透水沥青混合料动态模量影响因素分析  

Analysis of Influencing Factors on Dynamic Modulus of Porous Asphalt

作　　者：周志刚[1] 周扬[1] 刘智仁 ZHOU Zhigang;ZHOU Yang;LIU Zhiren(Key Laboratory of Road Structure and Materials,Transportation Industry,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学道路结构与材料交通行业重点实验室,长沙410114

出　　处：《材料导报》2022年第13期117-123,共7页Materials Reports

基　　金：国家自然科学基金(51878079);湖南省交通科技计划项目(201807)。

摘　　要：为了给透水沥青路面结构分析、设计和养护提供依据,便于其工程推广应用,利用简单性能试验仪(SPT)开展透水沥青混合料(PA)动态模量的三轴压缩试验,研究空隙率、围压、加载频率、温度等因素对动态模量和相位角的影响规律,并对各因素进行灰色关联度分析。研究结果表明:空隙率对动态模量和相位角的综合影响最大,围压对两者的影响相对较小,而加载频率、温度分别主要影响动态模量、相位角。透水沥青混合料动态模量具有明显的热流变特性、频率特性和应力依赖性。动态模量随空隙率增大或温度升高而减小,随围压或加载频率增大而增大。动态模量在低温时的频率特性和高温时的应力依赖性均较强。相位角反映出不同条件下,透水沥青混合料黏弹性特征变化规律不同。随着温度的逐渐升高,黏性特征逐渐明显,在高频(低频)下,当温度升至25 ℃(40 ℃)之后,黏性特征又逐渐减弱。围压的增大会增强透水沥青混合料的弹性特征,而空隙率的增大会使其黏性特征明显。低温时,随着加载频率的增大,透水沥青混合料的黏性滞后特征减弱,高温时则相反。The triaxial compression test of dynamic modulus of porous asphalt (PA) was carried out by using simple performance tester (SPT) to study the influence of air voids, confining pressure, loading frequency and temperature on dynamic modulus and phase angle in order to provide the basis for the structural analysis, design and maintenance of porous asphalt pavement, so as to promote its engineering application. Meanwhile, the grey correlation analysis was performed concurrently. The results show that the air voids has the greatest influence on the dynamic modulus and phase angle, while the confining pressure has relatively slight influence on them, and that the loading frequency and temperature mainly affect the dynamic modulus and phase angle respectively. The dynamic modulus of porous asphalt has obvious thermal and rheological properties, frequency characteristics and stress dependence. The dynamic modulus decreases with increasing void fraction or temperature and increases with increasing surrounding pressure or loading frequency. The dynamic modulus has strong frequency characteristics at low temperatures and stress dependence at high temperatures. The phase angle reflects that the viscoelastic characteristics of porous asphalt change differently under different conditions. With the increase of temperature, the viscosity characteristics become more obvious. When the temperature rises to 25 ℃(40 ℃) respectively at high frequency (low frequency), the viscosity characteristics gradually weaken. The increase of confining pressure will enhance the elastic characteristics of porous asphalt, while the increase of air voids can make the viscosity characteristics obvious. At low temperature, the viscosity hysteresis characteristics of porous asphalt abates with the increase of loading frequency, but it is opposite at high temperature.

关 键 词：透水沥青混合料 动态模量 相位角 三轴压缩试验 影响因素 灰色关联度 

分 类 号：U414[交通运输工程—道路与铁道工程]