摘要
为了探究terminal blend(TB)沥青与集料界面的相互作用行为,本文基于分子动力学模拟,利用Materials Studio软件构建基质沥青、TB改性沥青、TB复合SBS改性沥青(TB_SBS)以及TB复合EVA改性沥青(TB_EVA)与集料界面模型.通过结合能、黏附功、相对浓度分布以及接触角试验等手段,对上述4种沥青-集料界面进行综合评估.结果表明,胶粉、SBS和EVA这些改性剂显著提升基质沥青的黏附性能,TB_EVA在不同温度下与基质沥青的黏附功波动较TB_SBS明显,且在较低温度下黏附功提升更显著,较高温度时后者占据更大优势.分析原因可知,橡胶颗粒和EVA改性剂吸收轻质组分充分溶胀,影响沥青质和胶质的聚集分布状态,从而提高沥青与集料的浸润吸附能力和相互作用力.此外,TB_SBS在不同温度下黏附功均维持较高水平且黏附功变化范围不超过2.5 mJ/m^(2),TB_SBS表现出最佳的抗高温性能,是最具沥青-集料界面黏附潜力的沥青,推测SBS中极性较强的S=O基团吸附AS中的—OH基团及存在于BR中的氢原子,导致其与集料的黏附性显著提高,相关结论与接触角试验所得出的结果一致.尽管数量级和数值因温度和空间尺度差异而不同,但试验验证了模拟方法在预测沥青-集料界面黏附过程中的可靠性与合理性.
To investigate the interaction behavior between terminal blend(TB)asphalt and aggregate interface,this paper uses molecular dynamics simulation and Materials Studio software to construct models of matrix asphalt,TB modified asphalt,TB composite SBS modified asphalt(TB_SBS),and TB composite EVA modified asphalt(TB_EVA)and aggregate interface.A comprehensive evaluation of the four asphalt aggregate interfaces was conducted by combining energy,adhesion work,relative concentration distribution,and contact angle tests.The results show that modifiers such as rubber powder,SBS,and EVA significantly improve the adhesion performance of the matrix asphalt.TB_EVA exhibits more significant fluctuations in adhesion work with the matrix asphalt at different temperatures compared with TB_SBS,and the increase in adhesion work is more significant at lower temperatures,with the latter having a greater advantage at higher temperatures.By analyzing the reasons,it can be concluded that rubber particles and EVA modifiers absorb light components and fully swell,affecting the aggregation and distribution of asphalt and resin,thereby improving the wetting and adsorption capacity and interaction force between asphalt and aggregate.In addition,TB_SBS maintains a high level of adhesion energy at different temperatures and the range of adhesion energy variation does not exceed 2.5 mJ/m^(2).TB_SBS exhibits the best hightemperature resistance,and it is a asphalt with the greatest potential for adhesion at the asphalt aggregate interface.It is speculated that the highly polar S=O group in SBS adsorbs the—OH group in AS and the hydrogen atom present in BR,leading to a significant improvement in its adhesion to the aggregate.The relevant conclusions are consistent with the results obtained from contact angle tests.Although the order of magnitude and numerical values vary due to temperature and spatial scale differences,experiments have verified the reliability and rationality of the simulation method in predicting the adhesion process at the asphalt aggregate interface.
作者
袁燕
林梦思
王叶飞
徐松
陈宏宇
YUAN Yan;LIN Mengsi;WANG Yefei;XU Song;CHEN Hongyu(College of Civil Engineering,Fuzhou University,Fuzhou 350108,China;School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,China)
出处
《湖南大学学报(自然科学版)》
北大核心
2025年第11期77-88,共12页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(52278446)
福建省交通运输厅科技项目(202227)。
