DESIGN AND PERFORMANCE OF ASPHALT CONCRETE BASES IN THE STATE OF WASHINGTON

Asphalt concrete bases have been used in the state of Washington since about 1960. We are generally pleased with the roadway performance of pavement structures using asphalt concrete bases, but it does vary. Although we plan to continue the design and use of asphalt concrete bases, we also plan a concentrated investigation into the disappointing performances to identify causes and implement corrective measures to prevent repetition. This report deals with preliminary results from the first few projects we have investigated in which compaction and asphalt quality are suspect. Our data are leading us to believe that asphalt quality is best judged through tests after aging in the Rolling Thin Film Oven. An apparent need for durability tests as well as consistency measurements on asphalts is evident. A modified ductility test at 45 F (7.2 C) is showing some promise to identify asphalts which have given us early hardening.

Media Info

  • Features: Figures; References;
  • Pagination: p. 4-12
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00138802
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 16 1976 12:00AM