沥青分子量及其分布与短期热老化性能的关联性研究  

Correlation between the Molecular Weight and Distribution and the Short-term Thermal Aging Performance of Asphalt

作　　者：姜蔚 张一弛[2] 杜梦雅 赵明婕 黄小侨 余剑英[2] JIANG Wei;ZHANG Yichi;DU Mengya;ZHAO Mingjie;HUANG Xiaoqiao;YU Jianying(Rssearch Instiute of CNPC Fuel Oil Co.,Ltd.,Beijing 100195;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070;CNPC Puel Oil Co.,Ltd.,Bejing 100195)

机构地区：[1]中石油燃料油有限责任公司研究院,北京100195 [2]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [3]中石油燃料油有限责任公司,北京100195

出　　处：《石油沥青》2022年第2期6-11,共6页Petroleum Asphalt

基　　金：中国石油天然气股份有限公司科技项目(RLY-2020Y-07)。

摘　　要：对6种不同原油加工生产的70#沥青进行了薄膜烘箱(TFOT)老化,测试了老化前后沥青的分子量及其分布以及物理性能,对其分子量及其分布与短期热老化性能的关联性进行了分析。结果表明:6种沥青的数均分子量介于564-736,重均分子量介于678-1012,分子量分布介于1.20-1.38。分子量及其分布越小的沥青,TFOT老化后的分子量及其分布增加越明显。沥青的分子量及其分布与其物理性能的变化呈现良好的相关性。沥青的分子量及其分布越大,老化后的软化点增量和黏度老化指数越小,延度保留率越大。Six kinds of 70#asphalts from different crude oils are aged by the thin film oven test(TFOT)The asphalt molecular weight,its distribution and its physical properties are tested before and after aging.The correlation between asphalt molecular weight,distribution and short-term thermal aging performance is analyzed.The results showed that:the number average molecular weight of the six asphalts range from 564 to 736,the heavy average molecular weight range from 678 to 1012,and the molecular weight distribution range from 1.20 to 1.38.The smaller the molecular weight and its distribution,the more obviously the increase of molecular weight and its distribution after TFOT aging.Asphalt molecular weight and its distribution have a good correlation with the changes of physical properties.The larger the asphalt molecular weight and its distri-bution,the smaller the increment of softening point and viscosity aging index after aging,and the greater the retention rate of ductility.

关 键 词：沥青 分子量及其分布 老化 物理性能 关联性 

分 类 号：U414[交通运输工程—道路与铁道工程]