摘要
选取70#基质沥青和SBS改性沥青作为研究对象,采用动态剪切流变试验、傅里叶变换红外光谱分析、原子力显微镜研究了不同紫外老化条件下沥青前后的流变性能和微观性能的变化.结果表明,相同老化条件下,70#基质沥青的老化程度大于SBS改性沥青;直接紫外老化条件下沥青老化程度最大,抽提会造成沥青发生热氧老化,都不可直接用于模拟实际沥青路面的老化状况;在沥青混合料紫外老化过程中,水具有一定的阻隔作用;沥青老化过程中,当沥青质数量到达一定程度时,沥青质的微观结构将从"蜂形"结构转换为"白点团聚"和"黑色斑点"结构.
Taking the 70~# asphalt and SBS modified asphalt as the research objects,the rheological properties and microscopic properties of 70~# asphalt and SBS modified asphalt before and after the different UV aging processes were studied with dynamic shear rheological（DSR）、Fourier transform infrared spectroscopy（FTIS）and atomic force microscope（AFM）.The results show that 70~# asphalt is more aged than SBS modified asphalt in the same condition.The aging is the most serious under the direct ultraviolet aging condition and the extraction can lead to the hot oxygen aging of asphalt.They can not be used to simulate the ultraviolet aging condition of the actural asphalt pavement directly.In the process of ultraviolet aging,water can obstruct the asphalt aging.When the asphaltene of asphalt increases to a specific value in the aging process,the micro structure of asphaltene converts from ＂Beeshaped＂to＂White spots reunion＂and＂Black spots＂.
出处
《武汉理工大学学报（交通科学与工程版）》
2018年第1期83-86,92,共5页
Journal of Wuhan University of Technology（Transportation Science & Engineering）
基金
国家重大科学仪器设备开发专项项目(2013YQ160501)
巴基斯坦PKM4项目资助
关键词
沥青
模拟服役状态
紫外老化
流变特性
微观结构
asphalt
simulated service condition
the UV aging
rheological properties
micro structure
