AN INTERPRETATION OF SURFACE DEFLECTION MEASUREMENT USING LINEAR ELASTIC THEORY FOR A FULL-DEPTH ASPHALTIC CONCRETE PAVEMENT

This paper was presented to the New Zealand roading symposium, Wellington, August 1979. It investigates the feasibility of using linear elastic theory to infer the stiffness moduli of a full depth asphalt pavement from surface deflection measurements. A site was instrumented for stress, strain and temperature measurement. These parameters and surface deflection profiles, using both the Benkelman beam and dynaflect, were measured on several occasions and linear elastic theory used to interpret the results. The Benkelman beam deflection bowls were used to develop modulus-temperature relationships for the asphalt layers so that similar subgrade moduli were consistently indicated. The dynaflect results also indicated consistent subgrade moduli. The stress/strain instrumentation program was of limited success. The developed modulus-temperature relationships were used to interpret deflection measurements on four other sites on the pavement. Reasonably consistent results were obtained. The dynaflect deflections indicated less variability between sites than the Benkelman beam deflections. No subgrade strengths could be measured to assess the relative effectiveness of the two devices. Inferred subgrade moduli may be unreliable at pavement temperatures above 35-40 celsius. More work is required to confirm the developed temperature-modulus relationships at pavement temperatures below 25 celsius. The results indicate that the asphaltic concrete layers are quite stiff up to temperatures of 37 celsius. (TRRL)

  • Corporate Authors:

    ARRB Group Limited

    500 Burwood Highway
    Vermont South, Victoria    3133
  • Authors:
    • GRAY, W J
    • Baran, E
  • Publication Date: 1979-7

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 16 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00303784
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • Report/Paper Numbers: Intern Rpt AIR1034-1Monograph
  • Files: ITRD, TRIS, ATRI
  • Created Date: Mar 31 1980 12:00AM