Balanced Mix Design (BMD) is an asphalt mix design approach that uses performance tests on appropriately conditioned specimens to evaluate multiple types of pavement distress. This method considers factors such as aging, traffic, climate and pavement structure. The current definition is based on AASHTO PP 105-20 and originated from FHWA's Expert Task Group in 2015.
Durability and cracking issues in asphalt pavements have highlighted the shortcomings of traditional volumetric mix design systems. BMD provides a performance-based framework to ensure resistance to pavement distresses during mix design approval and production acceptance.
BMD allows engineers to evaluate recycled materials, additives, and sustainable practices by testing for resistance to cracking, rutting, and moisture damage. As decarbonization becomes more critical, BMD helps ensure innovations still meet or exceed performance requirements.
BMD enables optimization of material use for cost-efficiency and performance. Designers can evaluate how changing components affects both cost and resistance to distresses, leading to more informed decisions.
Round Robin Programs: BMD tests help labs compare performance and variability. Learn more
Lag & Dwell Time Study: NCAT is conducting an ongoing study to evaluate these effects.
Test Track Experiments: