Abstract
Biorejuvenators are widely investigated for the restoration of performance properties of aged asphalt. However, thermoreversible aging phenomena in rejuvenated asphalt binder at cold temperatures remain largely unexplored. Three rejuvenators were used to restore aged binder. Extended bending beam rheometer (EBBR) and modulated differential scanning calorimetry (MDSC) testing were used to assess reversible aging tendencies, wax crystallization, and phase separation. Biorejuvenator was found to reduce physical aging in a dose dependent manner. Non-isothermal kinetic analysis based on the Ozawa theory showed that crystallization rate increases with dosage. However, isothermal analysis based on the Avrami theory showed no consistent changes, likely due to the relatively low conditioning temperature employed. Surprisingly, both isothermal and non-isothermal analyses indicated a risk for phase separation, especially at higher dosage levels around 0 °C. Hence, it is critical to determine optimum rejuvenator contents for an effective use in the recycled pavement.
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