| 摘要: |
| 针对以延度指标来评价硬质沥青低温性能的局限性，选取4种代表性的硬质沥青进行低温弯曲梁流变（BBR）试验，得到其蠕变劲度模量S、蠕变劲度变化速率m等参数.利用Burgers黏弹模型对低温蠕变柔量曲线进行拟合分析，构建了松弛时间λ、新指标m（t）/S（t）和低温综合柔量参数JC等沥青低温黏弹性评价指标，并与硬质沥青混合料的最大弯拉应力指标进行相关性分析.结果表明：采用单一的S或m指标评价硬质沥青的低温性能存在一定的片面性，兼顾模量、蠕变速率、松弛能力的λ、m（t）/S（t）、JC可以更加准确地反映和评价硬质沥青的低温流变性能；在进行研究时可以采用m（t）/S（t）指标来评价硬质沥青的低温流变特性，但在工程应用中宜采用λ指标作为硬质沥青的低温评价指标. |
| 关键词: 硬质沥青 低温性能 Burgers模型 评价指标 |
| DOI：10.3969/j.issn.1007-9629.2021.05.029 |
| 分类号:U416.4 |
| 基金项目:国家自然科学基金资助项目（51668038，51868042）；甘肃省杰出青年基金项目（1606RJDA318）；甘肃省高等学校产业支撑引导项目（2020C-13）；兰州市科技计划项目（2018-4-33） |
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| Evaluation on Low Temperature Characterization of Hard Petroleum Asphalt Base on the Burgers Model |
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LI Bo1, ZHANG Xijun1, LI Jianxin2, YANG Kehong3, TONG Peipei2
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1.National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control， Lanzhou Jiaotong University， Lanzhou 730070， China;2.PetroChina Fuel Oil Company Limited Research Institute， Beijing 100195， China;3.PetroChina Karamy Petrochemical Co.， Ltd.， Karamy 834003， China
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| Abstract: |
| Due to the limitation of ductility index in evaluating the low temperature performance of hard petroleum asphalt， a better evaluation index of low temperature performance of hard asphalt was proposed. Bending beam rheological （BBR） test of four kinds of representative hard petroleum asphalt were carried out at different temperatures. The low-temperature parameters such as stiffness modulus and creep stiffness change rate of each asphalt sample were tested. Burgers viscoelastic model was used to fit and analyze the low temperature creep compliance curve， and the low temperature viscoelastic evaluation index of asphalt was constructed， including relaxation time λ， new index m（t）/S（t）， low temperature comprehensive compliance parameter JC. At same time， the correlation analysis and comparison with the maximum bending tensile stress index of hard petroleum asphalt mixture were established. The results show that there are some limitations in using absolute index （S or m） to evaluate the low-temperature performance of hard petroleum asphalt. Considering the modulus， creep rate， λ， m（t）/S（t） and JC of hard petroleum asphalt modulus， creep rate and relaxation capacity can reflect and evaluate the low-temperature rheological properties of hard petroleum asphalt more accurately. It is suggested to use index m（t）/S（t） to evaluate the low-temperature rheological properties of hard petroleum asphalt during the research work， and λ should be used as the low-temperature evaluation index of hard petroleum asphalt in engineering application. |
| Key words: hard petroleum asphalt low temperature performance Burgers model evaluation indicator |
