Abstract
This investigation employed an interrupted torsion fatigue test using the linear amplitude sweep procedure to assess the intrinsic self-healing potential of unaged, aged, rejuvenated, and re-aged asphalt binders. Continuous oscillatory shear strain loading at different damage levels were interrupted with a single rest period of different durations. An index based on the decrease in crack length following the rest period (Ha) has been defined to accurately reflect the occurrence of healing. The results indicate that Ha is higher at lower damage levels and for longer rest-period durations. The amount of irreversible crack growth increased with an increase in crack propagation and aging level. Ha also reflects both the short- and long-term effectiveness of employing a rejuvenator to ameliorate the fracture healing potential of the aged binder. Once the healing indices were established for each fracture damage-rest period, a healing master curve was constructed to provide a complete representation of this phenomenon. It was observed that the effect of aging and rejuvenation was more pronounced at lower reduced rest periods, corresponding to higher fracture damage levels. The area beneath the healing master curves in the selected reduced rest period (H) was considered as a cohesive healing indicator of asphalt binder. Furthermore, Ha was compared with the commonly used healing index (IH) in the viscoelastic continuum damage model for capturing the occurrence of damage recovery immediately after the rest period. It was found that for the binders in the unaged state IH underestimated the healing potential.
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Asadi, B., Tabatabaee, N. & Hajj, R. Crack-based healing master curve derived from linear amplitude sweep tests: a cohesive healing indicator for asphalt binders. Mater Struct 54, 170 (2021). https://doi.org/10.1617/s11527-021-01727-5
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DOI: https://doi.org/10.1617/s11527-021-01727-5