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Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory

1,2,*, 1,2, 1,2, 1,2 and 1,3,*
1
Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China
2
Key Laboratory of Highway Net Monitoring in Gansu Province, Gansu Hengda Road and Bridge Group Co Ltd., Lanzhou 730070, China
3
Research and Development Center of Transport Industry of Technologyies, Matreials and Equipment of Highway Construction and Maintence, Gansu Road and Bridge Group Co. Ltd., Lanzhou 730050, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(10), 2046; https://doi.org/10.3390/app9102046
Received: 18 April 2019 / Revised: 12 May 2019 / Accepted: 13 May 2019 / Published: 17 May 2019
(This article belongs to the Special Issue Asphalt Materials)
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PDF [3054 KB, uploaded 17 May 2019]
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Abstract

To explore the effect of ultraviolet (UV) aging on the adhesion properties of warm mix asphalt (WMA), WMA binders were prepared by adding Evotherm M1 and Sasobit into base asphalt. The base asphalt and two WMA binders were aged using a self-made UV aging box after a rolling thin-film oven test (RTFOT). As a comparison, pressure aging vessel (PAV) tests were performed for asphalt binders after RTFOT. The contact angles between the WMA binder and distilled water, glycerol, and formamide, before and after UV aging, were measured using the sessile drop method. On the basis of the surface free energy (SFE) theory, the SFE and its components, cohesion work, adhesion work, peeling work, and compatibility rate, before and after the UV aging of WMA, were obtained. The results show that the contact angle between WMA and water gradually increases with the degree of UV aging, which indicates that the aging increases the hydrophobicity of asphalt. After the RTFOT aging, UV aging at different times, and PAV aging, the SFE and its component, as well as cohesion work for all asphalt binders were reduced. The attenuation was severe after UV aging, followed by PAV aging and RTFOT aging. With the extension of UV aging time, the adhesion work, hot mix asphalt, and limestone aggregate compatibility rate gradually reduced, the peeling work increased, and the overall adhesion performance became poor. Under the aging effect of RTFOT and PAV, the Evotherm M1 WMA had the strongest anti-peeling ability, better compatibility, and the best adhesion. When the UV aging time of Sasobit WMA reached 100 h, the adhesion performance increased. View Full-Text
Keywords: pavement materials; warm mixed asphalt; surface free energy; adhesion; ultraviolet aging pavement materials; warm mixed asphalt; surface free energy; adhesion; ultraviolet aging
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Li, B.; Wang, Y.; Ren, X.; Teng, X.; Su, X. Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory. Appl. Sci. 2019, 9, 2046.

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