AN ELASTOPLASTIC CONSTITUTIVE LAW FOR ASPHALT-AGGREGATE MIXTURES

A viscoplastic constitutive law is proposed for the macro-behavior of asphalt-aggregate mixtures. The proposed model is motivated by the following observations: (1) asphalt-aggregate mixtures exhibit residual deformation; (2) asphalt-aggregate mixtures are rate- and temperature-dependent; (3) the presence of an elastic volumetric-deviatoric coupling (ie dilation); and (4) the accumulation of permanent deformation is history-dependent. The proposed model is designed to possess these characteristics. The model consists of two components acting in parallel. The first component is a linear (deviatoric) viscoelastic model consisting of "n" Maxwell elements. The second is an elastoplastic component, where nonlinear elasticity is used to achieve the desired volumetric-deviatoric coupling together with a J2-plasticity model with linear isotropic and kinematic hardening. A set of laboratory tests required to determine the constitutive constants is also presented. The proposed constitutive law was incorporated into a finite element program. The states of stresses, strains, and displacements obtained from a plane strain simulation of a standard pavement section subjected to repetitive loading is provided to illustrate the performance of the proposed model. (A) For the covering abstract see IRRD 883133.

  • Availability:
  • Corporate Authors:

    AA Balkema

    P.O. Box 1675
    Rotterdam,   Netherlands  BR-3000
  • Authors:
    • Weissman, S L
    • Sousa, J B
  • Publication Date: 1996

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00729613
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 90-5410-523-2
  • Files: ITRD
  • Created Date: Dec 26 1996 12:00AM