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.
Highlights
Asphalt pavement has been widely used in the road field because of its good elasticity and plasticity, high driving comfort and strong load capacity [1,2]
The purpose of this study is to investigate the effect of a warming mix agent on the bonding performance of warm mix asphalt (WMA) under UV aging based on the surface free energy (SFE) theory
SK base asphalt binder with a penetration grade of 90 was used in this study, which was obtained from the SK Petroleum Asphalt Factory, South Korea
Summary
Asphalt pavement has been widely used in the road field because of its good elasticity and plasticity, high driving comfort and strong load capacity [1,2]. Asphalt pavement is made of hot mix asphalt (HMA). HMA needs to heat the asphalt to more than 160 ◦ C, and the temperature of the paving and compaction of the mixture is usually not lower than 140 ◦ C [3]. Heating asphalt and mineral materials consumes a large amount of energy. Large amounts of smoke and toxic gases are emitted during construction, which have many adverse effects on the construction workers and the environment. While global warming and energy shortages are receiving increasing attention, researchers and users in the asphalt industry are working hard to find some environmentally-friendly
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
