What is a superpave mix design?

A superpave mix design is a performance-based asphalt mix design method developed by the Strategic Highway Research Program (SHRP). This method was introduced to address the limitations of the existing mix design methods by providing a more systematic approach that prioritizes performance characteristics. Superpave, which stands for Superior Performing Asphalt Pavements, utilizes specific testing protocols to evaluate the properties of the asphalt binder and the aggregate, ensuring that the final mix withstands various environmental conditions and traffic loads.

This innovative design method includes specific criteria for selecting aggregate and binder types, as well as guidelines for achieving desired performance levels in terms of durability, rut resistance, and fatigue performance. Superpave mix design also employs the use of performance grading for asphalt binders, which takes into account temperature and loading conditions that may impact pavement performance over time.

In contrast, the other options do not accurately describe the superpave mix design. The first choice references a cost calculation method unrelated to the technical aspects of mix design, while the third choice pertains to operational guidelines that are not specific to the design methodology. Lastly, the fourth option discusses estimating material requirements rather than focusing on the specific properties and performance characteristics assessed in a superpave design.