DETERMINATION OF STRUCTURAL INTEGRITY OF SECONDARY ROADS USING FALLING WEIGHT DEFLECTOMETER DEVICE . THIRD INTERNATIONAL CONFERENCE ON BEARING CAPACITY OF ROADS AND AIRFIELDS. PROCEEDINGS, NORWEGIAN INSTITUTE OF TECHNOLOGY, TRONDHEIM, NORWAY, JULY 3-5 1990. VOLUMES 1-2

This paper presents a brief variational analytical study of the sensitivity of a falling weight delfectometer (FWD) in calculating the moduli of different road layers in conjunction with computer programs using state-of-the-art elasto-static analysis. Based on the findings of this study, it proposes new receiver spacings for existing FWDs. Though the study concentrates on secondary roads, the ranges of moduli and thicknesses considered are relevant to several other types of road and are also applicable to many flexible pavements. The following conclusions are drawn: (1) it is desirable to match the measured and theoretical deflections at all seven sensor locations within 5%, but deflections of the first two and last three sensors should be matched closely if the total match of all seven is not possible; (2) errors in estimating of the thicknesses of the layers above the subgrade may cause over 50% error in the estimated values of the moduli; (3) the typical 30 cm spacing between sensors is unsuitable for determining the properties of the pavement layers of secondary roads; (4) a specific sensor configuration is proposed that may be more sensitive to the top layers of the road. (TRRL)

  • Availability:
  • Corporate Authors:

    Tapir

    Trondheim University, Gloeshaugen
    Trondheim-NTH,   Norway 
  • Authors:
    • Nazarian, S
    • Briggs, R C
  • Publication Date: 1990

Language

  • English

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Filing Info

  • Accession Number: 00612254
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 82-519-1033-1
  • Files: ITRD, TRIS
  • Created Date: Aug 31 1991 12:00AM