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Microstructural Modeling of Rheological Mechanical Response for Asphalt Mixture Using an Image-Based Finite Element

Wenke Huang1, Hao Wang2, Yingmei Yin3

  • 1School of Civil Engineering, Guangzhou University, Guangzhou 510006, China.

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|June 29, 2019
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This study introduces an image-based micromechanical model for asphalt. The finite element model accurately predicts the material's rheological mechanical response under triaxial load.

Keywords:
asphalt mixturemicrostructurenumerical simulationsrheologicalviscoelastic

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Area of Science:

  • Materials Science
  • Civil Engineering
  • Computational Mechanics

Background:

  • Asphalt mixtures exhibit complex rheological mechanical behavior.
  • Accurate modeling of asphalt's response is crucial for infrastructure design.
  • Existing models may not fully capture microstructural effects.

Purpose of the Study:

  • To develop an image-based micromechanical model for asphalt mixtures.
  • To simulate the rheological mechanical response using finite element analysis.
  • To validate the model against experimental triaxial creep tests.

Main Methods:

  • Utilized X-ray computed tomography (X-ray CT) for image-based finite element (FE) modeling.
  • Developed a morphological multiscale algorithm for image segmentation.
  • Implemented a numerical viscoelastic constitutive formulation in ABAQUS UMAT.
  • Obtained material properties indirectly to avoid complex experiments.

Main Results:

  • The image-based FE model successfully simulated triaxial compressive tests.
  • Numerical simulations closely matched experimental results from triaxial creep tests.
  • The model effectively analyzed the rheological mechanical response under triaxial load.

Conclusions:

  • The developed 3D microstructural numerical model accurately predicts asphalt's behavior.
  • The approach provides an effective method for analyzing time-dependent material properties.
  • This image-based modeling technique enhances understanding of asphalt mixture mechanics.