Yu Huanan, Bai Xianping, Qian Guoping, Wei Hui, Gong Xiangbing, Jin Jiao, Li Zhijie
National Engineering Laboratory for Highway Maintenance Technology, School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China.
School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China.
Polymers (Basel). 2019 Jul 1;11(7):1111. doi: 10.3390/polym11071111.
Styrene Butadiene Styrene (SBS) polymer-modified asphalt binders have become widely used in asphalt pavement because of their advantages in high- and low-temperature performance and fatigue resistance. Asphalt pavement is inevitably exposed to sunlight and ultraviolet (UV) radiation during its construction and service life. However, consideration of the aging effect of UV radiation is still limited in current pavement design and evaluation systems. In order to evaluate the impact of UV radiation on the aging properties of SBS-modified asphalt binders, UV aging tests were performed on Rolling Thin Film Oven Test (RTFOT)-aged samples with different UV radiation intensities and aging times. Sixteen different groups of tests were conducted to compare the rheological properties and functional group characteristics of SBS-modified asphalt binders. Dynamic Shear Rheometer (DSR), Bending Beam Rheometer (BBR), FTIR, and SEM tests were conducted to evaluate the aging mechanisms in various UV aging conditions. The results found that UV radiation seriously destroys the network structure formed by the cross-linking effect in SBS-modified asphalt binders, which aggravates the degradation of SBS and results in a great change of rheological properties after UV aging. The nature of SBS-modified asphalt binder aging resulted from the degradation of SBS and the changes of asphalt binder base composition, which lead to the transformation of colloidal structure and the deterioration of asphalt binder performance. The tests also found that continuous UV radiation can increase shrinkage stress in the asphalt binder surface and leads to surface cracking of the asphalt binder.
苯乙烯-丁二烯-苯乙烯（SBS）聚合物改性沥青结合料因其在高低温性能和抗疲劳性能方面的优势，已在沥青路面中得到广泛应用。沥青路面在其施工和使用寿命期间不可避免地会受到阳光和紫外线（UV）辐射。然而，在当前的路面设计和评估系统中，对紫外线辐射老化效应的考虑仍然有限。为了评估紫外线辐射对SBS改性沥青结合料老化性能的影响，对经过旋转薄膜烘箱试验（RTFOT）老化的样品进行了不同紫外线辐射强度和老化时间的紫外线老化试验。进行了16组不同的试验，以比较SBS改性沥青结合料的流变性能和官能团特性。通过动态剪切流变仪（DSR）、弯曲梁流变仪（BBR）、傅里叶变换红外光谱仪（FTIR）和扫描电子显微镜（SEM）试验来评估各种紫外线老化条件下的老化机理。结果发现，紫外线辐射严重破坏了SBS改性沥青结合料中由交联效应形成的网络结构，这加剧了SBS的降解，并导致紫外线老化后流变性能发生很大变化。SBS改性沥青结合料老化的本质是由于SBS的降解和沥青结合料基础组成的变化，这导致了胶体结构的转变和沥青结合料性能的恶化。试验还发现，持续的紫外线辐射会增加沥青结合料表面的收缩应力，并导致沥青结合料表面开裂。
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