高海拔地区紫外老化对橡胶沥青流变性能及微观结构的影响分析  

Analysis of the impact of UV aging on rheological properties and microstructure of rubber asphalt in high-altitude regions

作　　者：陈望平 马晓燕[2] CHEN Wangping;MA Xiaoyan(Project Execution Department 2 of Xinjiang Transportation Construction Management Bureau,Urumqi 830049;Chang’an University,Xi’an 710061)

机构地区：[1]新疆交通建设管理局项目执行二处,新疆乌鲁木齐830049 [2]长安大学,陕西西安710061

出　　处：《中国建材科技》2025年第1期52-55,共4页China Building Materials Science & Technology

基　　金：陕西省自然科学基金(编号:2021-JQ-262)。

摘　　要：青藏高原高海拔、强紫外线辐射的气候特点容易导致沥青变脆、变硬,加剧沥青路面温度收缩裂缝、龟裂、坑槽等病害的产生。针对高海拔地区紫外光造成的橡胶沥青性能劣化,在室内模拟西宁地区紫外辐射强度,对橡胶沥青进行加速紫外老化试验,分析橡胶沥青流变性能及微观结构变化。结果表明:随着紫外老化的时间延长和强度增加,橡胶沥青的复数模量呈指数增长;橡胶沥青相位角随紫外老化呈线性减小,紫外老化后橡胶沥青的变形恢复性能增加;在紫外老化初期,紫外辐射对橡胶沥青微观结果形貌的影响最显著;随着紫外老化时间进一步延长,橡胶沥青内部形成微观裂缝,其低温抗裂性及抗疲劳破坏性能逐步降低。High altitude and strong ultraviolet radiation in Qinghai Tibet Plateau induce the brittleness and hardening of asphalt,which leads to temperature cracks,pits and other diseases of asphalt pavement.In this paper,the accelerated UV aging test of rubber asphalt is carried out by simulating the UV radiation intensity in Xining area,and the rheological properties and microstructure changes of rubber asphalt are analyzed.The results show that the complex modulus of rubber asphalt increases exponentially with the extension of UV aging time.The phase angle of rubber asphalt decreases linearly with UV aging,and the deformation recovery performance of rubber asphalt increases.UV radiation has the most significant effect on the micromorphology of rubber asphalt.With the further extension of UV aging time,micro cracks are formed in rubber asphalt,and the low-temperature crack resistance and fatigue failure resistance of rubber asphalt are gradually reduced.

关 键 词：道路工程 橡胶沥青 流变性能 AFM 

分 类 号：U414[交通运输工程—道路与铁道工程]