Rheological properties of asphalt binder modified with recycled asphalt materials and light-activated self-healing polymers. (30th September 2019)

• Record Type: Journal Article
• Authors: Shirzad, Sharareh; Hassan, Marwa M.; Aguirre, Max A.; Mohammad, Louay N.; Cooper, Samuel; Negulescu, Ioan I.
• Is Part Of: Construction & building materials. Volume 220(2019)
• Page Start: 187
• Page End: 195
• Publication Date: 2019-09-30
• Subjects: Self-healing -- Polymer -- UV light -- Asphalt binder -- Recycled asphalt materials; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.05.189
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Increased stiffness due to the addition of recycled materials and polymer. Improved HT performance due to the addition of recycled materials and polymer. Enhanced LT performance for samples with 5% polymer and 48h UV exposure. Improved elastic behavior of the unmodified binder due to the addition of polymer. Improved fatigue performance of the unmodified binder due to polymer application. Abstract: Ultraviolet (UV), light-activated, self-healing polymers are an emerging technology that was proposed to enhance the elastic behavior of asphalt binder, while improving its self-healing properties. The objective of this study was to evaluate the effects of self-healing polymer on the rheological properties of binder blends prepared with or without recycled asphalt materials. Binder blends were prepared with two different binders (PG 67-22 and PG 70-22M), with or without recycled asphalt materials, and 5% self-healing polymer (Oxetane-substituted Chitosan-Polyurethane). High-Pressure Gel Permeation Chromatography (HP-GPC) results showed an increase in High Molecular Weight (HMW) components in the binder with an increase in stiffness through the addition of recycled materials. A further increase was observed with the addition of self-healing polymer. Fourier Transform Infrared Spectroscopy (FTIR) confirmed High-Pressure Gel Permeation Chromatography (HP-GPC) results with an increase in the carbonyl index. Furthermore, the addition of recycled materials led to an increase in the high-temperature grade and the low-temperature grade of the binder blends, while the self-healing polymer did not have a significant effect on the PG-grade. Overall, the addition of self-healing polymer led to an increase in stiffness and an improvement in the rutting performance, while it did not have a positive effect on low-temperature cracking performance. For unmodified binder (PG 67-22), self-healing polymer incorporation improved the elastic and fatigue cracking properties of the binder. However, when it was added to a polymer-modified binder (PG 70-22M) and/or binder blends containing recycled asphalt materials, the potential of this material was low to negative on the low temperature and fatigue cracking performances.