再生沥青混凝土疲劳特性及影响因素分析  

Study on Fatigue Characteristics of RAP Asphalt Mixture Considering Temperature and Loading Frequency

作　　者：邓旭华[1] 王智超[1] Deng Xuhua;Wang Zhichao(School of Civil Engineering,Xiangtan University,Xiangtan,Hunan 411105)

机构地区：[1]湘潭大学土木工程学院,湖南湘潭411105

出　　处：《江西建材》2022年第8期28-29,32,共3页Jiangxi Building Materials

基　　金：湖南省教育厅优秀青年项目(17B260);湖湘高层次人才聚集工程-创新团队(2019RS1059)。

摘　　要：文中采用IDT试验,研究了热再生沥青混合料疲劳寿命的影响规律,对混合料在温度和加载频率下的应力水平-对数疲劳寿命进行了拟合。结果表明,再生沥青混合料(RAP)掺量的增加会降低混合料的疲劳寿命,掺量大于30%时降幅明显,且掺量越高混合料疲劳寿命对荷载水平变化越敏感,会随加载频率的增加而增加;在低应力水平下,加载频率不同造成混合料疲劳寿命差异更大;同时,在应力控制的加载模式,同一应力比条件下的混合料疲劳寿命随温度降低而急剧增长。The fatigue of the hot reclaimed asphalt mixture was analyzed by the indirect tensile fatigue test method(IDT). The stress levellog fatigue life of the recycled asphalt mixture was fitted at different temperatures and loading frequencies. The results showed that the fatigue life of recycled asphalt mixture decreases continuously with the increase of RAP content. When the RAP content was more than 30%, the reduction is especially obvious. The higher the RAP content, the more sensitive the fatigue life of the specimen was to the change of load level. The fatigue life of recycled asphalt mixture increased with the increase of loading frequency. At low stress level, the difference of loading frequency caused the greater difference of fatigue life. Meanwhile, in the stress-controlled loading mode, the fatigue life of the material increased sharply with decreasing temperature.

关 键 词：RAP IDT 加载频率 温度 对数疲劳寿命 

分 类 号：U414[交通运输工程—道路与铁道工程]