Energy-Based Kinetics Approach for Coupled Viscoplasticity and Viscofracture of Asphalt Mixtures
Publication: Journal of Engineering Mechanics
Volume 146, Issue 9
Abstract
Permanent deformation and cracking of asphalt mixtures are common distresses of pavement structures. These two damage processes are usually coupled and occur simultaneously. The evolution speed of each process across the temperature spectrum determines which one is more obvious. To more realistically represent this phenomenon, a new approach that combines the energy-based mechanics and kinetics is proposed to separate and model viscoplastic deformation and cracking of asphalt mixtures in this study. First, based on the energy-based mechanistic (EBM) approach, the criterion for crack initiation of asphalt mixtures is formulated, and the dissipated pseudostrain energy for viscoplastic deformation and that for cracking ( and ) are separated at different temperatures. Then, an energy-based kinetics (EBK) approach is proposed with a dimensionless logarithmic rate for an energy changing process and the Arrhenius equation. The kinetic parameters include the activation energies and preexponential factors, which are determined from creep tests for different types of asphalt mixtures under different loading modes and aging conditions. Besides, the viscoelastic–viscoplastic–viscofracture model containing the kinetic models and parameters is established and the weak-form partial differential equations (PDEs) are implemented into a finite element program, COMSOL Multiphysics. The accuracy of the model is verified by the experiment results of asphalt mixtures. In addition, the numerical simulation using the models and parameters from the EBK approach is performed for a typical pavement structure. It successfully evaluates the distributions of viscoplastic strains in the surface layer.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. The available information is listed as follows:
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Creep test data of asphalt mixtures.
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Surface energy test data of asphalt binders.
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Published In
Journal of Engineering Mechanics
Volume 146 • Issue 9 • September 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 8, 2020
Accepted: Apr 24, 2020
Published online: Jul 2, 2020
Published in print: Sep 1, 2020
Discussion open until: Dec 2, 2020
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