纳米TiO2/MMT/SBR复合改性沥青抗老化性能评价及机理分析  

Aging resistance evaluation and mechanism analysis of nano-TiO 2/MMT/SBR composite modified asphalt

作　　者：刘朝晖[1] 廖美捷 柳力[1] 刘靖宇[1] 李盛[1] LIU Zhao-hui;LIAO Mei-Jie;LIU li;LIU Jing-yu;LI Sheng(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《长沙理工大学学报（自然科学版）》2020年第2期10-17,共8页Journal of Changsha University of Science and Technology:Natural Science

基　　金：长沙理工大学智能道路与车路协同湖南省重点实验室开放基金资助项目(kfj180703)。

摘　　要：针对西部高原地区年平均气温低、紫外线辐射强,沥青路面易产生老化的问题,采用纳米TiO2/MMT/SBR改性剂制备复合改性沥青,通过高温动态剪切、低温弯曲梁流变和布氏旋转黏度试验对改性沥青热氧老化、光氧老化前后的流变性能进行评价,利用红外光谱试验揭示改性剂的作用机理。结果表明:纳米TiO2/MMT/SBR复合改性沥青高温性能、低温性能及抗老化性能得到改善;分析改性沥青羰基指数可得纳米TiO2/MMT、纳米TiO2/MMT/SBR组试样的抗老化性能远优于其他组合,通过分析砜基、砜类官能团含量可知MMT能抑制亚砜基进一步氧化成砜类。To the problems of low annual average temperature and strong ultraviolet radiation causing asphalt pavement aging easily in the western plateau area,nano-TiO 2/MMT/SBR modifiers were chosen to prepare composite modified asphalt.The rheological properties of modified asphalt before and after aging were evaluated by high-temperature dynamic shear,low-temperature bending beam and Brinell rotating viscosity tests.The mechanism of the modifiers was revealed by the infrared spectrum test.The results show that the high temperature,low temperature and anti-aging properties of nano-TiO 2/MMT/SBR composite asphalt are improved.nano-TiO 2/MMT and nano-TiO 2/MMT/SBR samples have better anti-aging properties than other combinations after analyzing the carbonyl index of modified asphalt.By analyzing the content of sulfoxide and sulfone functional groups,MMT can inhibit sulfoxide group from being oxidized to sulfones.

关 键 词：复合改性沥青 光氧老化 热氧老化 流变性能 电镜扫描 

分 类 号：U414[交通运输工程—道路与铁道工程]