Studying the effect of soft bitumen on the rheological properties of reclaimed PMB binder by using the DSR

Journal article (2016)

Authors

Gang Liu Wuhan University of Technology
Liping Li Wuhan University of Technology
Shaopeng Wu Wuhan University of Technology
Martin van de Ven Pavement Engineering - CEG
Research Group
Pavement Engineering (CEG) (TU Delft)
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Published Date

25-06-2016

Language

English

Reuse Rights

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Faculty

Civil Engineering & Geosciences

Department

Engineering Structures

Research Group

Pavement Engineering

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.