APPLICATION OF AASHO ROAD TEST RESULTS TO ALABAMA CONDITIONS

AN INVESTIGATION WAS CONDUCTED TO DETERMINE HOW OR WHETHER THE RESULTS OF THE AASHO ROAD TEST MIGHT BE APPLIED TO FLEXIBLE PAVEMENT DESIGN IN ALABAMA. SOME 120 ODD TEST SECTIONS WERE LOCATED ON EXISTING ALABAMA HIGHWAYS AND EVALUATED ACCORDING TO DESIGN AND PERFORMANCE. ATTEMPTS WERE MADE TO RELATE SEVERAL PARAMETERS IN THE AASHO MODEL EQUATION. THE RESULTS WERE UNIFORMLY UNSUCCESSFUL PRIMARILY BECAUSE OF THE HETEROGENEOUS NATURE OF THE BASE AND SUBBASE LAYERS ENCOUNTERED, THE COMPLEX ARRAY OF MATERIAL TYPES AND STRENGTHS THAT DID NOT LEND THEMSELVES TO THE SIMPLIFIED MATERIAL COEFFICIENT APPROACH PROPOSED BY AASHO, TOGETHER WITH CONSTRUCTION METHODS AND QUALITY WHICH VARY WIDELY. A LAYERED SYSTEM MODEL WAS USED, WHICH SATISFACTORILY RELATED PERFORMANCE TO DESIGN, EMPLOYING THE ALABAMA DESIGN INDEX, STRENGTH FACTOR AND LAYER DEPTH (INCHES). UTILIZING THE LAYERED SYSTEM SOLUTION AS A BASIS FOR RELATING PERFORMANCE WITH DESIGN, IT WAS FOUND THAT AN AASHO REGIONAL FACTOR VARYING IN VALUE FROM 0.01 TO 10.0 WOULD BE NECESSARY TO ACCOUNT FOR THE EXTREMES LIKELY TO BE ENCOUNTERED IN ALABAMA.

  • Supplemental Notes:
    • Hpr No 22, PPV-H-7, 23 FIG, 10 TAB, 5 REF, 8 APP
  • Corporate Authors:

    University of Alabama, Tuscaloosa

    Department of Civil Engineering, P.O. Box 870205
    Tuscaloosa, AL  USA  35487-0205
  • Authors:
    • Karrh, J B
    • Stephenson, H K
  • Publication Date: 1967-8

Subject/Index Terms

Filing Info

  • Accession Number: 00205513
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 22 1994 12:00AM