NCHRP 20-07/Task 412 [Completed]
Adjustments to the Superpave Volumetric Mixture Design Procedure for Selecting Optimum Asphalt Content
[ NCHRP 20-07 (Research for AASHTO Standing Committee on Highways) ]
| Project Data
||National Center for Asphalt Technology|
The objectives of this research were to (1) summarize and evaluate successful approaches currently being used by SHAs to adjust the Superpave volumetric mixture design to obtain higher asphalt binder contents; (2) verify the increase in optimum asphalt content through a limited laboratory experiment that compares successful approaches with the current AASHTO standards; and (3) document these results as proposed appendixes or amendments to AASHTO R 35, AASHTO M 323, or both.
The contractor's final report was provided to the AASHTO Committee on Materials and Pavements, which requested the research, and is available here to download.