热氧老化温度对聚合物改性沥青性质的影响规律研究  

Study on the influence of thermal oxidative aging temperature on the properties of polymer modified asphalt

作　　者：刘成 吴晓颖 张东旭 么强 Liu Cheng;Wu Xiaoying;Zhang Dongxu;Yao Qiang(Sinopec(Dalian)Petrochemical Research Institute Co.,Ltd.,Dalian 116045,Liaoning,China)

机构地区：[1]中石化(大连)石油化工研究院有限公司,辽宁大连116045

出　　处：《中国胶粘剂》2024年第12期57-62,67,共7页China Adhesives

基　　金：中国石油化工股份有限公司重点资助项目(123024)。

摘　　要：不同拌和温度会导致沥青的初始老化状态不同,进而可能影响沥青的长期老化程度和路面使用寿命。为弥补现有研究对短期老化温度和长期老化程度之间关联性的缺乏,本文制备了不同SBS含量(SBS分别占改性沥青总质量的3.0%、4.0%和4.8%)的改性沥青。选择涵盖3种拌和技术的热氧老化温度对改性沥青进行短期老化,并对不同短期老化程度的改性沥青进行不同时间的长期老化试验。对不同老化程度的SBS改性沥青进行60℃动力黏度试验、动态剪切试验和红外定量分析试验等,分析拌和温度对沥青长期老化各阶段宏观和微观性质的影响情况。研究结果表明:(1)在试验时间范围内,改性沥青以60℃动力黏度表征的老化程度,呈现低温拌和<中温拌和<高温拌和的规律,并且压力老化时间越长,老化程度的差值越大。(2)以60℃车辙因子作为老化程度的评价指标时,低温拌和沥青的老化程度在前期低于中温拌和沥青,随着时间的延长,老化程度逐渐趋近于中温拌和沥青。但二者的老化程度一直低于高温拌和沥青,且随着时间的推移,与高温拌和沥青之间的差距逐渐拉大。(3)拌和温度达到183℃时,沥青老化程度急剧增大,且随着压力老化时间延长,老化程度增长趋势增加,实际工程中应尽量控制拌和温度不高于183℃。(4)改性沥青的羰基指数和亚砜指数都随着老化时间的延长而增加,但羰基指数增速逐渐减小,亚砜指数的增速始终很大。Different mixing temperatures can lead to different initial aging states of asphalt,which may affect the long-term aging degree of asphalt and the service life of pavement.In order to compensate for the lack of existing research on the correlation between short-term aging temperature and long-term aging degree,the modified asphalt with different SBS contents(SBS accounted for 3.0%,4.0%,and 4.8%of the total mass of modified asphalt,respectively)was prepared in this paper.The thermal oxidative aging temperature that covered three mixing techniques to perform short-term aging on modified asphalt was selected,and the long-term aging tests on modified asphalt with different degrees of short-term aging for different periods of time were conducted.60℃dynamic viscosity test,dynamic shear test,and infrared quantitative analysis test on SBS modified asphalt with different degrees of aging were conducted,and the influence of mixing temperature on the macroscopic and microscopic properties of asphalt at various stages of long-term aging was analyzed.The research results showed that,(1)Within the experimental time range,the aging degree of modified asphalt characterized by dynamic viscosity at 60℃showed a pattern of low-temperature mixing<medium-temperature mixing<high-temperature mixing,and the longer the pressure aging time,the greater the difference in aging degree.(2)When using the 60℃rutting factor as the evaluation index for aging degree,the aging degree of low-temperature mixed asphalt was lower than that of medium-temperature mixed asphalt in the early stage,and as time went on,the aging degree gradually approached that of medium-temperature mixed asphalt.But the aging degree of both had always been lower than that of high-temperature mixed asphalt,and over time,the gap between them gradually widened.(3)When the mixing temperature reached 183℃,the degree of asphalt aging increased sharply,and as the pressure aging time prolonged,the growth trend of aging degree increased.In practical engineering,the mixing tem

关 键 词：聚合物改性沥青 拌和温度 抗老化性能 动态剪切 

分 类 号：U414.7[交通运输工程—道路与铁道工程] TQ430.7[化学工程]