VISCOELASTIC DEFORMATIONS IN A TWO-LAYERED PAVING SYSTEM PREDICTED FROM LABORATORY CREEP RESULTS

A new viscoelastic method developed to calculate deformations in a two-layered flexible pavement system subjected to both single and repeated moving loads is described. On the basis of laboratory creep experiments the rheologic behavior of all asphalt-bound materials can be represented in viscoelastic equations by a simple analytical expression for creep compliance. The mathematical analysis is performed by (a) calculating the viscoelastic deformations (vertical, transverse, and longitudinal strains) around the moving load and (b) predicting the repeated load effect, considering the effects of velocity and waiting time between two consecutive loads. The theory is applied to the asphalt pavement design for a steel slab bridge on an Italian motorway. Calculated deformations are compared with actual deformations, measured by means of strain gauges incorporated into the asphalt layers. Temperature for tests and calculations was 40 deg C (104 deg F). Both the theoretical predictions and the experimental results show that recovery is considerably delayed for the vertical and the transverse elongational deformations only. No delay was observed for the longitudinal deformation. The contribution of delayed viscoelastic deformations to total deformations was found to be relevant under some actual traffic conditions.

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References;
  • Pagination: pp 34-38
  • Monograph Title: Multiple aspects of soil mechanics
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00178222
  • Record Type: Publication
  • ISBN: 0309026695
  • Files: TRIS, TRB
  • Created Date: Jul 19 1978 12:00AM