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. |
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 |
DOI:10.3969/j.issn.1007 9629.2012.04.015 |
分类号: |
基金项目:“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) |
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Study on the Fatigue Characteristic of Porous Asphalt Concrete |
JIANG Wei1, SHA Ai min1, PEI Jian zhong1, CHEN Shi2, ZHOU Hao1
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1.Key Laboratory for Special Area Highway Engineering of Ministry of Education, Changan University, Xian 710064,China;2.First Highway Consultants Co., Ltd., China Communications Construction Company Ltd., Xian 710075, China
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Abstract: |
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 aggregate ratio increased. There exist an optimum asphalt aggregate ratio which provides a best fatigue characteristic. 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. |
Key words: road engineering porous asphalt concrete(PAC) fatigue characteristic air void(VV) asphalt aggregate ratio saturation condition |