摘要
为了进一步验证生物质油改性沥青在沥青路面中应用的可行性,将不同掺量的生物质油掺入沥青中,借助分子动力学技术及宏观试验研究了生物质油对沥青微观技术性能的影响及机理。引入内聚能密度和Hansen溶解度等微观评价指标,以动态模量-内聚能密度关系验证沥青模型的合理性,进而研究包括微观杨氏模量、微观泊松比、微观黏度和溶解度参数在内的微观性能。研究表明,基于甘油三酯(TG)平均分子结构获得的生物质油改性沥青分子模型具有良好的可靠性;在微观尺度下,沥青材料的内聚能密度越大,沥青中各分子之间的黏结也越牢固,宏观上表现出更强的抗剪切变形能力;而掺量逐步增大的生物质油会使沥青模型的杨氏模量和泊松比有所降低,在一定载荷下,生物质油的掺入会使沥青变得更加柔和,其在水平方向的变形也会更小;同样,沥青模型的黏度也会随着生物质油掺量的增加而有所降低。另外,计算了SBS改性剂、生物质油及沥青的Hansen溶解度参数,结果证实了SBS与沥青的储存稳定性差的微观机理在于两者的Hansen溶解度参数相差较大,同时,相比于SBS改性剂,生物质油的Hansen溶解度参数与沥青更为接近。从微观机理上可以推断,生物质油改性沥青的储存稳定性优于SBS改性沥青。本工作探明了生物质油对沥青微观性质的影响,进一步拓展了研究沥青材料的科学方法,为生物质油改性沥青在道路施工中的存储和应用提供了理论基础。
In order to further verify the feasibility of the application of bio-oil modified asphalt in asphalt pavement,this work mixed different amounts of bio-oil into the asphalt,and the impact and mechanism of the micro-technical performance of bio-oil on asphalt were studied by means of molecular dynamics technology and macro experiments.In this work,microscopic evaluation indicators such as cohesive energy density and Hansen solubility were introduced,the rationality of the asphalt model was verified by the relationship between dynamic modulus and cohesive energy density,and the microscopic properties including microscopic Young s modulus,microscopic Poisson s ratio,microscopic viscosity and solubility parameters were further studied.The results show that the molecular model of bio-oil modified asphalt based on the average molecular structure of triglyceride(TG)has good reliability;in micro scale,the greater the cohesive energy density of the asphalt binder,the stronger the bond between the molecules in the asphalt binder,and the better the ability to resist shear deformation macroscopically;the increasing bio-oil can reduce the Young s modulus and Poisson s ratio of the asphalt model;under a certain load,the incorporation of bio-oil can make the asphalt binder softer,and the horizontal deformation also gets smaller.Similarly,the shear modulus of the asphalt binder model decreases with the amount of bio-oil.In addition,the Hansen solubility parameters of SBS modifier,biomass oil and asphalt were calculated.It is confirmed that the microscopic reason for the poor storage stability of SBS modified asphalt binder is the difference of the Hansen solubility parameters between SBS and asphalt binder.Furthermore,it is found that the Hansen solubility parameter of bio-oil and asphalt binder is closer,compared with SBS.From the microscopic mechanism,it can be inferred that the storage stability of bio-oil modified asphalt binder is better than that of SBS-modified asphalt binder.The influence of biomass oil on the microscopic properties of asphalt has been proved,and the scientific method of studying asphalt materials has been further expanded.The storage and application of oil-modified asphalt in asphalt road construction provides a theoretical basis.
作者
屈鑫
丁鹤洋
王超
刘玉
汪海年
QU Xin;DING Heyang;WANG Chao;LIU Yu;WANG Hainian(College of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Center of Ecological Collaborative Innovation for Aluminum Industry in Guangxi,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Guangxi University,Nanning 530004,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2022年第19期120-125,共6页
Materials Reports
基金
国家自然科学基金(51878063,52078048,52008029)。
作者简介
屈鑫,现为长安大学公路学院讲师、道路与机场道面硕士研究生导师。2018年毕业于德国亚琛工业大学,获得工学博士学位。研究方向包括沥青性能表征和本构方程、沥青微观结构表征与模拟、沥青老化和改性机理、乳化沥青及其混合料技术性能和SBS改性沥青的再生技术等;汪海年,现为长安大学公路学院教授、博士研究生导师。2007年毕业于长安大学,获得工学博士学位。2010—2011年在密歇根理工大学作访问学者。研究方向包括特殊区域道路工程设计理论与方法、道路材料细观表征与建模、环保铺面材料研发与评价等,发表学术论文160余篇,其中以第一或通信作者发表SCI论文53篇,入选爱思唯尔中国高被引学者。wanghn@chd.edu.cn。
