摘要
为明确高黏剂对基质沥青的改性效果,以及各类再生剂组分对老化高黏沥青的再生效果,基于分子动力学模拟研究了SBS-SBR复配高黏剂与基质沥青的相容性、扩散状态与高黏沥青力学性能,以及3种代表性再生剂分子与老化SBS-SBR高黏沥青的相互扩散与混溶修复作用.结果表明,高黏剂掺量(质量分数)为12%时,4%SBS+8%SBR高黏剂向基质沥青的扩散状态最佳,且最有利于二者间交联结构形成;6%SBS+6%SBR高黏剂与基质沥青的相容性最佳,且高黏沥青体积模量最大;加入8%SBS+4%SBR的高黏沥青剪切模量最大.再生过程中,对二甲苯与老化高黏沥青的相互作用与渗透性最强,壬醛改善老化高黏沥青中沥青质自聚集的效果最好,正己烷分子更易出现在老化高黏沥青分子周围.SBS-SBR复配高黏剂的改性效果优于单一组分高黏剂,且多组分复配再生剂对老化高黏沥青的再生效果最好.
To clarify the modification effect of the high viscosity modifier on the matrix asphalt and the recycling effect of various rejuvenator components on the aged high viscosity asphalt,the compatibility,diffusion state between the styrene-butadiene-styrene block copolymer(SBS)-styrene-butadiene rubber(SBR)composite high viscosity modifiers and matrix asphalt,and the mechanical properties of high viscosity asphalt were studied through molecular dynamics simulation.The interdiffusion and miscibility repairing effects of three representative rejuvenator molecules on the aged SBS-SBR high-viscosity asphalt were studied.The results show that under the high viscosity content of 12%,when the composite ratio is 4%SBS+8%SBR,it is most favorable for the formation of the cross-linked structure between the high viscosity modifier and the matrix asphalt,and the diffusion state of the high viscosity modifier in the matrix asphalt are the best.When the composite ratio is 6%SBS+6%SBR,the compatibility of the high viscosity modifier with the matrix asphalt is the best,and the bulk modulus of the high viscosity asphalt is the largest.When the composite ratio is 8%SBS+4%SBR,the shear modulus of the high viscosity asphalt is the largest.During the recycling process,the interaction and the permeability between p-xylene and the aged high viscosity asphalt are the strongest.Nonanal is most beneficial to improving the self-aggregation of asphaltene in the aged high viscosity asphalt.N-hexane molecules are more likely to appear around the aged high viscosity asphalt molecules.The modification effect of SBS-SBR composite high viscosity modifier is better than that of the high viscosity modifier with only single component,and the multi-component composite rejuvenator has the best recycling effect on the aged high viscosity asphalt.
作者
朱雅婧
徐光霁
马涛
范剑伟
Zhu Yajing;Xu Guangji;Ma Tao;Fan Jianwei(School of Transportation,Southeast University,Nanjing 211189,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第4期736-743,共8页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51808116)
国家自然科学基金优秀青年科学基金资助项目(51922030)
江苏省自然科学基金资助项目(BK20180404)
江苏省研究生实践创新计划资助项目(1121002213)
东南大学优秀青年教师科学研究资助项目(2242021R41132).
关键词
分子动力学
SBS
SBR
高黏沥青
再生
molecular dynamics
styrene-butadiene-styrene(SBS)
styrene-butadiene rubber(SBR)
high viscosity asphalt
recycling
