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.
Video: Balanced Mix Design Benchmarking Strategies
Balanced mix design, or BMD, focuses on engineering asphalt mixes that meet a variety of performance specifications. Going beyond traditional volumetric requirements, BMD requires thorough benchmarking strategies to produce satisfactory results. Benchmarking starts with clearly defined performance standards. These include setting guidelines for resistance to cracking, rutting, fatigue, and moisture damage. Standards should reflect local traffic demands, [...]
