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老化沥青混合料疲劳特性表征新方法

发表时间:2013-06-30  浏览量:1034  下载量:489
全部作者: 吕松涛,陈杰
作者单位: 长沙理工大学交通运输工程学院,公路工程省部共建教育部重点实验室(长沙)
摘 要: 为表征老化沥青混合料的疲劳特性,通过对沥青混合料进行不同程度的老化试验模拟路面实际的老化程度。通过不同加载速率下的沥青混合料强度试验,揭示了强度随加载速率的变化规律。基于不同加载速率下的强度值,得到了与疲劳加载速率对应的疲劳真实应力比,建立了基于名义应力比和真实应力比的沥青混合料疲劳方程,基于真实应力比的疲劳方程可以后延到疲劳寿命为1的强度破坏点,统一了强度破坏与疲劳破坏的内在联系;建立了基于真实应力比的老化沥青混合料疲劳方程,疲劳方程曲线均通过(1,1)点。
关 键 词: 道路工程;沥青路面;疲劳;老化;应力比
Title: New methods for characterizing fatigue properties of aging asphalt mixture
Author: LV Songtao, CHEN Jie
Organization: Key Laboratory of Highway Engineering (Changsha), Ministry of Education, School of Communication and Transportation Engineering, Changsha University of Science & Technology
Abstract: In order to characterize the fatigue properties of aging asphalt mixture, the actual aging degree of asphalt pavement was simulated by the different oven aging tests. The rule between strength and loading rate through strength tests under different loading rates was revealed. Based on the strength values under different loading rates, the asphalt mixture real stress ratios corresponding to the fatigue loading rates were obtained. The asphalt mixture fatigue equations were created based on nominal and real stress ratio through fatigue tests. The fatigue equation characterized by real stress ratio could be extended to the strength failure point, which the fatigue life was 1. Furthermore, the inner relationship between the strength and fatigue failure were unified. The fatigue equation of asphalt mixtures at different aging degree were established based on real stress ratio, and all the fatigue curves passed through the point of (1,1).
Key words: road engineering; asphalt pavement; fatigue; aging; stress ratio
发表期数: 2013年6月第12期
引用格式: 吕松涛,陈杰. 老化沥青混合料疲劳特性表征新方法[J]. 中国科技论文在线精品论文,2013,6(12):1148-1154.
 
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