Abstract
This study presents a framework to identify the low-temperature viscoelastic properties of asphalt concrete using the disk-shaped compacted tension (DC(T)) creep test. Due to the DC(T) geometry, the stress–strain state in the DC(T) geometry is not simple, and a geometry coefficient is needed to characterize the relationship between the mechanical and geometrical properties. The geometry coefficient of DC(T) was calculated by invoking the correspondence principle in viscoelasticity. The DC(T) creep test was conducted on different asphalt mixtures comprised of various components and modifiers at three temperature levels of 0, −12, and −24 °C. The creep compliance function for each of these mixtures was modeled using a generalized Voigt-Kelvin spring-dashpot phenomenological representation. The numerical implementation of the generalized Voigt-Kelvin model was developed in the finite element code Abaqus via a user material subroutine (UMAT). Numerical simulations of DC(T) creep tests using the identified viscoelastic properties are presented, which indicate the capability of the proposed approach to characterize the low-temperature linear viscoelastic behavior of the investigated asphalt mixtures. To further validate the viscoelastic properties obtained from DC(T) test through different stress–strain states, numerical simulation results from an Indirect Tensile Creep Test were compared to experimental results. The close agreement found between the results of indirect tension creep tests and numerical simulations indicates the capability of the proposed approach for identification of viscoelastic properties of asphalt mixtures at low temperatures, which opens the door to avoid the intricate experimental setup and poor repeatability of the indirect tensile creep test at low temperatures.
Published Version
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