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Abstract
A rapidly increasing source of reclaimed asphalt (RA) containing polymer-modified bitumen (PMB) offers a potential premium material contribution when performing recycling. This manuscript studies the influence of soft virgin paving grade binder and PMB binder on the rheological properties of three PMB-containing RA binders from different ‘old’ surface-layer asphalt mixtures in Europe, by using the dynamic shear rheometer (DSR). The results indicated that the soft virgin binder and PMB binder can change the flow abilities of RA binder. After the normalisation, the Cole–Cole curve for the modulus can be used to describe the influence of soft fresh binder on the rheological properties of reclaimed binders. The Cole–Cole curve in terms of the viscosity can be used to describe the colloidal shifting of reclaimed binder when blending with fresh binder, and the fresh binder dominated the structure of blended binders. Mixing with soft PMB binder made it possible to rejuvenate the rheological properties of the reclaimed PMB binder. Then, the polymer from the reclaimed binder can still function in a new mixture when recycled.
Funding
The authors are grateful for the financial support from ERA-NET ROAD and a good cooperation between the Wuhan University of Technology (WUT), the Delft University of Technology (DUT), the Netherlands Organization for Applied Scientific Research (TNO), Danish Road Directorate (DRD), and the University of Zilina (UNIZA). This work was supported by the International Science & Technology Cooperation Program of China [grant number 2013DFE83100] and Special fund of central Universities for basic scientific research from Chang’an University (2014G1502012).