沥青混合料松弛时间谱分析  

Analysis of Relaxation Time Spectra of Asphalt Mixtures

作　　者：赵延庆[1] 王国忠[1] 王志超[1] 

机构地区：[1]大连理工大学交通运输学院,辽宁大连116024

出　　处：《建筑材料学报》2010年第5期636-640,共5页Journal of Building Materials

基　　金：交通部西部交通科技建设项目(200831800099)

摘　　要：根据改性沥青SMA13、改性沥青Superpave20和普通沥青Superpave25不同温度和荷载频率下的复数模量试验结果,采用多项对数正态分布组合形式确定了各沥青混合料的松弛时间谱函数,并利用遗传算法求解其中参数.结果表明:随着温度的降低和荷载频率的增加,沥青混合料存储模量增加;在中等及较高温度时,随着荷载频率的增加,沥青混合料损失模量增加,而当温度较低时,则正好相反;当采用2项或2项以上的对数正态分布组合时,利用松弛时间谱预测的存储模量和松弛模量具有较高的精度.利用松弛时间谱和时间-温度等效原理可以确定沥青混合料很宽作用时间范围上的黏弹参数,从而为沥青混合料及路面结构黏弹性力学响应分析提供简单、有效的途径.The relaxation time spectra of three asphalt mixtures, SMA13 with modified binder, Superpave20 with modified binder, and Superpave25 with neat binder, were determined using complex modulus test at various temperatures and loading frequencies. A combination of multiple lognormal distributions was used to represent the relaxation time spectrum function and the parameters were determined using genetic algorithm. The results show that the storage modulus of asphalt mixture increases with increasing loading frequency and decreasing temperature. At intermediate and high temperatures, the loss modulus of asphalt mixture increases as loading frequency increases, while at low temperature the situation is opposite. Accurate storage modulus and loss modulus can be predicted from relaxation time spectrum when a combination of 2 or more lognormal distributions are used. Viscoelastic parameters of asphalt mixture defined at wide loading time ranges can be determined using relaxation time spectra and time-temperature superposition principle, which provides a simple and effective way for analyzing viscoelastic responses of asphalt mixture and pavement structure.

关 键 词：黏弹性 松弛时间谱 复数模量 遗传算法 对数正态分布 

分 类 号：U414[交通运输工程—道路与铁道工程]