties of RAP and corresponding asphalt mixture.
- Research: Understand the methodology and see the test results on RAP binder properties and BMD mixture performance, as indicated by the four most common RAP preheating methods.
“As the industry aims to utilize higher RAP percentages to enhance sustainability, optimizing preheating processes becomes crucial for ensuring consistent and reliable field performance of asphalt mixtures. Standardizing RAP preheating procedures is key to achieving dependable mix design outcomes and maintaining performance standards.”