Constitutive equations used in solving the boundary value problem of flexible pavements employ linear elastic or viscoelastic theory. Accordingly, permanent deformations are calculated based on elastic or viscoelastic deformation laws. Advances in the field of constitutive modeling of materials indicated the need to develop a constitutive relationship that better replicates asphaltic mixture responses under various loading and environmental conditions. In this paper a one-dimensional combo viscoelastic-plastic constitutive model composed of Burger-type mechanical elements connected in series with a friction slider is used. The friction slider is the mechanical representation of plasticity with a DruckerPrager yield criterion. This model is solved under creep phase loading conditions, and the solution is used to develop a rutting model that incorporates a densification phase represented by a relaxing spring. Within the verification of the constitutive model a true yield line has been identified and used instead of the Mohr-Coloumb failure line. The two developed models are supplemented by appropriate experimentation phases to identify and numerically evaluate the relevant parameters. Experimentation is based on actual existing routine methods, with proper adjustments, modifications, or extensions to comply with proper evaluation of the model parameters, and kept as simple as possible to encourage wider user acceptance. An example using actual data is worked out and compared with results obtained from the VESYS III structural subsystem program.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 19-31
  • Monograph Title: Asphalt mixtures and performance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00394926
  • Record Type: Publication
  • ISBN: 0309037506
  • Files: TRIS, TRB
  • Created Date: Nov 30 1985 12:00AM