| 摘要: |
| 采用不同受力模式对3种沥青混合料进行动态模量试验，分析了受力模式、围压、应变水平等因素对沥青混合料动态模量主曲线的影响，通过Fillers Moonan Tschoegl模型和改进Sigmoidal模型建立了沥青混合料移位因子围压和动态模量围压之间的函数关系式.结果表明：二次拟合可以消除沥青混合料动态模量主曲线上动态模量极值对移位因子计算模式的依赖；在相同换算频率时，沥青混合料单轴压缩、间接拉伸和四点弯曲动态模量有差别，在低温高频段更明显，但三者之间存在较好的线性关系；在高温低频段，围压对沥青混合料三轴压缩动态模量的影响较显著；沥青混合料四点弯曲动态模量对应变水平变化较为敏感. |
| 关键词: 道路工程 沥青混合料 动态模量 主曲线 围压 应变水平 |
| DOI：103969/jissn1007 9629201405011 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51308303)；江苏省基础研究计划(自然科学基金)资助项目(BK20130980)；高等学校博士学科点专项科研基金资助课题(20123204120011)；住房和城乡建设部科学技术计划项目(2013 K4 9) |
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| Effects of Loading Modes on Dynamic Moduli of Asphalt Mixtures |
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LI Qiang, LI Guofen, WANG Hongchang
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School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China
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| Abstract: |
| Dynamic modulus tests were conducted on three asphalt mixtures under different loading modes. The effects of loading mode, confining pressure and strain level on the master curve of dynamic modulus were studied. The functions of shift factor confining pressure and dynamic modulus confining pressure for asphalt mixtures were developed using Fillers Moonan Tschoegl model and improved Sigmoidal model, respectively. It is found that twice fitting can eliminate the dependency of dynamic modulus extreme in the master curve on shift factor model. The uniaxial compressive, indirect tensile and four point bending dynamic modulus values of asphalt mixtures are different at the same reduced frequency, especially at low temperatures or high loading frequencies.However, there are nice linear correlations between them. The confining pressure has significant effect on triaxial compressive dynamic modulus at high temperatures or low loading frequencies. The four point bending dynamic modulus is sensitive to the change of strain level. |
| Key words: pavement engineering asphalt mixture dynamic modulus master curve confining pressure strain level |
