A Manual for Design of Hot Mix Asphalt with Commentary

This report presents a mix design manual for hot mix asphalt (HMA) that incorporates the many advances in materials characterization and mix design technology developed since the conclusion of the Strategic Highway Research Program (SHRP). The manual also includes a mix design method for warm mix asphalt (WMA). The report will be of immediate interest to materials engineers in state highway agencies and industry. The manual's key features are (1) a single mix design method applicable to dense-graded, open-graded, and gap-graded HMA and WMA; (2) the application of a range of performance tests and criteria to estimate potential permanent deformation, fatigue cracking, and low-temperature cracking behavior of HMA and WMA mix designs; (3) integration of mix and structural design through the use of the Mechanistic-Empirical Pavement Design Guide (MEPDG) software to validate HMA performance for specific combinations of pavement structure, climate, and traffic; and (4) the extensive use of examples to illustrate all facets of the mix design method. Detailed technical discussion to support the methodologies and processes included in the manual are presented in the commentary following the final chapter.