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材料导报  2024, Vol. 38 Issue (13): 22040306-7    https://doi.org/10.11896/cldb.22040306
  无机非金属及其复合材料 |
基于有限元和分子模拟的热再生沥青激活行为研究
朱雅婧1, 徐光霁1,*, 马涛1, 范剑伟1, 胡靖1,2
1 东南大学交通学院,南京 211189
2 南京现代综合交通实验室,南京 211100
Finite Element and Molecular Simulation on Activation Behavior of Hot Rejuvenated Asphalt
ZHU Yajing1, XU Guangji1,*, MA Tao1, FAN Jianwei1, HU Jing1,2
1 School of Transportation, Southeast University, Nanjing 211189, China
2 Nanjing Modern Multimodal Transportation Laboratory, Nanjing 211100, China
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摘要 老化沥青的有效激活是影响热再生沥青及混合料性能的关键因素。本工作结合沥青路面就地热再生实体工程,采用有限元方法分析了再生沥青面层摊铺后的冷却过程,获取再生沥青混合料的降温曲线。设计双层扩散试验,研究了再生剂向老化沥青中的扩散规律,并采用分子动力学方法模拟了再生剂与新旧沥青的混溶行为,探讨了温度场、扩散时间和再生剂组分等因素对老化沥青激活再生行为的影响。结果表明,再生沥青面层不同深度处新旧沥青和再生剂之间的扩散存在差异,且短期内难以消除。范德华力是新旧沥青间的主要相互作用,再生剂降低了新旧沥青分子间的范德华力并促进了其相互扩散,扩大了沥青混溶区范围。相比于再生剂中的芳香烃组分,链烃组分更利于减小新旧沥青分子间的范德华力,但提高新旧沥青扩散系数的效果有限。再生剂掺量对提升老化沥青的激活效果存在显著的边际效应递减现象。
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朱雅婧
徐光霁
马涛
范剑伟
胡靖
关键词:  热再生  再生剂  激活行为  有限元  分子动力学    
Abstract: The activation behavior of aged asphalt is a key factor affecting the performance of the hot recycled asphalt and mixture.Based on onehot in-place recycling project of asphalt pavement, the finite element method was applied to analyze the cooling process of the recycled asphalt surface layer after paving, and the cooling curve of the recycled asphalt mixture was obtained.The double-layer diffusion experiment was designed to study the diffusion law of rejuvenator into the aged asphalt, and the mixing behavior of rejuvenator with virgin and aged asphalt was simulated by the molecular dynamics simulation.The effects of the temperature field, diffusion time and rejuvenator composition on the recycling activation behavior of aged asphalt were discussed.Results show that there are differences in diffusion between virgin asphalt, aged asphalt and rejuvenator at different depths of the recycled asphalt surface layer, which is difficult to eliminate in a short term.The van der Waals force is the main interaction between virgin and aged asphalt.The rejuvenator reduces the van der Waals force between virgin and aged asphalt molecules, which promotes their mutual diffusion and expands the range of the asphalt mixing zone.Compared with the aromatic hydrocarbon component in the rejuvenator, the chain hydrocarbon component is more conducive to reducing the van der Waals forces between virgin and aged asphalt molecules, but its effect of improving the diffusion coefficient of virgin and aged asphalt is limited.The rejuvenator content has a significant marginal utility reduction phenomenon on the activation effect of the aged asphalt.
Key words:  hot recycling    rejuvenator    activation behavior    finite element method    molecular dynamics
出版日期:  2024-07-10      发布日期:  2024-08-01
ZTFLH:  U414  
基金资助: 国家自然科学基金(51808116); 南京市重大科技专项(202209012); 江苏省自然科学基金(BK20221468);国家资助博士后研究人员计划资助项目(GZC20230432);江苏省卓越博士后计划资助项目(2023ZB519)
通讯作者:  *徐光霁,东南大学交通学院副教授,博士研究生导师,2009年和2012年于武汉理工大学分别获得工学学士学位和硕士学位,2017年于美国罗格斯大学获得博士学位。主要研究领域为功能型道路材料研发、沥青路面再生利用技术、固废资源化利用技术、道路材料多尺度数值模拟计算。近5年来公开发表学术论文30余篇,授权国家发明专利5项。guangji_xu@seu.edu.cn   
作者简介:  朱雅婧,东南大学交通学院助理研究员,2018年和2022年于东南大学交通学院分别获得学士与博士学位。主要研究领域为改性沥青老化与再生、沥青材料多尺度分析与仿真模拟。公开发表学术论文10余篇,授权国家发明专利5项。
引用本文:    
朱雅婧, 徐光霁, 马涛, 范剑伟, 胡靖. 基于有限元和分子模拟的热再生沥青激活行为研究[J]. 材料导报, 2024, 38(13): 22040306-7.
ZHU Yajing, XU Guangji, MA Tao, FAN Jianwei, HU Jing. Finite Element and Molecular Simulation on Activation Behavior of Hot Rejuvenated Asphalt. Materials Reports, 2024, 38(13): 22040306-7.
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http://www.mater-rep.com/CN/10.11896/cldb.22040306  或          http://www.mater-rep.com/CN/Y2024/V38/I13/22040306
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