This activity continues the development of a performance-based specification for hot-mix asphalt. Performance-based specifications describe the desired levels of fundamental engineering properties that are predictors of performance and that appear in primary prediction relationships.A cooperative agreement for this effort was awarded to North Carolina State University in February 2008. This effort addresses the topic of performance specifications by closing the gap of how well we can test and evaluate mixes to quantify expected future performance. The results of this project will provide an improved quality assurance tool. A specification that allows agencies to specify expected performance and provides the ability to reliably quantify how well that expectation is met can help move pavement construction toward an emphasis on long-term performance. The development of performance specifications reside on a continuum from performance-related specifications to performance-based specifications.
Prototype specification with testing protocols. [Source: FHWA, PMSS Database (2013)]