水热耦合老化对橡胶改性沥青性能影响研究
Effect of Hydrothermal Coupling Aging on Performance of Rubber Modified Asphalt
陈振伟 1吴学文 1肖璇 2李平 2刘深德2
作者信息
- 1. 中交第二公路勘察设计研究院有限公司,湖北 武汉 430056
- 2. 长沙理工大学 交通运输工程学院,湖南 长沙 410114
- 折叠
摘要
为研究水热耦合老化对橡胶改性沥青性能的影响,该文模拟热老化及水热耦合老化试验,利用常规指标试验、动态剪切流变试验与凝胶色谱试验从宏观与微观层面研究不同老化环境对沥青高低温性能的影响,利用沥青与集料的低温黏结性试验研究不同老化环境对界面性能的影响.结果表明:相较于热老化,水热耦合老化对橡胶改性沥青的延度与软化点的影响更显著;随着老化时间延长,橡胶改性沥青的车辙因子、相位角与临界温度增加,温度敏感性降低,即橡胶高温性能提高,但在水热耦合老化环境下其变化幅度会更大;热老化和水热耦合老化均导致沥青集料界面性能下降,但后者影响程度更大;大分子含量CLMS(%)与分散度D值均随老化时间延长而增大,但水热耦合老化提高了前期的增长水平;D值和CLMS(%)与软化点和延度具有良好的相关性.
Abstract
To study the effect of hydrothermal coupling aging on the performance of rubber modified asphalt,this article simulated thermal aging and hydrothermal coupling aging tests and investigated the effect of different aging environments on the high-temperature and low-temperature performance of asphalt from macroscopic and microscopic levels through conventional index tests,dynamic shear rheology tests,and gel chromatography tests,as well as the effect of different aging environments on the interfacial properties through low-temperature adhesion tests of asphalt and aggregates.The results show that the effects of hydrothermal coupling aging on the ductility and softening point of rubber modified asphalt are more significant than those of thermal aging.The rutting factor,phase angle,and critical temperature of rubber modified asphalt increase with the increase in aging time,and the temperature sensitivity decreases,meaning that the high-temperature performance of the rubber improves.However,the changes in the hydrothermal coupling aging environment are more significant.Both thermal aging and hydrothermal coupling aging lead to the degradation of the interfacial properties of asphalt aggregates,but hydrothermal coupling aging has a greater influence.The macromolecular content CLMS(%)and dispersity D-value both increase with increasing aging time,but hydrothermal coupling aging increases the degree of growth in the early stage.D-value and CLMS(%)have a good correlation with softening points and ductility.
关键词
橡胶改性沥青/水热耦合/老化/性能Key words
rubber modified asphalt/hydrothermal coupling/aging/performance引用本文复制引用
基金项目
国家重点研发计划(2021YFB2601000)
广西壮族自治区重点研发计划(桂科AB21220070)
广西壮族自治区重点研发计划(2021AB22145)
国家自然科学基金(51878075)
出版年
2024
国家科技期刊平台
NSTL
万方数据