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The National Academies

NCHRP 09-09 [Completed]

Refinement of the Superpave Gyratory Compaction Procedure

  Project Data
Funds: $499,850
Research Agency: Auburn University
Principal Investigator: E. R. Brown
Effective Date: 6/1/1996
Completion Date: 7/31/1998

The objectives of this research were to (1) recommend revisions to the SUPERPAVE gyratory compaction procedure (AASHTO T 312) and related mixture preparation requirements, and (2) recommend SUPERPAVE gyratory compaction procedure(s) for SMA, open-graded, gap-graded, and large stone mixtures.

The key product of the project was a recommendation soundly supported by experimental results to reduce the number of possible design gyration values in AASHTO PP28 (now AASHTO M 323) to 4 from the original 28. This recommendation was accepted by the FHWA Mixture Expert Task Group and referred to the AASHTO Lead States Team and Highway Subcommittee on Materials; it has been incorporated in the standard.

An executive summary of the final report was published as NCHRP Research Results Digest 237. The entire three-volume final report is available on the CD-ROM titled CRP-CD-1: Bituminous Materials Research Series.

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