摘要
利用Materials Studio软件建立沥青的四组分模型,利用体积温度曲线得到了该沥青模型的玻璃化转变温度,同时利用差示扫描量热(DSC)试验验证了沥青模型所得玻璃化转变温度的可靠性,并在低于玻璃化转变温度下利用分子动力学从微观上对沥青分子的物理老化现象进行模拟与分析.结果表明:在低于沥青玻璃化转变温度的等温等压条件下,沥青模型随着时间的延长,出现了自由体积减小、密度增大的物理老化现象;低温下沥青质和胶质导致沥青活动性降低,出现了物理老化现象,实现物理老化的微布朗运动的分子活动力主要来自饱和分和芳香分.
The four-component model of asphalt was established by Materials Studio software,and the glass transition temperature of the asphalt model was calculated by volume-temperature curve.The differential scanning calormetry(DSC)test was used to prove the reliability of the glass transition temperature of the asphalt model.At a temperature below the glass transition temperature,molecular dynamics was used to simulate and analyze the physical aging of asphalt molecules from the microscopic level.The results show that under the isothermal and isobaric conditions below the glass transition temperature of asphalt,the asphalt model exhibits a physical aging phenomenon with reduced free volume and increased density over time.At the same time,asphaltene and resin at low temperatures cause physical degradation of asphalt activity,and the molecular activity of micro-Brown movements mainly comes from saturated and aromatic components.
作者
邱延峻
苏婷
郑鹏飞
丁海波
QIU Yanjun;SU Ting;ZHENG Pengfei;DING Haibo(School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;Highway Engineering Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China;School of Chemistry, Queen's University, Kingston K7L, Canada)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2020年第6期1464-1470,共7页
Journal of Building Materials
基金
中央高校基本科研业务费专项资金资助项目(2682019ZT05)
国家自然科学基金青年项目资助(52008352)。
关键词
路面工程
沥青胶结料
低温性能
分子模拟
物理老化
玻璃化转变温度
pavement engineering
asphalt binder
low-temperature performance
molecular simulation
physical aging
glass transition temperature
