Identifying the Fatigue Crack Initiation Behavior of Asphalt Binder under Dynamic Shear Load
Publication: International Conference on Road and Airfield Pavement Technology 2023
ABSTRACT
The crack initiation behavior of asphalt binders plays a significant role in the evolution of fatigue damage. In this study, the crack initiation process of asphalt binders is characterized by employing Griffith’s energy balance principles and the surface energy theory. The localized energy redistribution caused by crack initiation is quantified. A prediction model of crack initiation length is developed based on the asphalt crack initiation criterion. The effect of fatigue loading amplitude and the testing temperature in the progression of crack initiation are further investigated. The results show that the fatigue damage process of asphalt in the time sweep test consists of two stages: crack initiation and “factory-roof” cracking. The material-dependent parameters can be utilized to predict the crack initiation length at different strain levels. The fatigue crack initiation life of asphalt binders is decreased with a greater strain level. However, the crack initiation resistance of the asphalt is enhanced by the decrease of testing temperature.
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Published online: Feb 6, 2024
ASCE Technical Topics:
- Binders (material)
- Continuum mechanics
- Cracking
- Damage (material)
- Dynamic loads
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fatigue (material)
- Fatigue tests
- Fracture mechanics
- Load tests
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Solid mechanics
- Structural dynamics
- Tests (by type)
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