| 摘要: |
| 利用动态剪切流变仪（DSR）对不同沥青进行低温剪切松弛试验，获得剪切松弛模量，并求出蠕变柔量的解析解和Matlab解，进而反演得到劲度模量（Sshear）及其变化率（mshear）；另外利用弯曲梁流变仪（BBR）测得沥青劲度模量（S）及其变化率（m），对反演结果Sshear、mshear进行验证.结果表明：Matlab求解方法与解析解法虽直观表达形式不同，但结果大小相当；同种沥青的Sshear与S值存在稳定比例关系，比例系数约为4.5；不同沥青在60 s时的Sshear、mshear值与BBR实测结果呈正比关系，比例系数分别约为4.5和1.1；从Kendall秩相关系数来看，不同沥青反演结果与实测结果排序具有良好的一致性，故通过剪切松弛试验对沥青低温劲度模量进行反演是可行的. |
| 关键词: 劲度模量 剪切松弛试验 改性沥青 反演 |
| DOI：10.3969/j.issn.1007-9629.2022.03.011 |
| 分类号:U414.1 |
| 基金项目:国家重点研发计划项目（2019YFB1310603） |
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| Back Calculation Method of Asphalt Stiffness Modulus Based on Shear Relaxation Test |
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WANG Qin1, DU Zhenyu2,3,4, MAO Juliang1, XIAO Feipeng2,3, YUAN Jie2,3
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1.Shanghai Tongji Testing Technology Co., Ltd., Shanghai 200092, China;2.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China;3.The Key Laboratory of Infrastructure Durability and Operation Safety in Airfield of CAAC, Tongji University, Shanghai 201804, China;4.Airport College, Civil Aviation Flight University of China, Guanghan 618307, China
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| Abstract: |
| The dynamic shear rheometer（DSR） was used to carry out low-temperature shear relaxation tests on different asphalt binders， and the shear relaxation modulus were obtained. The analytical solution and Matlab solution of creep compliance were obtained， and then the stiffness modulus（Sshear） and modulus change rate（mshear） were back calculated. The bending beam rheometer（BBR） was used to measure the low temperature stiffness modulus（S） and modulus change rate（m） of different asphalt binders， and the back calculated results of Sshear and mshear were verified. The results show that the stiffness modulus calculated by Matlab is different from the intuitive expression of analytical solution， but the magnitude is almost the same. There is a stable proportional relationship between the Sshear of the same asphalt binders and the measured S value by BBR， and the proportional coefficient is about 4.5. The results show that there is a positive correlation between the measured results of BBR and the values of Sshear and mshear of different asphalt binders at 60 s， and the coefficients are about 4.5 and 1.1 respectively. From the Kendall rank correlation coefficient， the back calculated results of different asphalt binders are in good agreement with the measured results， so it is feasible to inverse the low temperature stiffness of asphalt through low temperature shear relaxation test. |
| Key words: stiffness modulus shear relaxation test modified asphalt back calculation |
