A Micromechanical Viscoelasto‐Plastic Model for Asphalt Mixture

Dai, Qingli; You, Zhanping; Sadd, Martin H.

doi:doi:10.1061/40825(185)2

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A Micromechanical Viscoelasto‐Plastic Model for Asphalt Mixture

ASCE Conf. Proc. doi:http://dx.doi.org/10.1061/40825(185)2

Asphalt Concrete: Simulation, Modeling, and Experimental Characterization (GSP 144)

Proceedings of the R. Lytton Symposium on Mechanics of Flexible Pavements

Qingli Dai¹, Zhanping You², and Martin H. Sadd³

¹Research Associate, Dept. of Environmental and Civil Engineering, Texas A&M University‐ Kingsville, Kingsville, TX 78363, mecdq1@yahoo.com
²Assistant Professor, Dept. of Environmental and Civil Engineering, Texas A&M University‐ Kingsville, Kingsville, TX 78363, zhanping.you@tamuk.edu
³Professor, Dept. of Mechanical Engineering and Applied Mechanics, University of Rhode Island, Kingston, RI 02881, sadd@egr.uri.edu

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Abstract

This paper presents a finite element (FE) micromechanical model for viscoelastoplastic behavior of asphalt mixtures. Asphalt mixture is composed of highly irregular aggregates, mastic (asphalt plus fine aggregate and fines), and air voids. In this paper, the microstructural model of particulate asphalt materials incorporates an equivalent lattice network structure whereby intergranular load transfer is simulated through an effective asphalt mastic zone. The finite element model integrates the ABAQUS user material subroutine with continuum elements for the effective asphalt mastic and rigid body elements for each aggregate. A FE incremental algorithm with a recursive relationship for three‐dimensional (3D) viscoelastic behavior was developed. Chaboche's plastic model was applied, and the constitutive equations were solved using a predictor‐corrector scheme. These algorithms were defined in a 3D user material model for the asphalt mastic to predict global rate‐independent permanent deformation of asphalt materials. The effect of loading rates on the material viscoelastic and viscoelasto‐plastic behavior was investigated using FE numerical simulations for an ideal asphalt mixture specimen.