DEFLECTION ANALYSIS OF FLEXIBLE PAVEMENTS

THREE PARAMETERS ARE USED TO DESCRIBE THE DEFLECTION BASIN CURVE: (1) DYNAFLECT MAXIMUM DEFLECTION, (2) SURFACE CURVATURE INDEX, AND (3) BASE CURVATURE INDEX. MEASUREMENTS PROVIDE A MEANS OF ANALYZING THE BEHAVIOR OF THE PAVEMENT STRUCTURE. THE IBM 360 COMPUTER AND CALCOMP PLOTTER WERE USED IN THE ANALYSIS OF THE DEFLECTION BASIN SHAPE AS WELL AS IN TEMPERATURE AND LAYER EQUIVALENCY STUDIES. THE OBJECTIVE OF THE TEMPERATURE STUDY WAS TO FIND A CORRECTION FACTOR TO USE IN ELIMINATING TEMPERATURE AS A VARIABLE IN DEFLECTION MEASUREMENTS. IT WAS FOUND (1) THAT THE DEFLECTION-TEMPERATURE RELATIONSHIP COULD NOT BE SEPARATED FROM THE MANY OTHER VARIABLES INVOLVED, AND (2) THAT VARIABLES SUCH AS AGE AND SEASONAL VARIATION HAD A LARGE EFFECT ON THE TEMPERATURE-DEFLECTION CURVES. IN THE AREAS OF LAYER EQUIVALENCE, EMBANKMENT HEIGHT, OVERLAY DESIGN AND CONSTRUCTION CONTROL, A GREAT AMOUNT OF USEFUL INFORMATION WAS ACCRUED. AN OVERLAY DESIGN PROCEDURE BASED ON DEFLECTION WAS ESTABLISHED. AREAS OF WEAK EMBANKMENT COULD BE DETECTED PRIOR TO INITIAL SURFACING ALLOWING CORRECTIONS TO BE MADE. ALSO, MINIMUM EMBANKMENT FILL COULD BE DETERMINED WHICH THE DESIGNER COULD USE WITHOUT APPREHENSION. USING THE DYNAFLECT FOR CONSTRUCTION CONTROL INCORPORATED ALL LEVELS OF CONSTRUCTION; HOWEVER, TO BE UTILIZED SATISFACTORILY ON EMBANKMENT MATERIALS, THE EMBANKMENT MUST BE GRADED TO A SMOOTH SURFACE TO ALLOW ACCESS TO THE TEST AREA. RESILIENCE, AGE OF SURFACING, DENSITY, MOISTURE, SOIL SUPPORT, AND VOLUME OF TRAFFIC ARE TREATED BRIEFLY. RESILIENCE WAS FOUND NOT TO EXHIBIT THE STATEWIDE VARIATION THAT HAD BEEN ANTICIPATED. FOR THIS REASON RESILIENCE WAS ELIMINATED AS A SIGNIFICANT FACTOR. AGE OF SURFACE, SOIL SUPPORT, AND VOLUME OF TRAFFIC ARE INCLUDED. /FHWA/

  • Supplemental Notes:
    • Contract No 906
  • Corporate Authors:

    Utah State Department Highways

    /Materials and Test Division
    ,   United States 
  • Authors:
    • PETERSON, G
    • Shepherd, L W
  • Publication Date: 1972-1

Media Info

  • Pagination: 137 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00206486
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Apr 8 1973 12:00AM