Journal
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
Volume 35, Issue 3, Pages 205-218Publisher
WILEY
DOI: 10.1111/j.1460-2695.2011.01607.x
Keywords
continuum damage; dynamic modulus; direct tension test; hot-mix asphalt; viscoelasticity
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This paper describes testing and evaluation of the fatigue resistance potential of hot-mix asphalt mixtures using viscoelastic continuum damage analysis, which is based on dynamic modulus determination, a state-variable approach and damage calculation. The dynamic modulus test for stiffness characterization and the direct tension test for fatigue resistance characterization were used in the testing procedure. The state-variable approach can be used for numerical computation of a viscoelastic convolution integral. A NelderMead simplex search was used in this study to determine the damage parameter of a stiffness reduction function. The fatigue resistance was evaluated as a function of loading rate, asphalt binder content, modifier (e.g. usage of hydrated lime), and temperature, and was found experimentally to have a strong dependence on these factors.
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