Investigation of thermal degradation of asphalt binders during storage and transportation. (20th January 2020)

• Record Type: Journal Article
• Authors: Zhou, Zhenjun; Wang, Junyan; Cong, Peiliang
• Is Part Of: Construction & building materials. Volume 231(2020)
• Publication Date: 2020-01-20
• Subjects: Asphalt binders -- Degradation -- Aging -- Molecular weight -- Chemical structure; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.117196
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Effects of factors on the properties of PMAs during storage in sealed contain. For TDTTA, the effects of heat on PMAs are greater than that of base asphalt binders. The properties deterioration rate in asphalt binders after DTTAT is not as serious as asphalt binders after TFOT. The performance degradation of PMAs cannot be ignored during storage or transportation. Abstract: A disadvantage of current asphalt performance evaluation systems is that thermal degradation during storage and transportation is rarely considered, especially for polymer modified asphalt binders. The thermal degradation test in thin air (TDTTA) was designed to simulate the aging during storage and transportation. The aim of this study is to evaluate the change in properties of polymer modified asphalt binders during storage and transportation by the convention tests, gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). Based on the above analysis, the main factors affecting the performance of polymer modified asphalt binders were obtained. The results showed that storage time, oxygen concentration and polymer type have a greater impact on the properties erosion, while type of base asphalt binders has a lesser effect. For TFOT or TDTTA, the asphalt binders exhibit performance erosion with aging time increases. Compared with the change in the properties of base asphalt binders after TDTTA, the TDTTA caused a large change in the properties of polymer modified asphalt binders. The degradation in polymer also can be clearly occurred as gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR) results showed. In addition, the chemical structure and physical properties also showed the deterioration after TDTTA aging and different polymer modifiers have different influences. The performance degradation is more obvious when the air/oxygen is present. But the performance degradation needs to pay attention in thin air/oxygen in practical applications.