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

In this paper, an image-based micromechanical model for an asphalt mixture's rheological mechanical response is introduced. Detailed information on finite element (FE) modeling based on X-ray computed tomography (X-ray CT) is presented. An improved morphological multiscale algorithm was develop...

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Bibliographic Details
Published in:Materials 2019-06, Vol.12 (13), p.2041
Main Authors: Huang, Wenke, Wang, Hao, Yin, Yingmei, Zhang, Xiaoning, Yuan, Jie
Format: Article
Language:English
Subjects:
Aggregates
Algorithms
Asphalt mixes
Asphalt pavements
Cold flow
Composite materials
Computed tomography
Computer simulation
Constitutive models
Creep (materials)
Finite element analysis
Finite element method
Image classification
Material properties
Mathematical models
Mechanical analysis
Mechanical properties
Medical imaging
Morphology
Mortars (material)
Numerical models
Poisson's ratio
Radiation
Rheological properties
Rheology
Software
Three dimensional models
Triaxial loads
Viscoelasticity
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Summary:In this paper, an image-based micromechanical model for an asphalt mixture's rheological mechanical response is introduced. Detailed information on finite element (FE) modeling based on X-ray computed tomography (X-ray CT) is presented. An improved morphological multiscale algorithm was developed to segment the adhesive coarse aggregate images. A classification method to recognize the different classifications of the elemental area for a confining pressure purpose is proposed in this study. Then, the numerical viscoelastic constitutive formulation of asphalt mortar in an FE code was implemented using the simulation software ABAQUS user material subroutine (UMAT). To avoid complex experiments in determining the time-dependent Poisson's ratio directly, numerous attempts were made to indirectly obtain all material properties in the viscoelastic constitutive model. Finally, the image-based FE model incorporated with the viscoelastic asphalt mortar phase and elastic aggregates was used for triaxial compressive test simulations, and a triaxial creep experiment under different working conditions was conducted to identify and validate the proposed finite element approach. The numerical simulation and experimental results indicate that the three-dimensional microstructural numerical model established can effectively analyze the material's rheological mechanical response under the effect of triaxial load within the linear viscoelastic range.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12132041