DYNAFLECT DATA USED FOR ESTIMATING THE STIFFNESS OF INDIVIDUAL LAYERS IN FLEXIBLE PAVEMENTS

THIS INTERIM REPORT ON THE RESEARCH STUDY /APPLICATION OF THE AASHO ROAD TEST RESULTS TO TEXAS CONDITIONS/ DESCRIBES AN ASSESSMENT OF THE LANE-WELLS DYNAFLECT AS A NONDESTRUCTIVE MEANS FOR ESTIMATING THE RELATIVE STIFFNESS OF INDIVIDUAL LAYERS IN A FLEXIBLE PAVEMENT SYSTEM. AN EVALUATION WAS PERFORMED ON DYNAFLECT DEFLECTION DATA OBTAINED IN TESTS OF A STATISTICALLY DESIGNED GROUP OF 27 EXPERIMENTAL TEST SECTIONS. THREE LEVELS OF EACH OF THREE VARIABLES WERE INCLUDED IN THE EXPERIMENT. A COMPOSITE EXPERIMENT DESIGN WAS SELECTED, WHICH BASICALLY CONSISTED OF TWO PARTS /1/ A 1/4 REPLICATE OF A 26 FACTORIAL AND /2/ A STAR CONSISTING OF A CENTER POINT AND 12 POINTS ON THE STAR. THE REPORT INCLUDES /1/ A DESCRIPTION OF THE TEST FACILITY , /2/ THE DYNAFLECT DEFLECTION DATA, /3/ THE DEVELOPMENT OF A MATHEMATICAL MODEL FROM ELASTICITY THEORY, /4/ A DISCUSSION OF ANALYSIS TECHNIQUES, AND /5/ RESULTS OF THE ANALYSIS. IN ADDITION, RESULTS OF SEISMIC TESTS ON THE MATERIALS USED IN THE TEST FACILITY, AND A MULTIPLE ERROR REGRESSION TECHNIQUE ARE DESCRIBED IN THE REPORT. THE RESEARCH LED TO THE FOLLOWING PRINCIPAL CONCLUSIONS' /1/ THE DYNAFLECT DEFLECTION BASINS OF EACH TEST SECTION CAN BE PREDICTED WITH ACCEPTABLE ACCURACY BY AN EQUATION DEVELOPED FROM THE DATA, /2/ THE COEFFICIENTS OF THE EQUATION, EACH RELATED TO THE STIFFNESS OF ONE OF THE 8 MATERIALS INCLUDED IN THE EXPERIMENT, APPEAR TO BE LOGICALLY ORDERED WHEN DEVELOPED IN A SINGLE ANALYSIS OF DATA FROM THE ENTIRE FACILITY, /3/ LOGICAL MATERIAL STIFFNESS COEFFICIENTS COULD NOT BE FOUND BY ANALYSIS OF DATA FROM A SINGLE TEST SECTION. /4/ RAY THEORY SEISMOLOGY APPEARED TO BE INVALID, BUT VELOCITIES DETERMINED BY THE PULSE TECHNIQUE ARE BELIEVED TO BE CORRECT, AND /5/ THE MULTIPLE ERROR REGRESSION TECHNIQUE HAS ADVANTAGES OVER THE CLASSICAL METHOD AND SHOULD BE FURTHER EXPLOITED. /BPR/

  • Supplemental Notes:
    • Hpr-1/6/, STATE 2-8-62-32, BPR 14
  • Corporate Authors:

    Texas State Department of Highways & Public Transp

    11th and Brazos Streets
    Austin, TX  USA  78701

    Texas Transportation Institute

    Texas A&M University System, 1600 E Lamar Boulevard
    Arlington, TX  USA  76011
  • Authors:
    • SCRIVNER, F H
    • Moore, W M
  • Publication Date: 1966-6

Subject/Index Terms

Filing Info

  • Accession Number: 00206286
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Dec 1 1994 12:00AM