ESTIMATION OF PERMANENT DEFORMATION IN ASPHALT CONCRETE LAYERS DUE TO REPEATED TRAFFIC LOADING

Methodology to permit estimation of permanent deformation (rutting) in pavement structures for repeated load triaxial compression and creep tests is discussed. Techniques to estimate the distortion characteristics of asphalt concrete and the use of these data together with linear viscoelastic theory to predict rutting in asphalt-bound layers of pavement structures are concentrated on. Although there is little field data to demonstrate the development of rutting with load repetitions under controlled conditions, Hofstra and Klomp have presented such data from test track studies. The use of the repeated load test data together with elastic theory gives the same form of relation of rut depth versus load applications measured by Hofstra and Klomp suggesting that the procedure has potential to examine this facet of design. When used to study the influence of of various parameters on pavement response, this approach led to the following: Subgrade stiffness appears to have little influence on the accumulation of rutting in the asphalt-bound layer, at least for the stiffness range examined; asphalt concrete stiffness exerts significant influence on rutting in the asphalt-bound layer; and rut depth in the asphalt layer is independent of layer thickness for the range examined. The procedure in which the creep test was used to estimate rutting provided estimates that were very small. Moreover, the shape of the rut depth versus the application relation determined by using this methodology did not resemble the form reported by Hofstra and Klomp. These observations require that a careful evaluation be made to ascertain the reasons for these apparent discrepancies.

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 14-30
  • Monograph Title: SOIL MECHANICS
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00081328
  • Record Type: Publication
  • ISBN: 0309023548
  • Files: TRIS, TRB
  • Created Date: Mar 26 1975 12:00AM