基于动力学理论的沥青疲劳损伤过程表征研究  

Characterization of Fatigue Damage Process for Asphalt Based on Kinetics Theory

作　　者：房辰泽 郭乃胜 李辉[5] 褚召阳 刘涛 FANG Chen-ze;GUO Nai-sheng;LI Hui;CHU Zhao-yang;LIU Tao(Department of Transportation Engineering,Dalian Maritime University,Dalian 116026,Liaoning,China;School of Civil Engineering and Transportation,North China University of Water Resources and Electric Power,Zhengzhou 450045,Henan,China;Henan Province Engineering Technology Research Center of Environment Friendly and High-performance Pavement Materials,Zhengzhou 450045,Henan,China;Technology Innovation Center of Henan Transport Industry of Utilization of Solid Waste Resources in Traffic Engineering(North China University of Water Resources and Electric Power),Zhengzhou 450045,Henan,China;Department of Transportation,Southeast University,Nanjing 211189,Jiangsu,China)

机构地区：[1]大连海事大学交通运输工程学院,辽宁大连116026 [2]华北水利水电大学土木与交通学院,河南郑州450045 [3]河南省环境友好型高性能路面材料工程技术研究中心,河南郑州450045 [4]交通工程固废资源利用河南省交通运输行业技术创新中心(华北水利水电大学),河南郑州450045 [5]东南大学交通学院,江苏南京211189

出　　处：《中国公路学报》2025年第3期241-249,共9页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51308084);辽宁省自然科学基金项目(2018010659-301)。

摘　　要：沥青的疲劳损伤过程是复杂的变速率物理反应过程,为了能够准确地表征沥青疲劳损伤过程,选用基质沥青和SBS改性沥青,开展了不同温度下的应力控制疲劳试验,采用耗散伪应变能剔除了黏弹性耗散能对疲劳损伤的干扰,并应用耗散伪应变能表征了沥青的疲劳损伤,通过分析耗散能描述的损伤演化方程,确定了沥青疲劳损伤的代表性速率,并借助Arrhenius动力学方程关联了不同温度下沥青的疲劳损伤代表性速率,确定了沥青的疲劳损伤活化能。研究结果表明:耗散伪应变能可较为准确地表征沥青的疲劳损伤;损伤演化方程参数β可作为沥青疲劳损伤过程的代表性速率,用以量化沥青疲劳损伤过程的整体速率;沥青疲劳损伤活化能为疲劳损伤过程需要的最低能量,其表征了沥青发生疲劳损伤的难易程度,疲劳损伤活化能愈大,沥青愈不容易产生疲劳损伤;SBS改性沥青和基质沥青的疲劳损伤活化能分别为59.92、28.91kJ·mol^(-1),表明SBS改性剂形成的聚合物网格会增加疲劳损伤活化能,从而改善沥青的疲劳性能。综上可知,采用疲劳损伤代表性速率和疲劳损伤活化能2个动力学指标能够准确地表征沥青的疲劳损伤过程。The fatigue damage process of asphalt is a complex variable-rate physical reaction process.This study aimed to accurately characterize the fatigue damage process of asphalt.Controlled stress fatigue testswere conducted on SBS-modified asphalt and base asphalt at different temperatures.The dissipated pseudo strain energy was applied to eliminate the interference of viscoelastic dissipated energy on fatigue damage and characterize the asphalt fatigue damage.The representative rates of the fatigue damage processes were determined by analyzing the damage evolution equation described by dissipated energy.The Arrhenius kinetics equation was used to correlate the representative rates of asphalt fatigue damage at different temperatures for determining the fatigue damage activation energy of asphalt.The results show that dissipated pseudo strain energy can accurately characterize the asphalt fatigue damage.The damage evolution equation parameter,β,can be used as a representative rate indicator of the fatigue damage process of asphalt to quantify its overall rate of the fatigue damage process.The fatigue damage activation energy of asphalt is the minimum energy required for fatigue damage,which can characterize the degree of difficulty of the fatigue damage process.The higher the fatigue damage activation energy of asphalt,the lower the probability of fatigue damage occurring in asphalt.The fatigue damage activation energies of SBS-modified asphalt and base asphalt are 59.92 and 28.91 kJ·mol^(-1),respectively.The polymer network formed by SBS modifiers can increase the fatigue damage activation energy,thereby improving the fatigue performance of asphalt.In summary,the fatigue damage process of asphalt can be accurately characterized by the two indicators of the representative rate of fatigue damage and fatigue damage activation energy.

关 键 词：路面工程 沥青 疲劳损伤 动力学 代表性速率 活化能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]