Investigation of the load damage exponent of unbound granular materials under accelerated loading

This report details the experimental program, analysis and findings of the assessment of the impacts of axle mass increases on road deterioration for sprayed seal surfaced unbound granular pavements. Load-damage exponents (LDE) ranged between two and four (based on surface deformation) and three to five (based on roughness progression). Overall it was considered that the fourth power law (LDE = 4) was adequate for the types of pavements studied and under the test conditions; however, this value may be conservative in some instances and not in others. The relative performance factors developed ranged between two and eight depending on the extent of axle load increase and the material type. These factors would be useful in the development and refinement of network pavement deterioration models. There were a number of limitations associated with the study and further research is needed if a wider range of material and environmental conditions are to be examined and alternative analysis methods for the estimation of roughness progression developed. (a)

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  • Authors:
    • YEO, R
    • MARTIN, T
    • KOH, S L
  • Publication Date: 2006-12


  • English

Media Info

  • Pagination: 91P
  • Serial:
    • Issue Number: AP-T73/06

Subject/Index Terms

Filing Info

  • Accession Number: 01050919
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 192113982X
  • Files: ITRD, ATRI
  • Created Date: Jun 11 2007 12:56PM