1.北京市城市交通基础设施建设工程技术研究中心;2.北京建筑大学;3.北京建筑大学 土木与交通工程学院;4.北京道路工程质量监督站;5.壳牌（中国）有限公司
北京市自然科学基金面资助项目(8222014)；国家自然科学基金资助项目(52108391)；河北省自然科学基金面资助项目(E2019203559)第一作者：王佳妮(1975-),女,教授级高工,工学博士,主要从事道路材料研发与性能评价及道路检测技术研究.E-mail：wangjiani3328@126.com employed on asphalt samples sliced at various depths, dark temperatures, and duration. The study
1.Beijing Urban Transportation Infrastructure Construction Engineering Technology Research Center, Beijing 100044, China;2.College of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044;3.College of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;4.Beijing Road Engineering Quality Supervision Station Beijing, 100076;5.Shell （China） Limited
Diffusion Behavior of UV-aged Asphalt Based on Infrared Spectroscopy
为研究紫外老化沥青的扩散行为，对不同温度、扩散时长的90#基质沥青试样进行不同深度的切片进行组分分析、红外光谱、原子力显微镜及荧光显微镜测试，对比分析其轻重质组分含量、羰基和亚砜基吸收峰强度、表面微观形貌及荧光显微图像；结果表明，表层老化沥青存在由表及里的扩散，各官能团与四组分沿浓度梯度扩散，羰基和亚砜基含量变化率可较好地反映扩散程度；扩散程度与温度、时长正相关，其中，温度对扩散行为影响最大.
To investigate the diffusion behavior of UV-aged asphalt, component analysis, Fourier-transform infrared spectroscopy, atomic force microscopy and fluorescence microscopy were employed on 90#asphalt sliced at various depths, dark temperatures, and duration. The study Compared and analyzed the contents of light and heavy components, the absorption peak intensities of carbonyl and sulfoxide groups, the surface microstructure and the fluorescence micrograph of asphalt. The results show that diffusion occurs between the surface and interior of UV-aged asphalt, with functional group and components diffusing along a concentration gradient. The content change rate of carbonyl and sulfoxide functional groups effectively reflects the extent of diffusion, which correlates positively with dark temperature and duration, with temperature having the greatest impact on diffusion behavior.
