沥青混合料黏弹性响应影响因素分析  

Analysis of Visco-elastic Response Influencing Factors of Asphalt Mixture

作　　者：栗培龙[1] 张争奇[1] 王秉纲[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《郑州大学学报（工学版）》2010年第3期96-100,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：西部交通建设科技资助项目(2006-318-812-21)

摘　　要：选择3种级配的沥青混合料进行不同温度和应力水平的蠕变试验,根据应力应变关系得到的蠕变柔量曲线获取Burgers黏弹性模型参数,分析温度、应力水平、矿料级配以及老化作用对沥青混合料黏弹性的影响.结果表明,随着温度的升高,3种沥青混合料的E1、η1、E2、η24个参数总体不断降低,即沥青混合料软化、模量减小,但不同温度下3种混合料的黏弹性参数排序并不相同;应力水平对沥青混合料的黏弹性能有显著影响,处于中间荷载水平0.5 MPa时4个黏弹性参数的区分度最大,但不同级配的沥青混合料对应力水平的响应存在差异,公称最大粒径相近的混合料的某些黏弹性参数变化趋势较一致;老化是沥青混合料黏弹性变化的重要原因,但短期老化和长期老化的影响并不相同.Three kinds of asphalt mixture were put to static creep test under different temperatures and stress levels.According to creep compliance curves from the stress-strain relations,Burgers visco-elastic model parameters were got to analyze influences on visco-elastic response of temperature,stress level,aggregate gradation,as well as aging effect for asphalt mixture.The results and analysis indicated that four parameters（E1,η1,E2,η2） continuously reduce with the increasing of the temperature,which shows that asphalt is softening and modulus decrease.But visco-elastic parameters sequence of the three asphalt mixtures were not the same under different temperatures.Stress levels have a significant effect on visco-elastic response and four visco-elastic parameters have the greatest degree of distinction at the level of 0.5MPa load.Howsever,responses on stress level for different gradation mixture were different.Aging is an important reason introducing viscoelasticity changes of asphalt mixture.But short-term aging and long-term aging have different effects.

关 键 词：沥青混合料 黏弹性响应 影响因素 老化 

分 类 号：U414.75[交通运输工程—道路与铁道工程]