基于疲劳及线收缩的沥青混合料低温性能研究  

Investigation of the Low-temperature Performance of Asphalt Mixtures via Fatigue and Linear Contraction Test

作　　者：吴少鹏[1] 刘聪慧[1] 曹庭维[1] 庞凌[1] 

机构地区：[1]武汉理工大学硅酸盐工程材料教育部重点实验室,湖北武汉430070

出　　处：《华中科技大学学报（城市科学版）》2008年第4期30-32,39,共4页Journal of Huazhong University of Science and Technology

基　　金：交通部西部交通建设科技项目(200631800076)

摘　　要：沥青混凝土的低温开裂是沥青路面损害的三种主要方式(低温开裂、疲劳、车辙)之一。本文针对高寒地区沥青路面低温开裂现象,选取两种沥青和AC-13、SMA-13、PA-13等三种不同级配混合料进行四点弯曲疲劳、线收缩试验,研究了不同材料及级配对低温下沥青混合料的疲劳性能及收缩性能的影响。试验结果表明:级配及沥青种类对疲劳寿命影响较大且相对于常温时,低温下沥青混凝土的疲劳寿命较大,但对于加载应力的变化有较高的敏感性,表明低温时沥青混凝土疲劳性能的稳定性较差。不同类型沥青混凝土的线收缩系数有较大差别,其中AC-13级配及改性沥青混凝土表现出较好的收缩性,同时随着温度的降低,沥青混凝土线收缩系数变化趋势减缓。Low temperature cracking is one of the three major distresses （low temperature cracking, fatigue and rutting） in asphalt pavement. Two types of asphalt mixtures with different gradations （AC-13, SMA-13, PA-13） are chosen to study fatigue behavior and linear contraction of asphalt mixture at low temperature in this study. The fatigue life and linear contractive quotiety are investigated using UTM-25 under four-point bending fatigue test and linear contraction test. Experimental results show that gradation has an obvious effect on the fatigue life and asphalt mixture in low temperature exhibits larger fatigue life compared with that of asphalt mixture in high temperature. The linear contractive quotiety shows great distinction with the varieties of asphalt mixture gradation and temperature span. With the falling of temperature, the linear contractive quotiety decrease and the distinctions between different temperature spans tend to slower.

关 键 词：沥青混凝土 疲劳 线收缩 低温 

分 类 号：TU528.42[建筑科学—建筑技术科学]