Study on Impact of Maximum Size of Aggregate and Structural Layer on Bituminous Mix Shear Strength by 3D Discrete Element Method

Rutting is induced mainly due to bituminous mix shear flow deformation. To date, most investigations related to the bituminous mix shear performance remain at the experimental level, and few focus on numerical simulation of the shear properties of bituminous mixes, particularly for double-layer or multi-layer bituminous mixes. This paper investigated the impact of maximum size of aggregate and structural layer on the bituminous mix shear strength by a 3D discrete element method (DEM). The uniaxial penetration (UP) test that is an approach for testing the bituminous mix shear strength was briefly depicted. 3D micromechanics-based models employed to predict the bituminous mix shear strength were built via X-ray computed tomography and particle flow code in three dimensions (PFC3D). The impact of maximum size of aggregate and structural layer on shear strength was analyzed in the light of these models. Simulation results were proved against known laboratory UP tests. Results showed that bituminous mix shear strength was able to be simulated or predicted by 3D DEM. Both maximum size of aggregate and structural layer affected the bituminous mix shear strength. Shear strength enhanced with increasing nominal maximum aggregate size. The shear strength of double-layer bituminous mixes was affected more by the bituminous layer with a low shear strength.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; Photos; References; Tables;
  • Pagination: 14p

Subject/Index Terms

Filing Info

  • Accession Number: 01763598
  • Record Type: Publication
  • Report/Paper Numbers: TRBAM-21-00163
  • Files: TRIS, TRB, ATRI
  • Created Date: Dec 23 2020 11:06AM