Simulation of the asphalt concrete stiffness degradation using simplified viscoelastic continuum damage model

•Fatigue simulations are made via Simplified Viscoelastic Continuum Damage model.•Four asphalt mixtures were tested including two polymer-modified ones.•Undamaged properties are compared using continuous relaxation spectra function.•A procedure to simulate damage growth is developed to predict stiff...

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Bibliographic Details
Published in:International journal of fatigue 2020-11, Vol.140, p.105850, Article 105850
Main Authors: Hernandez-Fernandez, Noe, Underwood, B. Shane, Ossa-Lopez, Alexandra
Format: Article
Language:English
Subjects:
Asphalt concrete
Asphalt mixes
Cyclic fatigue
Cyclic loads
Damage assessment
Damage growth
Degradation
Evolution
Fatigue failure
Fatigue strength
Fatigue tests
Linear viscoelastic
Load history
Materials fatigue
Simulation
Stiffness
Stiffness evolution
Viscoelasticity
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Summary:•Fatigue simulations are made via Simplified Viscoelastic Continuum Damage model.•Four asphalt mixtures were tested including two polymer-modified ones.•Undamaged properties are compared using continuous relaxation spectra function.•A procedure to simulate damage growth is developed to predict stiffness degradation.•Polymer-modified mixes showed higher fatigue damage resistance on the simulations. A procedure based on the simplified viscoelastic continuum damage model is developed to simulate asphalt concrete stiffness degradation caused by the application of cyclic loads. Several tests are performed to characterize the linear viscoelastic and fatigue damage properties of four asphalt mixtures. It was found that the piecewise approach proposed to simulate the stiffness evolution successfully describes the damage growth under loads applications. It was also found that the exponential model used to fit the characteristic curves best describes the stiffness evolution for the entire load history. Finally, stiffness evolution simulations showed higher fatigue resistance for polymer-modified mixtures.
ISSN:0142-1123
1879-3452
DOI:10.1016/j.ijfatigue.2020.105850