SUPERPAVE GYRATORY COMPACTION GUIDELINES - EXECUTIVE SUMMARY; EVALUATION OF THE SUPERPAVE GYRATORY COMPACTION PROCEDURE - FINAL REPORT AND APPENDIX TO THE FINAL REPORT

This report documents and presents the results of a study of the refinement of the Superpave gyratory compactor, National Cooperative Highway Research Program (NCHRP) Project 9-9. The information includes the results of a literature search, gyratory compactor questionnaire results, laboratory testing, and conclusions and recommendations. Project work included developing mixture design procedures for gap graded and large stone mixtures, evaluating the possible reduction of the number of compaction levels (N sub design), an evaluation of using the mixture's compaction temperature as the short term aging temperature in lieu of the standard aging temperature, developing compaction levels for mixtures below 100 mm in the pavement structure, an evaluation of the N sub initial and N sub maximum gyratory compaction requirements, an evaluation of the backcalculation of specimen densities from N sub maximum, and a revision of AASHTO TP-4. Various laboratory prepared and field obtained mixtures were evaluated in the Superpave gyratory compactor. The evaluation consisted of an extensive analysis of the volumetric and densification properties of the compacted mixtures. The results of the study indicate that gap graded and large stone mixtures can be successfully designed in the gyratory compactor, the number of gyration levels can be reduced substantially from the present levels, the number of gyrations for mixtures placed below 100 mm in the pavement structure can be reduced from that required for surface mixtures, and changes to the N sub initial and N sub maximum gyratory compaction requirements should be made.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/nchrp/cd-1/nchrp_9-9/ex_summary.pdf
• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/nchrp/cd-1/nchrp_9-9/final_report.pdf
• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/nchrp/cd-1/nchrp_9-9/appx.pdf
• Supplemental Notes:
  • Available only on CD-ROM CRP-CD-1, Bituminous Materials Research Series. On the original document, the author "Buchanan" is published as "Buckman".
• Corporate Authors:

  National Center for Asphalt Technology

  Auburn University, 277 Technology Parkway
  Auburn, AL  United States  36830

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Brown, E R
  • Buchanan, M S
  • Anderson, M A
  • Huber, G
• Publication Date: 1998-8

Language

• English

Media Info

• Edition: Final Report
• Pagination: v.p.

Subject/Index Terms

• TRT Terms: Aging (Materials); Backcalculation; Compaction; Density; Gyratory testing machines; Laboratory tests; Literature reviews; Mix design; Questionnaires; Superpave; Temperature
• Identifier Terms: National Cooperative Highway Research Program
• Uncontrolled Terms: Gap graded mixtures; Gyratory compaction; Large stone mixtures
• Subject Areas: Data and Information Technology; Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00784644
• Record Type: Publication
• Report/Paper Numbers: CRP-CD-1, NCHRP Project 9-9
• Files: TRIS, TRB
• Created Date: Mar 1 2002 12:00AM