Feasibility of the Discrete Element Method to Simulate RAP Asphalt Mixtures’ Fracture Behavior

Fracture of asphalt mixtures was modeled using a heterogeneous 2D-discrete element method (H2DEM). A bilinear cohesive zone model was used to model crack initiation and propagation. Image processing techniques were used to transfer planar images of semi-circular bending (SCB) samples to a two-phase H2DEM model: mastic and coarse aggregates. The sensitivity of the model to the cohesive zone model parameters, coarse aggregate properties, and bond strength was studied to facilitate the calibration process. Experimental data for semi-circular samples with three notch depths of 25.4, 31.8, and 38.0 mm were used. The model calibration had a very good agreement with the experimental results and the model successfully predicted the SCB testing results. The main focus of this paper was to investigate the capability of H2DEM to simulate fracture in asphalt mixtures including RAP, to this end two mixes were included, a control mix and a RAP mix. The results indicated that H2DEM has the capability to capture the stiffening effect of RAP inclusion in asphalt mixes, by adjusting the bilinear cohesive zone model parameters.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References;
  • Pagination: pp 577-587
  • Monograph Title: Geo-Chicago 2016: Geotechnics for Sustainable Energy

Subject/Index Terms

Filing Info

  • Accession Number: 01612423
  • Record Type: Publication
  • ISBN: 9780784480137
  • Files: TRIS, ASCE
  • Created Date: Aug 11 2016 3:07PM