Generalized Phenomenological Model for the Viscoelasticity of Idealized Asphalts
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 3
Abstract
A generalized theory for the viscoelastic behavior of idealized bituminous mixtures (asphalts) is presented. The mathematical model incorporates strain rate and temperature dependency as well as nonmonotonic loading and unloading with shape recovery. The stiffening effect of the aggregate is included. The model is of phenomenological nature. It can be calibrated using a relatively limited set of experimental parameters, obtainable by uniaxial tests. It is shown that the mathematical model can be represented as a special nonlinear form of the Burgers model. This facilitates the derivation of numerical algorithms for solving the constitutive equations. A numerical scheme is implemented in a user material subroutine (UMAT) in the finite-element analysis (FEA) code ABAQUS. Simulation results are compared with uniaxial and indentation tests on an idealized asphalt mix.
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Acknowledgments
The authors are very grateful to Professor Vikram Deshpande for his generous assistance with the ABAQUS implementation.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 3 • March 2014
Pages: 399 - 410
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Mar 9, 2012
Accepted: Apr 15, 2013
Published online: Apr 16, 2013
Discussion open until: Sep 16, 2013
Published in print: Mar 1, 2014
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