THE STRUCTURAL EVALUATION OF FLEXIBLE HIGHWAY PAVEMENTS USING THE DEFLECTOGRAPH --BEARING CAPACITY OF ROADS AND AIRFIELDS. PROCEEDINGS OF THE 2ND INTERNATIONAL CONFERENCE, PLYMOUTH, ENGLAND, SEPTEMBER 16-18, 1986

The shape of the surface deflection basin of a pavement system under load is not constant, but varies depending on the stiffness, thickness and condition of each of the consistuent layers of the pavement. Measurements of maximum deflection recorded by a deflectograph have been used for assessing pavement performance and overlay design. The deflected shape recorded by the deflectograph can be used to define the properties and thickness of all layers of a flexible pavement. This paper describes the investigation and setting up of an analytical pavement evaluation and design system based on measurements of the deflected shape of the road surface recorded with a deflectograph. Using a three dimensional (3d) finfite element model to carry out a parametric study, the model has been used to relate measurements of the deflected shape of the road to the stiffness and thickness of the layers in the pavement. The finite element model used was calibrated against full scale measurements of absolute deflection developed under the passage of a deflectograph and the system of evaluation developed has been validated by comparing the layer properties predicted with those measured under laboratory dynamic testing of materials sampled from the road and with those measured in-situ.(a) for the covering abstract of the conference see IRRD 815528.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/095111171X
• Corporate Authors:

  WDM LIMITED

  WESTERN WORKS, STAPLE HILL
  Bristol, Avon,   United Kingdom 
• Authors:
  • Bala KUMAR, V
  • KENNEDY, C K
• Publication Date: 1986

Language

• English

Media Info

• Pagination: p. 257-66
• Serial:
  • Publication of: WDM LIMITED
  • Publisher: WDM LIMITED

Subject/Index Terms

• TRT Terms: Conferences; Deflectographs; Finite element method; Flexible pavements; Loads; Pavement design; Pavement layers; Pavements; Stiffness; Strength of materials; Structural strengthening; Tests; Thickness
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 00482204
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-9511117-1-X
• Files: ITRD, TRIS
• Created Date: Apr 30 1989 12:00AM