Longer Pavement Life from Increased In-Place Density of Asphalt Pavements [ NCHRP 20-07 (Research for AASHTO Standing Committee on Highways) ]
The project final report is available here as NCHRP Research Report 856: Specifying and Measuring Asphalt Pavement Density to Ensure Pavement Performance. It was also provided to the AASHTO Subcommittee on Materials for review and possible action.