| 摘要: |
| 对4种改性沥青和1种基质沥青进行高温条件下较宽应力范围的重复蠕变试验，计算不同温度和应力水平下的不可恢复蠕变柔量Junr，分析改性沥青黏弹响应从线性到非线性的变化规律，再选择夏季沥青路面典型高温下沥青非线性响应区域内的Junr值，与沥青混合料车辙试验结果进行相关性分析.结果表明：随着温度升高，沥青的线性范围明显减小；进入非线性响应区域后，Junr值迅速增大，沥青抗永久变形能力明显降低；改性沥青的高温性能在不同温度和应力水平下存在差异，在较高温度和应力下，高强改性沥青的高温性能最优；有限样本条件下，沥青在非线性响应区域内的Junr值与沥青混合料车辙试验结果相关性较好，说明沥青混合料永久变形与沥青非线性黏弹响应关系密切. |
| 关键词: 道路工程 改性沥青 重复蠕变 黏弹性 非线性响应 高温性能 |
| DOI：10.3969/j.issn.1007 9629.2013.05.030 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目（51178113） |
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| Analysis of Nonlinear Viscoelastic Response of Modified AsphaltBased on Repeated Creep |
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GUO Yong mei, NI Fu jian
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School of Transportation, Southeast University, Nanjing 210096, China
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| Abstract: |
| Four kinds of modified asphalts and one kind of base asphalt were selected to conduct repeated creep tests over a wider stress range at high temperatures. Non recoverable compliance Junr was computed at different temperatures and stress levels to analyze the change rule from linear to nonlinear viscoelastic responses of modified asphalts, and then the Junr values within the nonlinear response regions of asphalt binders at a typical high temperature of asphalt pavement in summer were chosen to make a correlation analysis with the results from rutting tests of asphalt mixtures. The results show that the linear region of asphalt binders significantly becomes narrow with the rise of temperatures, and the Junr values begin to dramatically increase after entering the nonlinear response regions, demonstrating that their resistance to permanent deformation markedly reduces. The high temperature properties of modified asphalts at different temperatures and stress levels are diverse, and the high temperature property of high strength modified asphalt is the best at higher temperature and stress level. Under limited sample situations, the Junr values of asphalt binders in the nonlinear response regions have good correlation with the results from rutting tests of asphalt mixtures, and it indicates that permanent deformation of asphalt mixtures is in close relation with nonlinear viscoelastic responses of asphalt binders. |
| Key words: road engineering modified asphalt repeated creep viscoelasticity nonlinear response high temperature property |
