A byproduct of changes in bitumen quality is the trend for engineers to formulate asphalt mixes using a balanced mix design approach. This relatively new method accounts for variable bitumen specifications while prioritizing adherence to performance standards. Balanced mix design also allowed for incorporation of additives that can enhance the functional properties of a mix to improve performance outcomes. Rather than relying solely on binder or aggregate specifications to meet performance standards, all aspects of the mix (binder, aggregate, modifiers, and additives) are formulated to balance factors such as fatigue, rutting, and cracking characteristics.
What Does High-RAP Mix Design Mean and Does It Work?
High-RAP mix design has become central to conversations as sustainability and performance expectations continue to reshape the asphalt industry. Contractors, agencies, and producers are asking the same core questions: What qualifies as high RAP? How does RAP use affect asphalt mix design? Does high-RAP mix design actually work?  Understanding the role of reclaimed asphalt pavement (RAP) and the increasing importance of [...]
