| 摘要: |
| 采用动态剪切流变仪的应力扫描模式进行广义剪切试验,使用BoxLucas模型对试验数据进行拟合,得到了沥青的高温性能评价指标——剪切应力常量τ0,破坏应变γ0和广义剪切模量Gd.数据拟合时,应保证加载终了值对应的应变大于12%,否则可能导致Gd误差较大.通过对比分析5种沥青的高温性能,发现指标τ0和γ0不够客观,建议采用指标Gd. |
| 关键词: 广义剪切试验 广义剪切模量 剪切应力常量 破坏应变 |
| DOI：103969/j.issn.1007 9629201904021 |
| 分类号: |
| 基金项目:同济大学第十三期实验教改项目（1600104131）;中央高校基本科研业务费学科交叉类项目（1100219154） |
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| High Temperature Performance Evaluation Parameter of Asphalt Based on Generalized Shear Test |
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SUN Yanna1, ZHANG Zhongping2, LI Lihan1
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1.Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 201804, China;2.Zhejiang Communications Investment Group Co.,Ltd., Hangzhou 310020, China
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| Abstract: |
| The generalized shear test was performed using the dynamic shear rheometer under the stress sweep mode. When using the BoxLucas model to fit the test data, the evaluation parameter of asphalt high temperature performance including shear stress constant τ0, failure strain γ0 and generalized shear modulus Gd were developed. During data fitting, it is necessary that the strain corresponding to the end value of the stress loading is greater than 12%. If the strain corresponding to the end value of the stress loading is less than 12%, it may cause a large error on Gd. By comparing the performance of 5 kinds of asphalt, it is found that shear stress constant τ0 and failure strain γ0 are not accurate enough, it is recommended to use generalized shear modulus Gd to evaluate the high temperature performance of asphalt. |
| Key words: generalized shear test generalized shear modulus shear stress constant failure strain |
