华南理工大学学报(自然科学版) ›› 2022, Vol. 50 ›› Issue (5): 65-72.doi: 10.12141/j.issn.1000-565X.210595

所属专题: 2022年交通运输工程

• 交通运输工程 • 上一篇    下一篇

基于分子动力学的生物沥青相容性研究

徐宁1 汪海年1† 陈玉1 张然2 丁鹤洋1 马子业1   

  1. 1.长安大学 公路学院,陕西 西安 710064;2.北京建筑大学 土木与交通运输工程学院,北京 100044
  • 收稿日期:2021-09-13 修回日期:2021-10-14 出版日期:2022-05-25 发布日期:2021-10-29
  • 通信作者: 汪海年(1977-),男,教授,主要从事道路工程研究。 E-mail:wanghn@chd.edu.cn
  • 作者简介:徐宁(1993-),男,博士生,主要从事路面材料与结构研究。E-mail:xn@chd.edu.cn
  • 基金资助:
    国家自然科学基金资助项目(51878063, 52078048, 52008029)

Research on the Compatibility of Bio-Asphalt Based on Molecular Dynamics

XU Ning1 WANG Hainian1 CHEN Yu1 ZHANG Ran2 DING Heyang1 MA Ziye1   

  1. 1.School of Highway,Changan University,Xian 710064,Shaanxi,China;2.School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China
  • Received:2021-09-13 Revised:2021-10-14 Online:2022-05-25 Published:2021-10-29
  • Contact: 汪海年(1977-),男,教授,主要从事道路工程研究。 E-mail:wanghn@chd.edu.cn
  • About author:徐宁(1993-),男,博士生,主要从事路面材料与结构研究。E-mail:xn@chd.edu.cn
  • Supported by:
    Supported by the National Natural Science Foundation of China(51878063,52078048,52008029)

摘要: 为了评价木屑热裂解生物油与沥青的相容性,基于分子动力学方法构建了基质沥青、生物油及生物沥青模型,采用分子极性、溶解度参数和结合能指标定量分析了生物油与沥青及其各组分的相容性;同时,借助离析试验对模拟结果进行了验证。结果表明:生物油的溶解度参数与沥青质组分较为接近,两者均具有较强的极性、更容易产生吸附;随着温度升高,生物油与沥青的溶解度参数差逐渐变大,结合能逐渐下降,当生物沥青混合体系温度超过433K时,两者的溶解度参数差和结合能参数会出现明显的劣化;温度达到453K时生物沥青的储存稳定性下降较为明显;为了保证生物油和沥青的相容性,避免高温储存过程中发生严重离析,建议生物沥青的储存温度不宜高于433K。

关键词: 木屑热裂解生物油, 沥青, 生物沥青, 相容性, 分子动力学

Abstract: Molecular models of base asphalt,bio-oil,and bio-asphalt were constructed based on molecular dynamics in order to study the compatibility of wood chip based bio-oil and asphalt,and the compatibility of bio-oil with asphalt and its components was quantitatively analyzed by molecular polarity,solubility parameters,and binding energy.The simulation results were validated with the help of the segregation test.The results show that the solubility parameters of bio-oil are closer to those of asphaltene fraction,both of them having stronger polarities and more susceptible to adsorption.As the temperature increases,the difference in solubility parameters between bio-oil and asphalt gradually becomes larger and the binding energy gradually decreases.The difference of parameters in solubility and the binding energy significantly deteriorates when the system temperature exceeds 433K,and the storage stability of bio-asphalt decreases obviously when the temperature reaches 453K.To ensure the compatibility between bio-oil and asphalt and avoid serious segregation during high-temperature storage,it is recommended that the storage temperature of bio-asphalt should not exceed 433K.

Key words: wood chip pyrolysis bio-oil, asphalt, bio-asphalt, compatibility, molecular dynamics

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