Bitumen ageing – Impact of reactive oxygen species

Microevolution of Polymer–Bitumen Phase Interaction in High-Viscosity Modified Bitumen during the Aging of Reactive Oxygen Species

“…The Viennese binder aging (VBA) method was applied to simulate the long-term aging of the BB and the HVMB with reactive oxygen species (ROS). The VBA test is a laboratory aging method proposed by Mirwald and other scholars, , which more closely approximates the realistic service conditions of bitumen. The work by Mirwald et al describes the generation of ROS in the air and the source of ROS-induced aging of binders …”

“…Their findings showed that salt and acidic water greatly accelerated the aging rate of the binder when exposed to UV radiation compared to distilled water . Nevertheless, a number of reactive oxygen species (e.g., O 3 and NO x ) are abundant near the road surface in urban areas, according to the findings of some scholars. , In urban roads, the exhaust of car engines emits trace amounts of NO x , which decompose under the stimulation of visible light to form reactive oxygen atoms (O • ). The reactive oxygen atoms will further combine with oxygen to form O 3.…”

“…The reactive oxygen atoms will further combine with oxygen to form O 3. , As a key aging factor, the reactive oxygen species (ROS) have attracted the attention of some scholars since 2020. ,, PA pavements have well-developed void structures and are in complete atmospheric contact . ROS appears to be more reactive than oxygen, making it easier to combine with the reactive radicals of the binder, hence accelerating the aging of the binder .…”

Regeneration mechanisms of aged SBS modified asphalt from RAP materials: Molecule structure, morphology, phase transition, and interface adhesion characteristics

“…According to recycled asphalt mixture, although there are just 3%-5% of asphalt binders in RAP materials, the regeneration of aged asphalt binder in RAP plays an important role in utilizing the recycled asphalt mixture, and then adding rejuvenator is an effective method to restore the thermal-mechanical and rheological of the binders, which could improve the service life of asphalt pavement [9,10]. During the service of asphalt pavement, the asphalt binder is continuously aged by the thermal oxygen and ultraviolet radiation, that is, the light components (aromatics) are decreasing, and the heavy components (asphaltenes) are increasing, which will lead to the hardening and brittle of asphalt [11][12][13]. Nowadays, the ordinary means of asphalt regeneration is to replenish the light components lost during aging, and restore its chemical composition, physical and rheological properties [14].…”

Anti-aging additives: proposed evaluation process based on literature review

“…Steric hardening (physical ageing) refers to the progressive hardening of asphalt binder when there is the molecular restructuring of its molecules, which can be partially reversed by heat (Masson et al, 2005;Sirin et al, 2018). Oxidation is characterised by the chemical interaction between atmospheric oxygen, reactive oxygen species (ROS), and asphalt molecules which leads to irreversible changes (oxidative hardening) of the chemical and physical properties of the asphalt (Das et al, 2014;Hofko et al, 2020;Petersen & Glaser, 2011). The resistance of the asphalt binder to oxidation depends on its component compatibility or state of dispersion of micellar components (Petersen, 2009).…”