离析对沥青混合料路用性能的影响  

Influence of Segregation on Asphalt Mixture Performance

作　　者：郑晓光[1] 徐健[1] 丛林[2] 郭忠印[2] 

机构地区：[1]上海市政工程设计研究总院,上海200092 [2]同济大学道路与交通工程教育部重点实验室,上海200092

出　　处：《公路交通科技》2008年第11期16-19,23,共5页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技资助项目(200431882053)

摘　　要：针对目前离析对沥青混合料路用性能影响大多数是定性的研究,没有全面定量的研究现状。将沥青混合料离析分为偏细、无、轻度和重度等4种水平。室内模拟了不同程度离析混合料级配、沥青用量与空隙率等关键指标的变异性,分别测定了不同程度的离析条件下沥青混合料高温稳定性、水稳定性和抗疲劳性能,定量分析离析水平下沥青混合料路用性能衰减程度,研究离析对沥青混合料路用性能的影响。试验结果表明,高温稳定性在偏细、重度离析时明显降低;相对于均匀沥青混合料,混合料变细使得沥青混合料水稳定性和抗疲劳性能略有提高;轻度离析、重度离析的水稳定性分别降低34%、51%;同样抗疲劳性能也分别降低30%-50%,50%-70%。The previous researches of influence of segregation on asphalt mixture performance were qualitative and not comprehensive. The segregation of asphalt mixture was divided into four levels in this research： fine, none, low, and high. A laboratory testing program was designed that used the data from two of the field projects to simulate segregated mixtures in the laboratory. Simulating the variability of asphalt mixture＇ s grade, asphalt binder content and air void in factual construction conditions, performance of asphalt mixture was tested to analyze the influence of segregation. The laboratory tests were carried out to estimate the influence of various levels of segregation on high temperature stability, water stability and anti-fatigue performance. The influence of segregation on mixture properties is achieved. The results indicate that （1） high temperature stability declines in fine and high segregation conditions markedly; （2） fine segregation induces a little increase of water stability and anti-cracking performance; （3） in low and high segregation conditions, water stability decreases 34% and 51% respectively, and anti-fatigue performance decreases 30% - 50% and 50% - 70% respectively.

关 键 词：道路工程 沥青混合料 性能试验 离析 

分 类 号：U414.75[交通运输工程—道路与铁道工程]