摘要
为提高沥青路面的抗紫外老化性能,系统探究了有机膨润土、蒙脱土、水滑石及蛭石4种层状硅酸盐对沥青高温性能、低温性能及黏弹特性的影响。通过熔融共混法制备了层状硅酸盐改性沥青,模拟北京地区紫外辐射条件,结合动态剪切流变仪测试了层状硅酸盐改性沥青的车辙因子、复数模量、蠕变劲度模量和蠕变速率,并利用扫描电子显微镜(SEM)分析了层状硅酸盐与沥青的相容状态。结果表明,层状硅酸盐以片状或颗粒形式均匀嵌入沥青基体,界面结合紧密,无明显团聚。紫外老化后,水滑石改性沥青的抗紫外老化效果最佳,其基于高温性能的抗老化指数为0.63,基于黏弹特性的抗老化指数为0.42,基于低温性能的抗老化指数为0.71,显著优于其他层状硅酸盐改性沥青。该研究揭示了层状硅酸盐的改性效果与机制,为开发高性能抗紫外老化沥青材料提供了理论与技术支撑。
In order to improve the anti-ultraviolet(UV)aging performance of asphalt pavement,the effects of organobentonite,montmorillonite,hydrotalcite and vermiculite layered silicate on the high temperature performance,low temperature performance and visco-elastic properties of asphalt were systematically investigated.Layered silicate modified asphalt was prepared by melt blending method.According to the simulation of ultraviolet conditions,the rutting factors,complex modulus,creep stffness modulus and creep rate of layered silicate modified asphalt were measured by dynamic shear rheometer.The compatibility of layered silicate and asphalt was analyzed by scanning electron microscopy(SEM).The results show that if the layered silicate is embedded into the asphalt matrix in the form of flakes or particles,and the interface will be closely bonded without obvious agglomeration.After UV aging,the anti-aging effect of hydrotalcite modified asphalt is the best,with 0.63,0.42 and 0.71 anti-aging index based on high temperature performance,viscoelastic property and low temperature performance respectively,which is significantly better than the other layered silicate modified asphalt.This study reveals the modification effect and mechanism of layered silicate,and provides theoretical and technical support for the development of high-performance anti UV aging asphalt materials.
作者
郭猛
王露露
管明阳
GUO Meng;WANG Lulu;GUAN Mingyang(The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;State Key Laboratory of Bridge Engineering Satety and Resilience,Ministry of Education,Beijing Unwersity of Technology,Beijing 100124,China;Chongqing Municipal Facilities Operation Guarantee Center,Chongqing 400015,China)
出处
《市政技术》
2025年第8期257-264,共8页
Journal of Municipal Technology
基金
国家自然科学基金(52478429,U24A20198)。
关键词
层状硅酸盐
沥青
流变学
抗紫外老化
改性沥青
laminated silicate
asphalt
rheological
anti-ultraviolet aging
modified asphalt
