沥青混合料疲劳耐久极限研究  

Research on the Fatigue Endurance Limit of Hot-mix Asphalt Concrete

作　　者：徐鸥明[1] 韩森[2] 高世君 

机构地区：[1]长安大学材料科学与工程学院,西安710061 [2]长安大学特殊地区公路工程教育部重点实验室,西安710064 [3]陕蒙高速公路建设管理处,榆林719000

出　　处：《武汉理工大学学报》2010年第8期45-47,116,共4页Journal of Wuhan University of Technology

基　　金：陕西省交通科技项目(05-05K)

摘　　要：为了评价沥青混合料是否存在疲劳耐久极限,通过控制应变的小梁疲劳试验,研究了沥青混合料疲劳性能随应变水平的变化情况。结果表明:当应变水平较高时,沥青混合料劲度模量随荷载作用次数的增大而急剧减小;随着应变水平的减小,劲度模量的减小趋势逐渐变缓;当应变水平低于200με时,疲劳寿命以非线性增加;当应变水平进一步降为100με和70με时,疲劳寿命曲线呈典型的渐近线特征,这表明沥青混合料确实存在某一疲劳耐久极限,当作用的应变水平低于该极限应变时,沥青混合料倾向具有无穷的寿命。In order to evaluate the behavior of asphalt mixture fatigue endurance limit,the changes of fatigue performance for hot-mix asphalt concrete with the strain are studied by beam fatigue test of controlling the response of strain. The results show that the asphalt mixture stiffness modulus reduces quickly with a sharp increase of load number.And the stiffness modulus tends to reduce slowly with debasing the strain.When the strain falls to 200 με below,the fatigue life will increase sharply in a non-linear form.And further reduced to 100 με and 70 με,fatigue life curve exhibits a typical feature of asymptote.The trend indicates that asphalt mixture has a fatigue endurance limit.When the strain below the limit strain,the asphalt mixture shall have a tendency of infinite life.

关 键 词：道路工程 沥青混合料 疲劳极限 极限应变 

分 类 号：U416.21[交通运输工程—道路与铁道工程]