基于分子动力学的ME改性沥青黏聚、黏附特性研究

Research on the Cohesion and Adhesion Characteristics of ME Modified Asphalt Based on Molecular Dynamics

我国南方地区夏天高温多雨,沥青路面易受到降雨、高温耦合作用,沥青黏聚、黏附性能削弱,路面水损加剧,针对此问题,采用分子动力学模拟并结合宏观拉拔试验,深入分析沥青内部黏聚和沥青-集料界面黏附作用机理,及水温耦合作用对沥青内部黏聚和沥青-集料界面黏附性能的影响。结果表明:基质沥青黏聚性能受水温耦合作用影响较小,受温度影响较大;基质沥青-集料黏附性能经水温耦合作用下降37%,受温度影响较小;当加入ME改性剂后,相较于基质沥青,ME改性沥青黏聚性能提升近5倍,与集料黏附性能提升103.9%,且ME改性沥青黏聚、黏附特性基本不受温度、水和水温耦合作用影响,可保持极高稳定性。

In southern China high temperature and rainy summer,because of vulnerable to rainfall,high temperature coupling effect of asphalt pavement,asphalt cohesion and adhesion performance were weakened,and road surface water was damaged.Aiming at this problem,the molecular dynamics simulation and macro drawing test were taken to analyse deeply the internal cohesion and tar-aggregate interface adhesion mechanism,and the effect of water temperature coupling on asphalt internal cohesion and asphalt-aggregate interface adhesion.The results show that the viscosity of asphalt is less affected by the coupling effect of water temperature but more affected by temperatureis The adhesion of bitumen to aggregates which is slightly affected by temperature.decreased by 37% due to the coupling effect of water temperature,When ME modifier is added,compared with the matrix asphalt,the cohesion property of ME modified asphalt is increased by nearly 5 times,and the adhesion property of ME modified asphalt is increased by 103.9%.Moreover,the cohesion and adhesion properties of ME modified asphalt are basically not affected by the coupling effect of temperature,water and water temperature,and can maintain a high stability.