THE RETAINED THICKNESS INDEX: A QUICK TOOL FOR NETWORK EVALUATION

This paper presents the approach of the Retained Thickness Index (RTI) for the assessment of the residual structural integrity of asphalt pavements on the network level. Lacroix Deflectograph deflections and distress identification served as major input variables. The procedure makes use of the whole deflection basin and is not restricted to application of the maximum deflection only. The approach provides additional data on cracking origin (top-down or bottom-up) and crack propagation, and can be used in combination with the commonly used analysis methods. The RTI is based on the flexural rigidity, inferred directly from the deflection bowl, and the occurrence of cracking observed in the wheelpaths. Both input parameters can be collected quite quickly. Verification of the model was performed in 1996 on some fifty test sections of the Strategic Highway Research Program (SHRP) - The Netherlands programme. This paper describes an attempt to fine tune the methodology. To this end some thirty test sections on the county network of Gelderland were made available, which is gratefully acknowledged by the authors. Analysis of Deflectograph testing, cracking surveys and asphalt coring on cracks contributed to establishing the accuracy of the predictive method.

  • Supplemental Notes:
    • This conference was arranged by the International Society for Asphalt Pavements. The ninth conference will be held in Copenhagen, Denmark in August 2002.
  • Corporate Authors:

    University of Washington, Seattle

    Department of Civil and Environmental Engineering, P.O. Box 352700
    Seattle, WA  United States  98195-2700
  • Authors:
    • Hoyinck, W
    • van Gurp, C
    • Jacobs, M
    • Hiemstra, J
  • Conference:
  • Publication Date: 1997

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 1363-74

Subject/Index Terms

Filing Info

  • Accession Number: 00764728
  • Record Type: Publication
  • Report/Paper Numbers: Volume II
  • Files: TRIS, ATRI
  • Created Date: Jun 16 1999 12:00AM