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Article

Influence of Ultraviolet and Oxygen Coupling Aging on Rheological Properties and Functional Group Index of Warm Mix Asphalt Binder

1
National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, China
2
Research Institute of Petrochina Fuel Oil Co. Ltd., Beijing 100195, China
3
PetroChia Karamay Petrochemical Co. Ltd., Karamay 834003, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(19), 4216; https://doi.org/10.3390/ma13194216
Received: 31 July 2020 / Revised: 12 September 2020 / Accepted: 21 September 2020 / Published: 23 September 2020
(This article belongs to the Special Issue Asphalt Road Paving Materials)
Warm-mixed asphalt (WMA) has the characteristics of low mixing temperature and energy consumption, which makes it more suitable than hot-mixed asphalt for plateau regions (the altitude is above 500 m, and the terrain is relatively flat or has a wide area with certain undulations). However, WMA is subject to severe ultraviolet (UV) aging because the UV radiation in plateau areas is more intense. The asphalt’s aging changes its rheological properties inevitably, and thus degrades the asphalt pavement’s performance. Accordingly, the purpose of this paper is to investigate the effect of UV and oxygen coupling aging on WMA’s rheological properties and functional group index. Temperature and frequency sweep tests were performed with a dynamic shear rheometer. At the same time, the functional group index was used as an indicator to compare the changes in the WMA’s infrared spectrum before and after UV aging. The results showed that WMA’s elasticity increased and its viscosity decreased after aging with UV. Under the condition of UV–oxygen isolation, as the aging period increased, the WMA’s rutting factor increased gradually. The degree of improvement was greater than that under the condition of oxygen isolation. In contrast, the time required for the WMA’s complex shear modulus to recover under the condition of UV–oxygen coupling was delayed. An increase in the peak value of infrared spectrum indicates that the WMA has undergone oxygen aging. The presence and change in the carbonyl group reflects the degree of the WMA’s UV aging, and the UV aging condition had a greater effect on the peak values of the carbonyl and sulfoxide groups. View Full-Text
Keywords: warm mix asphalt; UV aging; oxygen aging; rheological properties; functional group index warm mix asphalt; UV aging; oxygen aging; rheological properties; functional group index
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MDPI and ACS Style

Li, H.; Tong, P.; Zhang, X.; Lin, X.; Li, B. Influence of Ultraviolet and Oxygen Coupling Aging on Rheological Properties and Functional Group Index of Warm Mix Asphalt Binder. Materials 2020, 13, 4216. https://doi.org/10.3390/ma13194216

AMA Style

Li H, Tong P, Zhang X, Lin X, Li B. Influence of Ultraviolet and Oxygen Coupling Aging on Rheological Properties and Functional Group Index of Warm Mix Asphalt Binder. Materials. 2020; 13(19):4216. https://doi.org/10.3390/ma13194216

Chicago/Turabian Style

Li, Hailian, Peipei Tong, Xijun Zhang, Xixiong Lin, and Bo Li. 2020. "Influence of Ultraviolet and Oxygen Coupling Aging on Rheological Properties and Functional Group Index of Warm Mix Asphalt Binder" Materials 13, no. 19: 4216. https://doi.org/10.3390/ma13194216

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