Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory
Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory
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基于表面自由能理论的紫外老化对温拌沥青粘结性能的影响
DOI：
10.3390/app9102046
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发表时间：
2019-05-02
影响因子：
2.7
通讯作者：
Su, Xiuli
中科院分区：
文献类型：
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作者：
Li, Bo;Wang, Yu;Su, Xiuli
为了探讨紫外线老化对温拌沥青(WMA)粘结性能的影响，在基质沥青中加入Evotherm M1和Sasobit，制备了WMA结合料。在滚动薄膜烘箱试验(RTFOT)后，使用自制的UV老化箱对基质沥青和两种WMA粘结剂进行了老化。作为对比，对RTFOT后的沥青结合料进行了压力老化容器(PAV)试验。采用座滴法测定了UV老化前后WMA粘结剂与蒸馏水、甘油和甲酰胺之间的接触角。根据表面自由能理论，得到了WMA紫外光老化前后的表面自由能及其组成、内聚功、粘附功、剥离功和相容率。结果表明，随着紫外线老化程度的增加，WMA与水的接触角逐渐增大，说明老化增加了沥青的疏水性。经过RTFOT老化、不同时间的UV老化和PAV老化后，SFE及其组分以及所有沥青结合料的内聚功都降低了。紫外光老化后衰减严重，其次是PAV老化和RTFOT老化。随着UV老化时间的延长，粘附功、热拌沥青与石灰石集料的配伍率逐渐降低，剥离功增加，整体粘结性能变差。在RTFOT和PAV的老化作用下，Evotherm M1 WMA的抗剥离能力最强，相容性较好，附着力最好。当Sasobit WMA的紫外光老化时间达到100h时，粘接性能提高。
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.