Effect Investigation of Ultraviolet Ageing on the Rheological Properties, Micro-Structure, and Chemical Composition of Asphalt Binder Modified by Modifying Polymer

• Published in: Advances in materials science and engineering Vol. 2022; pp. 1 - 19
• Main Authors: Sun, Xiaolong, Xu, Qin, Fang, Guotao, Zhu, Yongqiang, Yuan, Zhengbing, Chen, Qian, Yuan, Junshen
• Format: Journal Article
• Language: English
• Published: New York Hindawi 23.05.2022; John Wiley & Sons, Inc; Wiley
• Subjects: Aging; Asphalt pavements; Binders (materials); Carbonyls; Chemical composition; Functional groups; Investigations; Ion beams; Microcracks; Polymers; Rheological properties; Rheology; Scanning electron microscopy; Temperature effects; Thermal stability; Thermogravimetric analysis; Thermophysical properties; Ultraviolet radiation; Viscoelasticity; Viscosity; United States > US
• ISSN: 1687-8434; 1687-8442
• DOI: 10.1155/2022/7190428

In order to investigate the effect of nano polymer materials on the UV aged performance of asphalt binder, a nano PA modifying agent was selected to prepare modified asphalt. Under the effect of UV radiation, the modifying effect of nano PA on the rheological properties of asphalt was studied. With the extension of UV ageing time, the microstructure variation of PA modified asphalt was characterized by using a focused ion beam scanning electron microscope (FIB-SEM). The thermophysical properties of PA modified asphalt were investigated by thermogravimetric analysis (TG). Furthermore, the functional group compositions of PA modified asphalt were investigated by dynamic FTIR. The results showed that with the extension of UV ageing time, the PA modifier could mitigate the ageing effect of UV radiation on the asphalt binder. PA modifier could achieve an increasing effect on the viscoelasticity of asphalt during the UV ageing process. PA modifier suppressed the generation of microcracks in the surface microzone of UV aged asphalt samples. PA modifier could promote the thermal stability improvement of asphalt binder when subjected to UV radiation. The generation of carbonyl and sulfoxide groups in asphalt was inhibited during the UV ageing period, which indicated that the UV induced reaction of asphalt could be postponed by the PA modifying agent.