Accelerated Pavement Testing of Crumb Rubber Modified Asphalt Pavements

The primary objective of this full-scale accelerated pavement testing was to evaluate the performance of unmodified and polymer modified asphalt binders and to recommend improved specification tests over existing SUperior PERforming Asphalt PAVEment (Superpave ®) binder performance grading methodologies. Candidate replacement tests were evaluated via their ability to discern fatigue cracking resistance and rutting. Two fatigue cracking specification tests were identified as more capable in capturing performance than others: binder yield energy and critical tip opening displacement. Two rutting specification tests that quantify irrecoverable deformations exhibited the best strength to capture rutting: multiple stress creep and recovery and oscillatory-based nonrecoverable stiffness. Based on the full-scale performance and laboratory tests, crumb rubber (recycled tires) modified asphalt (Arizona wet process) was shown to significantly slow or stop the growth of fatigue cracks in a composite asphalt pavement structure. A hybrid technique to modify asphalt with a combination of crumb rubber and conventional polymers (terminally blended) exhibited good fatigue cracking resistance relative to the control binder. Also, a simple addition of polyester fibers to asphalt mix was shown to have high resistance to fatigue cracking without the use of polymer modification. The research study also quantified the capabilities of the National Cooperative Highway Research Program's mechanistic - empirical pavement design and analysis methodologies to predict rutting and fatigue cracking of modified asphalts that were not captured in the calibration data from the Long-Term Pavement Performance program. Falling weight deflectometer, multidepth deflectometer, and strain gauge instrumentation were used to measure pavement response. The results illustrated that the nationally calibrated mechanistic - empirical performance models could differentiate between structural asphalt thickness but had difficulty differentiating modified from unmodified asphalt binder performance. Nonetheless, the mechanistic - empirical performance ranking and predictions were enhanced and improved using mixture-specific performance tests currently being implemented using the asphalt mixture performance tester.


  • English


  • Status: Completed
  • Contract Numbers:


  • Sponsor Organizations:

    Florida Department of Transportation

    Research Center
    605 Suwannee Street MS-30
    Tallahassee, FL  USA  32399-0450

    New Jersey Department of Transportation

    1035 Parkway Avenue
    Trenton, NJ  USA  08625

    New York State Department of Transportation

    50 Wolf Road
    Albany, NY  USA  12232

    North Carolina Department of Transportation

    P.O. Box 25201
    1 South Wilmington Street
    Raleigh, NC  USA  27611

    Tennessee Department of Transportation

    James K. Polk Building
    Fifth and Deaderick Street
    Nashville, TN  USA  37243-0349

    Wyoming Department of Transportation

    5300 Bishop Boulevard
    Cheyenne, WY  USA  82009-3340

    Wisconsin Department of Transportation

    P.O. Box 7915
    4802 Sheboygan Avenue, Room 104
    Madison, WI  USA  53707-7915

    Utah Department of Transportation

    4501 South 2700 West
    Project Development
    Salt Lake City, UT  USA  84114-8380

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  USA  78701-2483

    Oregon Department of Transportation

    355 Capitol Street NE
    Salem, OR  USA  97301-3871

    Ohio Department of Transportation

    Research Program
    1980 West Broad Street
    Columbus, OH  USA  43223

    Nebraska Department of Roads

    1500 Highway 2
    Lincoln, NE  USA  68502

    Minnesota Department of Transportation

    Transportation Building
    395 John Ireland Boulevard
    St Paul, MN  USA  55155

    Michigan Department of Transportation

    Murray Van Wagoner Building
    425 West Ottawa, P.O. Box 30050
    Lansing, MI  USA  48909

    Kansas Department of Transportation

    Eisenhower State Office Building
    700 SW Harrison Street
    Topeka, KS  USA  66603-3754

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  USA  50010

    Indiana Department of Transportation

    Indiana Government Center North
    100 North Senate Avenue
    Indianapolis, IN  USA  46204-2249

    Illinois Department of Transportation

    2300 S. Dirksen Parkway
    Springfield, IL  USA  62764

    California Department of Transportation

    1227 O Street
    Sacramento, CA  USA  95843
  • Project Managers:

    Gibson, Nelson

  • Start Date: 20020101
  • Actual Completion Date: 20130404
  • Source Data: RiP Project 34029

Subject/Index Terms

Filing Info

  • Accession Number: 01479209
  • Record Type: Research project
  • Source Agency: Federal Highway Administration
  • Contract Numbers: SPR-2(174)
  • Files: RiP
  • Created Date: Apr 24 2013 1:00AM