The incorporation of rejuvenator (bio-oil derived from waste wood) into recycled (aged) asphalt binder has become more popular in paving roads. However, the thermal properties of asphalt binder modified by rejuvenator are still largely unclear. The main objective of this study is to investigate the thermal stability and kinetics between bio-oil and aged asphalt with molecular dynamic simulation and experiment. According to previous results, asphalt model with four components including asphaltenes, aromatics, saturates, and oils were built with different bio-oil content. The model of aged binder was constructed by increasing the asphaltenes ratio on the basis of virgin binder. The simulation results was verified by differential scanning calorimeter (DSC) and dynamic shear rheology (DSR) and the thermal stability property of asphalt binders in that it was more susceptible to the changed temperature. Properties calculated from atomistic molecular simulations of the mixtures include density, thermal expansion coefficient, and isothermal compressibility. The thermal kinetic properties suggest a high-frequency glass transition above 15 °C for virgin asphalt and rejuvenated asphalt. The adding bio-oil into aged binder could improve the low-temperature properties of bio-oil rejuvenated asphalt, thus increased the efficiency of regeneration.
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