PAVEMENT STRUCTURE CONDITION EVALUATION AND REHABILITATION DESIGN

This article discusses the adoption by Transit NZ of the AUSTROADS' Pavement Design Guide as the recommended method for the structural design of pavements in New Zealand. One of the new Guide's major differences from the superseded NZ Design and Rehabilitation Manual is its greater emphasis on mechanistic design methods and the use of structural deflection testing. The new design procedures use: (1) the central deflection of the pavement under the standard (8t) axle; and (2) the deflection bowl curvature. Thus they provide a meaningful structural evaluation of the effective ability of the pavement layers to spread loads. The falling weight deflectometer (FWD) is an effective instrument for quickly and accurately determining the full dynamic deflection bowl under a standard wheel load. A figure in the article displays an example of the analysis and design for a pavement structural analysis, using an FWD survey. This uses several different graphs, and, if necessary, can also present several alternative designs, including stabilisation, reconstruction, or widening if appropriate. These results display comparative costings, to enable the most economic design to be adopted. For each project, a concise report is prepared, together with tabular and graphical summaries. All data are also supplied on IBM-compatible ASCII disk files.

  • Availability:
  • Corporate Authors:

    Institution of Professional Engineers New Zealand

    158 The Terrace
    Wellington,   New Zealand 
  • Authors:
    • SALT, G
  • Publication Date: 1995-11

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 28
  • Serial:
    • NEW ZEALAND ENGINEERING
    • Volume: 50
    • Issue Number: 10
    • Publisher: Institution of Professional Engineers New Zealand
    • ISSN: 0028-808X

Subject/Index Terms

Filing Info

  • Accession Number: 00720785
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: May 24 1996 12:00AM