摘要
以沥青路面层间剪切疲劳性能为研究对象,采用乳化沥青、改性乳化沥青和热沥青3种粘层材料,通过自行研制的剪切夹具对双层沥青混凝土(AC+AC)复合试件进行层间剪切疲劳试验,研究有无粘层油、粘层材料种类和层间污染对路面层间剪切疲劳性能的影响。通过试验分析,得出如下结论:喷洒粘层油会显著提高沥青路面层间的剪切疲劳寿命,层间污染会使路面层间疲劳寿命明显下降,剪切疲劳寿命对应力比变化十分敏感。若想减少沥青路面层间损坏,一方面应喷洒粘层油并减少层间污染,以加强面层层间的粘结,提高层间抗剪切性能,另一方面应严格限制超载车辆的通行,以降低层间剪应力水平。
This paper focused on investigating the shear fatigue performance between two asphalt concrete （AC） layers. Emulsified asphalt, modified emulsified asphalt and hot asphalt binder were used as tack coat materials in the laboratory experiment. A customised shear testing device was designed to evaluate the shear fatigue performance at the interface between cylindercompound sample layers （ AC ＋ AC）. We investigated the influence of several factors on the shear fatigue performance of the interface between pavement layers. These factors included the interface with and without tack coat, tack coat type and interface pollution. The test result shows that （ 1 ） the use of tack coat leads to significant increase in the shear fatigue performance, while interface pollution significantly decreases the fatigue life; （2） the shear fatigue life is very sensitive to the change of stress ratio; （3） to reduce the slippage failure between two asphalt concrete layers, tack-coat material should be spread and interface pollution must be reduced so that the bonding between layers could be improved to achieve higher shear strength. Meanwhile, over loading vehicles must be limited to reduce the shear stress at the interface.
出处
《公路交通科技》
CAS
CSCD
北大核心
2012年第10期11-15,共5页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51108375)
陕西省重点学科建设专项资金项目(E01004)
关键词
道路工程
沥青路面
粘层
剪切疲劳性能
层间状况
road engineering
asphalt pavement
tack coat
shear fatigue performance
interface condition
