基于加速加载试验的青川岩改沥青混合料疲劳性能研究  

Fatigue Performance of Qingchuan Rock Modified Asphalt Mixture under Accelerated Loading Test

作　　者：李志[1] 郝岩 袁晓曼 庄传仪[1] LI Zhi;HAO Yan;YUAN Xiaoman;ZHUANG Chuanyi(Shandong Jiaotong University,Jinan,Shandong 250357,China;Shandong Highway Testing Center,Jining,Shandong 272007,China)

机构地区：[1]山东交通学院,山东济南250357 [2]山东省公路检测中心,山东济宁272007

出　　处：《中外公路》2024年第3期78-84,共7页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:52078279);国家重点研发计划项目(编号:2018YFB1600100);山东省交通科技计划项目(编号:2016B41)。

摘　　要：为评价青川岩改沥青混合料疲劳性能,该文设计了基于比例尺为1∶3的路面加速加载试验系统的动轮载三点弯曲加载疲劳试验装置,对双层沥青混合料复合车辙试件进行轮胎碾压下的三点弯曲重复加载疲劳试验,结合沥青混合料小梁试件MTS弯曲疲劳试验,评价青川岩改沥青及复合改性沥青等对沥青混合料疲劳性能的改善效果。结果表明:青川岩改沥青提高了沥青混合料承受重复弯拉荷载的能力,改善了沥青混合料的抗疲劳性能,其抗疲劳性能优于青川岩沥青与SBS复合改性沥青、SBS改性沥青和基质沥青;基于比例尺为1∶3的路面加速加载试验的动轮载三点弯曲重复加载疲劳试验,能更真实地模拟现场路面轮载作用,减少了小梁试件尺寸效应对疲劳寿命的影响,再现了轮载作用下路面结构的受力状况。To evaluate the fatigue performance of Qingchuan rock modified asphalt mixture,a dynamic wheelload three-point bending loading fatigue test device based on an accelerated loading test system of 1∶3 scale pavement was designed.The three-point bending repeated loading fatigue test of a composite rutting specimen of double-layer asphalt mixture under tire rolling was carried out.Through the MTS bending fatigue test of a small beam specimen of asphalt mixture,the improvement effects of Qingchuan rock modified asphalt and composite modified asphalt on the fatigue performance of the asphalt mixture were evaluated.The results show that Qingchuan rock modified asphalt can improve the ability of asphalt mixture to withstand repeated bending and tensile loads and enhance the fatigue resistance of asphalt mixture,and its fatigue resistance is better than that of Qingchuan rock asphalt,SBS composite modified asphalt,SBS modified asphalt,and base asphalt.The dynamic wheel-load three-point bending repeated loading fatigue test based on the accelerated loading test of 1∶3 scale pavement provides a more realistic simulation of the wheel load action in the field,reduces the effect of the size effect of the small beam specimen on the fatigue life,and reproduces the force condition of the pavement structure under the wheel load action.

关 键 词：道路工程 疲劳性能 青川岩改沥青 加速加载试验 双层沥青混合料复合试件 

分 类 号：U414[交通运输工程—道路与铁道工程]