Asphalt mixtures self-healing test protocol proposal based on the S-VECD model
DOI:
https://doi.org/10.14295/transportes.v28i4.2028Keywords:
Asphalt, damage. Healing. Fatigue. Modeling.Abstract
The phenomena associated with fatigue and healing of asphalt materials have their importance already recognized in several works. The present study applies the S-VECD model for direct tensile fatigue test in controlled strain mode for asphalt mixtures, with the insertion of rest periods, aiming at evaluating material’s self-healing (integrity recovery). From different rest periods, test temperature and material pseudo-stiffness levels, an internal state variable of healing (H) capable of modeling these conditions into a single parameter is proposed. The insertion of this internal state variable in a model that quantifies the material healing (%HS) in the characteristic damage curve space of the material - C versus S - provides a tool that accurately predicts the healing index of the evaluated mixture.
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