多孔沥青混合料的疲劳特性试验研究  

Study on the Fatigue Characteristic of Porous Asphalt Concrete

作　　者：蒋玮[1] 沙爱民[1] 裴建中[1] 陈实[2] 周浩[1] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064 [2]中国交通建设股份有限公司第一公路勘察设计研究院有限公司,陕西西安710075

出　　处：《建筑材料学报》2012年第4期513-517,543,共6页Journal of Building Materials

基　　金："十一五"国家科技支撑计划项目(2006BAJ18B05);中国博士后科学基金资助项目(2012M511964);教育部创新团队发展计划(IRT1050);中央高校基本科研业务费专项资金项目(CHD2011JC152)

摘　　要：采用应力控制模式对不同材料组成的多孔沥青混合料进行疲劳试验,分析了空隙率、油石比和浸水状态对混合料疲劳特性的影响,并比较了不同油石比的沥青混合料在不同浸水时间下的疲劳特性差异.结果表明:多孔沥青混合料的抗疲劳性能随空隙率的增大而减小;随着油石比的增大,多孔沥青混合料疲劳寿命的应力敏感性降低,存在着最佳油石比,在最佳油石比下混合料的抗疲劳性能最好;浸水状态对多孔沥青混合料的疲劳特性影响与油石比大小密切相关,当油石比适中或偏大时,浸水3～10d对其疲劳特性影响较小.Porous asphalt concrete with different material composition were studied by the fatigue test of stress-control model, effect of air voids, asphalt-aggregate ratio and saturation condition on the fatigue characteristic were investigated. The fatigue characteristics of porous asphalt concrete with different asphalt-aggregate ratio and saturation time were compared by saturation fatigue tests. The results of the study show that the anti-fatigue performance of porous asphalt concrete is decreased with the increase of the air voids; and the stress sensitivity of porous asphalt concrete was decreased as the value of asphalt-ag- gregate ratio increased. There exist an optimum asphalt-aggregate ratio which provides a best fatigue char acteristic. Effects of saturation condition on the fatigue characteristic of porous asphalt concrete were closely related to the value of asphalt-aggregate ratio, there will be only little influence when the value of asphalt-aggregate ratio is moderate or larger.

关 键 词：道路工程 多孔沥青混合料 疲劳特性 空隙率 油石比 浸水状态 

分 类 号：U414[交通运输工程—道路与铁道工程]