RCA改性沥青改性机理与疲劳特性  

Modification mechanism and fatigue characteristics of RCA modified asphalt

作　　者：陆佳宝 王国忠[1] 胡江三 刘仲宁 LU Jiabao;WANG Guozhong;HU Jiangsan;LIU Zhongning(College of Energy and Transportation Engineering,Inner Mongolia Agricultural University,Huhhot 010018,China)

机构地区：[1]内蒙古农业大学能源与交通工程学院,呼和浩特010018

出　　处：《功能材料》2022年第12期12177-12183,共7页Journal of Functional Materials

基　　金：内蒙古自然科学基金项目(2019MS05033);内蒙古交通厅科技项目(NJ-2016-09)。

摘　　要：为了对高模量RCA改性沥青改性机理与疲劳特性进行深入研究,通过沥青3个基本性能指标、布洛克菲尔德黏度、红外光谱、线性振幅扫描和介电常数测试等试验方法对沥青的性能进行测定与分析。结果表明,RCA改性剂的最佳掺量为沥青质量的16.7%;RCA改性剂对沥青的改性为物理改性;在低应变下,RCA改性沥青的疲劳性能优于基质沥青,对应变的依赖性更高;提出的沥青新疲劳破坏准则计算出的疲劳寿命与沥青混合料疲劳寿命相关性良好,用其来评价RCA改性沥青的抗疲劳性能是可行的。In order to further study the modification mechanism and fatigue characteristics of high modulus RCA modified asphalt,its performance is measured by three indexes,Brockfield viscosity,infrared spectrum,linear amplitude scanning and dielectric constant test.The basic indexes,fatigue properties,functional group changes of asphalt and the changes of asphalt components based on dielectric properties with different modifier contents are discussed,and grey correlation degree between the components and asphalt pavement performance index is analyzed.The results show that the optimum content of RCA modifier is 16.7%of asphalt mass.The modification of asphalt by RCA modifier is physical modification.Under low strain,the fatigue performance of RCA modified asphalt is better than that of base asphalt,and the strain dependence is higher.The fatigue life calculated by the new asphalt fatigue failure criterion has a good correlation with the fatigue life of asphalt mixture,and it is feasible to evaluate the fatigue resistance of RCA modified asphalt.

关 键 词：道路工程 RCA改性沥青 抗疲劳性能 疲劳破坏准则 介电性质 

分 类 号：U414[交通运输工程—道路与铁道工程]