SUPERPAVE COMPACTION

SUPERPAVE has revolutionized the technology of asphalt mixture design and analysis. A significant element of this change has been the transition from impact compaction (Marshall) to that of gyratory compaction. The SUPERPAVE Gyratory Compactor (SGC) has been developed from the Texas Gyratory Machine and the French Laboratoire des Ponts et Chaussees (LCPC) gyratory protocol. It is believed that the resulting mixtures more closely resemble those that have been compacted in normal construction practice. By recording the sample height throughout the compaction process, an entire history of compaction may be developed, in contrast to the traditional Marshall impact compaction process, wherein only the final compacted state of the mixture may be examined. There is, however, a fallacy in the method recommended by SUPERPAVE: the resulting "compaction curve" cannot be considered to be fully representative of the compaction history of an "in-service" mixture. This is addressed in this paper. The SUPERPAVE mixture expert task group (ETG) has recognized the concerns of state highway agencies and contractors and recommended that further strength tests be performed for Level 1 mixtures. The current direction for this additional testing is primarily focused on detecting unstable, or rut-susceptible, mixtures. The leading contenders for this type of testing are the many and various flavours of rut-testers: the Hamburg Rut-Tester, the Georgia Loaded-Wheel Tester, the Asphalt Analyzer, etc. These all require the use of added equipment and, in most cases, different sample compaction techniques. The authors propose a testing procedure using the SGC that is simple, direct and inexpensive.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: p. 264-267
  • Monograph Title: CROSSROADS 2000 PROCEEDINGS

Subject/Index Terms

Filing Info

  • Accession Number: 00770508
  • Record Type: Publication
  • ISBN: 096523102X
  • Files: NTL, TRIS
  • Created Date: Oct 15 1999 12:00AM