Investigation of the effect of short-term ageing on rejuvenated reclaimed asphalt binder

Because of the deteriorated properties of aged reclaimed asphalt (RA) binder (e.g. increased brittleness), compensation steps should be implemented to achieve a certain level of durability. This compensation can be done by using recycling agents. In this study the effect of recycling agents is investigated by exploring their impact in the binder scale before and after applying short term ageing (STA). Three groups of samples are investigated in this study. The first group are binder blends extracted and recovered from three comparable (in terms of composition and binder content) lab produced asphalt mixtures: one reference mixture with only virgin materials, one with 40% RA (on total binder mass) and virgin binder, one with 40% rejuvenated RA and virgin binder. The second and third set of binder blends are reproduced in the laboratory, using the same materials and compositions as the first set, before and after rolling thin film oven test (RTFOT) ageing accordingly. For all binder samples, penetration, softening point and rheological properties, are determined. Furthermore, the fatigue resistance of the binders is evaluated in terms of Linear Amplitude Sweep (LAS) test. Next, the ageing indexes are investigated in terms of sulfoxides and carbonyls increase using Fourier transform infrared (FTIR) spectroscopy. The objectives of this study are firstly to evaluate the effect of rejuvenating 40% RA binder in terms of binder properties and fatigue performance and secondly to investigate the effect of ageing on binders derived from lab-produced mixtures by comparing them with the RTFOT-aged binder blends. The results show that both ageing due to RTFOT and asphalt mixture production led to similar rheological properties, but different chemical indexes. Concerning the influence of the rejuvenator, the conventional and fatigue properties do not indicate any significant changes. On the other hand, the chemical and rheological properties were influenced.

ISBN:978-90-802884-7-8

Publication year:2021

Keywords:P3 Proceeding

Accessibility:Closed