沥青混合料的动态响应影响因素分析  

Analysis of Dynamic Response Influencing Factors for Asphalt Mixture

作　　者：栗培龙[1] 李建阁[1] 邹鹏[1] 珠力克 

机构地区：[1]长安大学道路结构与材料交通行业重点实验室,西安市710064

出　　处：《公路》2017年第5期1-7,共7页Highway

基　　金：交通运输部基础研究计划项目;项目编号2014319812151;陕西省自然科学基础研究计划项目;项目编号2014JQ7242;国家自然科学基金;项目编号51108037;中央高校基本科研业务费资助项目;项目编号310821162010

摘　　要：选择3种沥青混合料进行不同试验条件下的沥青混合料性能试验(AMPT),分析了加载频率及试验温度对沥青混合料黏弹性动态响应的影响;并采用Sigmoidal模型,得到了沥青混合料的动态模量移位因子及模型参数,形成并分析了沥青混合料动态模量和相位角主曲线。结果表明,随着加载频率的升高,沥青混合料的动态模量逐渐增大,但温度越高,增加幅度越小;动态模量随着加载频率增大,在较低的温度下(5℃和15℃)符合对数增长关系,在较高的温度下(45℃和55℃)符合线性增长关系,但超过45℃后,不同加载频率的动态模量差异较小。不同加载频率的相位角最大值对应的温度不同,加载频率越低,对应的温度也越低。动态模量主曲线和移位因子可以较好地描述加载频率和试验温度对沥青混合料黏弹性动态响应的影响。在低温高频状态下,矿料级配对沥青混合料动态模量的贡献较大;而在高温低频状态下,沥青逐渐软化,结合料对混合料动态模量的影响更为显著。The Asphalt Mixture Performance Tests （AMPT） are conducted on three types of asphalt mixtures under different test conditions, the effect of loading frequency and test temperature on the visco elastic dynamic response of asphalt mixtures are analyzed, and by means of Sigmoidal model, the shift factor of dynamic modulus and model parameters are obtained, the master curves of dynamic modulus and phase angle of asphalt mixture are obtained and analyzed. The results indicate that the dynamic modulus of asphalt mixtures goes up with increase of loading frequency, while the increasing amplitude is smaller at a higher temperature; the dynamic modulus increases with increase of loading frequency in accordance with the logarithmic growth relationship at low temperatures（5℃ and 15℃）and the linear growth relationship at higher temperatures（45℃ and 55℃）, while after higher than 45℃, the difference of dynamic moduli for different loading frequencies is smaller. The temperatures corresponding to the maximum phase angle under different frequencies are not the same, and it is lower under the smaller loading frequency. The dynamic modulus master curve and shift factor can reflect the effect of loading frequency and temperature on the visco-elastie dynamic response of asphalt mixture. The aggregate gradation has a large contribution to dynamic modulus of asphalt mixture under the condition of low temperature and high frequency, while under the condition of high temperature and low frequency, asphalt will soften and the binder has more significant influence on the dynamic modulus of asphalt mixture.

关 键 词：沥青混合料 黏弹性动态响应 动态模量 相位角 主曲线 

分 类 号：TU535[建筑科学—建筑技术科学]