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沥青胶结料低温物理硬化及结晶动力学分析
Physical Hardening Test and Crystallization Kinetics Analysis of Pavement Asphalt Binder
投稿时间:2017-09-23  修订日期:2017-11-30
DOI:103969/j.issn.1007 9629201804026
中文关键词:  沥青胶结料  物理硬化  改进弯曲梁流变试验  结晶动力学
英文关键词:pavement asphalt  physical hardening  extended bending beam rheometer(EBBR) test  crystallization kinetics
基金项目:长沙理工大学道路结构与材料交通行业重点实验室开放基金项目(kfj150301);国家留学基金委公派留学基金项目(201508430004);湖南省自然科学基金面上项目(2018JJ2126)
           
作者单位
聂忆华
NIE Yihua
湖南科技大学土木工程学院,湖南湘潭411201
School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
孙世恒
SUN Shiheng
湖南科技大学土木工程学院,湖南湘潭411201
School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
丁海波
DING Haibo
女王大学化学学院,安大略金士顿K7L3N6
Department of Chemistry, Queens University, Kingston K7L3N6, Canada
HESPAdrianusMariaSimon
HESP Adrianus Maria Simon
女王大学化学学院,安大略金士顿K7L3N6
Department of Chemistry, Queens University, Kingston K7L3N6, Canada
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中文摘要:
      为了准确模拟沥青胶结料的物理硬化过程及评估其物理硬化趋势,采用常规弯曲梁流变(BBR)试验设备对10种常用道路沥青进行了改进弯曲梁流变(EBBR)试验,并根据试验结果计算了低温等级损失指标;此外,在设计不同的低温恒温养护时间的基础上,测试了沥青蠕变劲度与蠕变劲度变化率,并采用Avrami等温结晶动力学理论对试验结果进行了拟合分析.结果表明:EBBR法较BBR法对沥青的低温性能区分精度更高;采用Avrami等温结晶动力学理论可较好地模拟沥青胶结料的物理硬化过程,拟合分析得到的Avrami指数与EBBR试验得到的低温等级损失值变化规律具有一致性;沥青胶结料低温物理硬化与结晶性能为评价沥青在实际工程中的低温抗开裂能力提供了更准确的信息.
英文摘要:
      Low temperature cracking and damage of asphalt pavement is very common, the asphalt bending beam rheometer(BBR) test proposed by SHRP to evaluate the phenomenon of low temperature cracking is still widely used. In order to better evaluate the asphalt physical hardening of one of the main factors of early cracking of asphalt pavement, extended bending beam rheometer(EBBR) test was used to evaluate ten kinds of commonly used road asphalt, and the low temperature grade loss index was calculated from the test results. Asphalt creep stiffness and creep rate at different low temperature conditioning period were measured, and Avrami isothermal crystallization dynamics theory was used to do fitting analysis, so the asphalt binder physical hardening mechanism can be studied. The results show that the EBBR method is more accurate than the BBR method for evaluating the low temperature performance of the asphalt, and the changes of Avrami index obtained by the fitting analysis of isothermal crystallization data can distinguish the low temperature physical hardening of the different asphalt from the same low temperature grade loss value obtained by the EBBR test, and the performance of asphalt physical hardening and crystallization can provide more accurate information about the anti cracking ability of pavement asphalt.
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