United States Department of Transportation
i
Improving the sustainability of asphalt pavements through developing a predictive model with fundamental material properties.
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2009-08-01
[PDF-949.35 KB]
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Abstract:This study presents the numerical implementation and validation of general constitutive relationships for describing the
nonlinear behavior of asphalt concrete mixes. These constitutive relationships incorporate nonlinear viscoelasticity and
viscoplasticity to predict the recoverable and irrecoverable responses, respectively. The nonlinear viscoelastic deformation
is modeled using Schapery’s model; while the irrecoverable component is represented using Perzyna’s viscoplasticity
theory with an extended Drucker-Prager yield surface and plastic potential that is modified to capture the distinction
between the compressive and extension behavior of asphalt mixes. The nonlinear viscoelastic and viscoplastic model is
represented in a numerical formulation and implemented in a finite element (FE) code using a recursive-iterative algorithm
for nonlinear viscoelasticity and the radial return algorithm for viscoplasticity. Then, the model is used to analyze the
nonlinear viscoelastic and viscoplastic behavior of asphalt mixtures subjected to single creep recovery tests at different
stress levels and temperatures. This experimental analysis includes the separation of the viscoelastic and viscoplastic strain
components. Based on this separation, a systematic procedure is presented for the identification of the material parameters
associated with the nonlinear viscoelastic and viscoplastic constitutive equations. Finally, the model
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