不同老化方式下新旧沥青的扩散融合  

Diffusion of Virgin and Aging Asphalt in Different Aging Methods

作　　者：李秀君[1] 董力铭 孙悦 张恒 赵麟昊 LI Xiujun;DONG Liming;SUN Yue;ZHANG Heng;ZHAO Linhao(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China;Netfortune(Shanghai)Aluminum Works Co.,Ltd.,Shanghai 200030,China;Zhejiang Zhixin Testing Technology Co.,Ltd.,Jiaxing 314000,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]上海力进铝制工程有限公司,上海200030 [3]浙江致欣检测技术有限公司,浙江嘉兴314000

出　　处：《建筑材料学报》2024年第2期121-131,共11页Journal of Building Materials

摘　　要：分别制备了热氧老化沥青和热氧-紫外老化沥青,构建了新、旧沥青双层扩散模型,并且通过相对浓度与扩散系数的模拟计算、拉拔试验与荧光显微镜试验研究了新、旧沥青扩散融合程度与温度、沥青四组分的关系.结果表明:热氧-紫外老化沥青更不易与基质沥青扩散融合,与基质沥青的黏附性较差;在10~40℃内,新、旧沥青能够快速扩散融合,超过40℃后,升高温度对扩散融合的促进作用逐渐减小,且对热氧-紫外老化沥青与基质沥青的扩散融合促进作用的减小速率更大;沥青四组分扩散系数的大小顺序依次为:饱和分>芳香分≥胶质>沥青质,经紫外老化后,四组分的扩散系数均有所下降,沥青质的降幅最大.Thermo-oxygen aging asphalt and thermal oxygen-ultraviolet aging asphalt were prepared.The double-layers diffusion model of virgin and aging asphalt was constructed.Through the simulation calculation of relative concentration and diffusion coefficient,verification of pull-off tensile test and fluorescence microscope test,the relationship of diffusion degree with temperature and four components was analyzed.The results show that the thermal oxygen-ultraviolet aging asphalt is more difficult to diffusion with the virgin asphalt,and the adhesion with the virgin asphalt is poor.In the range of 10℃to 40℃,the virgin and aging asphalt can diffuse rapidly.When the temperature is over 40℃,the promoting effect of increasing temperature on diffusion gradually decreases.The decreasing rate of promoting effect is greater for the diffusion of thermal oxygen-ultraviolet asphalt and virgin asphalt.The diffusion coefficients of four components of asphalt from large to small are in the order:saturate>aromatic≥resin>asphaltene.After ultraviolet aging,the diffusion coefficients of the four components decrease.Among them,asphaltene declines most significantly.

关 键 词：道路工程 新旧沥青双层扩散模型 分子动力学 老化沥青 相对浓度 扩散系数 拉拔试验 

分 类 号：U414[交通运输工程—道路与铁道工程]