This report evaluates ADOT's two decades of experience with asphalt-rubber materials. It discusses the chronological development of asphalt rubber by ADOT and the five principle uses of asphalt rubber. The performance of asphalt-rubber materials are determined from historical records and pavement test sections. The performance of asphalt rubber is evaluated by utilizing historical data from ADOT's pavement management system database and by reviewing eight experimental projects which included 47 test sections. Pavement condition distress surveys were performed on several of these projects to determine the terminal condition of the pavements. Asphalt-rubber materials have been placed on over 700 miles of roadway on the State system. This is approximately 10% of ADOT's highway network. Although regularly used on the Interstate System, the principle use has occurred on State and U.S. Routes. The major application has been in mitigating reflective cracking with over 90% of the applications consisting of SAMs and SAMIs. The average life of a SAM is approximately 5 years on the Interstate and 10 years and 8 years for the State and U.S. Routes, respectively. The coefficient of variation in service life ranges between 30%-40% for all three highway classifications. The average life of a SAMI is approximately 9 years for both the Interstate and State Routes while it is only 3 years on the U.S. Routes. Asphalt rubber has successfully been used as an encapsulating membrane to control pavement distortion due to expansive soils and to reduce reflection cracking in overlays on both rigid and flexible pavements. During the 20 years of asphalt rubber use, ADOT has evolved from using slurry applied asphalt-rubber chip seals to utilizing reacted asphalt rubber as a binder in open and dense graded asphalt concrete.

  • Corporate Authors:

    Arizona Department of Transportation

    206 South 17th Avenue
    Phoenix, AZ  United States  85007

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Scofield, L A
  • Publication Date: 1989-12

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 40 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00491745
  • Record Type: Publication
  • Report/Paper Numbers: AZ-SP-8902
  • Created Date: Mar 31 1990 12:00AM