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, climate, and typical pavement failures. 

Next, testing methods must be selected. These tests are designed to simulate real-world stressors and help assess long-term durability of the mix. Common tests for rutting resistance include the Hamburg Wheel Tracking Test, the Asphalt Pavement Analyzer, and the French Rutting Tester. For Fracture Toughness, engineers can use the Indirect Tensile Cracking Test (IDEAL-CT), the Semi-Circular Bend Test, or the Disc-shaped Compact Tension (DCT) test, among others.  

Benchmark guidelines are also used to help mix designers compare legacy data with lab results. In turn, engineers are able to evaluate their targets against other field performance examples. Pilot projects and shadow testing can help refine benchmarks before moving forward with a mix design.  

Benchmarking strategies are a crucial component of balanced mix design. They can help with material use and cost savings as well as achieving sustainability goals through optimized resource allocation. BMD benchmarking can also lead to more efficient additive use to improve mix performance outcomes.  

Sripath supports engineers with the additives and insight to help them achieve their mix performance goals. Learn more about balanced mix design and our asphalt additive portfolio by visiting www.sripath.com. 

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