USE OF ROAD TEST EQUATIONS IN PAVEMENT COST ALLOCATION

HIGHWAY PAVEMENTS ARE DESIGNED TO ACCOMMODATE THE MAGNITUDE AND FREQUENCY OF EXPECTED LOADS WITH DUE CONSIDERATION FOR ENVIRONMENTAL CONDITIONS. THUS, THE MOST SUITABLE METHOD OF DETERMINING PAVEMENT INCREMENTS IS TO START WITH THE DESIGN OF THE PAVEMENT THAT WILL ACTUALLY BE BUILT FOR MIXED TRAFFIC AND, HOLDING ALL FACTORS EXCEPT AXLE LOAD CONSTANT, TO ASCERTAIN BY MEANS OF THE MODIFIED ROAD TEST EQUATIONS THE LOWER DESIGN REQUIREMENTS OF SUCCESSIVELY LIGHTER AXLES. TO HOLD THE TOTAL AXLE APPLICATIONS CONSTANT THE HEAVIEST GROUP OF AXLES IS CONSIDERED TO BE REPLACED BY A LIKE NUMBER OF THE NEXT TO THE HEAVIEST AXLES. THIS PROCESS OF TRANSFERRING AXLES TO THE NEXT LOWER WEIGHT GROUP IS CONTINUED UNTIL FINALLY THE TOTAL NUMBER OF AXLES IN THE TRAFFIC STREAM IS CONSIDERED TO BE THE LIGHTEST WEIGHT GROUP. CONSIDERATIONS OTHER THAN THE NUMBERS AND WEIGHTS OF AXLES IN EACH GROUP DO NOT ENTER INTO THE DETERMINATION OF THE SIZE OF THE PAVEMENT INCREMENT REQUIRED AND THERE IS NO REASON TO LOOK UPON THE FIRST INCREMENT AS A PAVEMENT THAT MIGHT BE BUILT. THE FIRST INCREMENT IS SIMPLY THE PORTION OF PAVEMENT STRUCTURE THAT REMAINS WHEN THE ADDED STRUCTURAL REQUIREMENTS OCCASIONED BY THE HEAVIEST AXLES BECAUSE OF THEIR WEIGHT, BUT NOT THEIR NUMBER, ARE REMOVED. THE PROCEDURE DESCRIBED IN THIS PAPER EVADES THE PROBLEM OF MODIFYING THE TERMS OF THE ROAD TEST EQUATIONS TO MAKE THEM APPLICABLE TO OTHER SOILS AND CLIMATES BY EQUATING THE DESIGNS ACTUALLY USED FOR MIXED TRAFFIC TO THE AXLE-LOAD COMPOSITION OF THE TRAFFIC FOR WHICH THEY ARE BUILT. THE PROCEDURE CAN BE USED WITH ANY METHOD OF MODIFYING THE SINGLE-LOAD EQUATIONS TO MAKE THEM APPLICABLE TO MIXED TRAFFIC. /AUTHOR/

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  • Supplemental Notes:
    • pp 393-398, 4 FIG, 1 TAB Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
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  • Authors:
    • Duzan, H C
    • Oehmann, J C
    • Davis, J M
  • Conference:
  • Publication Date: 1962

Media Info

  • Monograph Title: THE AASHO ROAD TEST - PROCEEDINGS OF A CONFERENCE HELD MAY 16-18, 1962, ST. LOUIS, MISSOURI
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00201868
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 26 1970 12:00AM