Interpretation of the Superpave IDT strength test using a viscoelastic-damage constitutive model

Ibrahim Onifade*, Romain Balieu, Bjorn Birgisson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper presents a new interpretation for the Superpave IDT strength test based on a viscoelastic-damage framework. The framework is based on continuum damage mechanics and the thermodynamics of irreversible processes with an anisotropic damage representation. The new approach introduces considerations for the viscoelastic effects and the damage accumulation that accompanies the fracture process in the interpretation of the Superpave IDT strength test for the identification of the Dissipated Creep Strain Energy (DCSE) limit from the test result. The viscoelastic model is implemented in a Finite Element Method (FEM) program for the simulation of the Superpave IDT strength test. The DCSE values obtained using the new approach is compared with the values obtained using the conventional approach to evaluate the validity of the assumptions made in the conventional interpretation of the test results. The result shows that the conventional approach over-estimates the DCSE value with increasing estimation error at higher deformation rates.

Original languageEnglish
Pages (from-to)421-439
Number of pages19
JournalMechanics of Time-Dependent Materials
Early online date22 Mar 2016
Publication statusPublished - 1 Aug 2016

Bibliographical note

The final publication is available at Springer via

Funding: The authors would like to acknowledge the support of the Swedish Transport Administration (Trafikverket) for funding this research.


  • anisotropic damage
  • asphalt concrete
  • Dissipated Creep Strain Energy
  • Superpave IDT strength test
  • visco-elastic-damage
  • DCSE


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