Effects of Physical Hardening on Low-Temperature Properties of Asphalt Binders Containing Reclaimed Asphalt Pavement

What is it about?

Recycled asphalt pavement (RAP) material is widely used in sustainable construction of the asphalt pavement. Although there are some studies on the effect of RAP materials on the mechanical properties of asphalt binders, the effect on the thermoreversible aging has never been investigated. In this paper, the physical hardening rate from the dynamic mechanical analysis (DMA) test and grade loss deduced by the extended bending beam rheometer (Ex-BBR) experiment were used to characterize the thermoreversible aging of the RAP modified asphalt binder at the low temperature, and their relationships were also investigated. In addition, the difference of performance change of asphalt binder with different wax content after the addition of the RAP materials was discussed, and the effect of the RAP binders on the ductile resistance through the double edge notched tension (DENT) test was also studied.

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