基于抗疲劳性能的ATB-25油石比设计  

Asphalt-aggregate ratio design of rubber asphalt ATB-25 based on fatigue performance

作　　者：田小革[1] 郭常辉 李光耀 胡宏立 卢雪蓉 TIAN Xiaoge;GUO Changhui;LI Guangyao;HU Hongli;LU Xuerong(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《交通科学与工程》2023年第6期48-56,共9页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(51978086)。

摘　　要：为确定符合抗疲劳性能要求的橡胶沥青ATB-25油石比范围,通过沥青常规试验和动态剪切流变试验(DSR)确定最佳胶粉掺量,以优化的主骨架空隙填充法进行橡胶沥青ATB-25配合比设计,并确定初始油石比。制备橡胶沥青ATB-25的小梁试件,开展四点弯曲疲劳试验,建立5种油石比下的疲劳寿命方程。结合湖南某高速公路橡胶沥青ATB-25的基层所受弯拉应力,得到该应力水平下橡胶沥青ATB-25的弯拉疲劳寿命与油石比的关系曲线。以同时满足橡胶沥青ATB-25弯拉疲劳寿命和剪切疲劳寿命的要求为指标,确定符合抗疲劳性能的油石比范围为4.0%~4.4%。研究结果表明:根据该油石比优化方法,设计的橡胶沥青ATB-25的抗疲劳性能可满足要求,且具有良好的高温稳定性。In order to determine the asphalt to aggregate ratio range for rubberized asphalt based on the anti-fatigue property,ATB-25,the optimal rubber powder content was determined through the conventional asphalt test and dynamic shear rheological test(DSR).The initial asphalt to aggregate ratio was then established with the optimized Course Aggregate Void Filling method for ATB-25 mixture design.ATB-25 prism specimens were prepared to carry out four-point bending fatigue tests.Through these experiments,fatigue life equations were established for five different asphalt to aggregate ratios.Combining the flexural-tensile stress experienced by the ATB-25 based layer on a certain expressway in Hunan,the relationship curve between the flexural fatigue life of ATB-25 and asphalt to aggregate ratio at that stress level was obtained.Taking ATB-25 flexural fatigue life and shear fatigue life as criteria,the asphalt to aggregate ratio that meets the anti-fatigue performance requirements was determined to be 4.0%~4.4%.Results indicates that the rubberized asphalt ATB-25 mixture designed according to optimization asphalt-aggregate ratio method meets the requirements of anti-fatigue performance,and exhibits excellent high temperature stability.

关 键 词：橡胶沥青ATB-25 动态剪切流变试验 主骨架空隙填充法 疲劳试验 油石比优化 抗疲劳性能 

分 类 号：U414[交通运输工程—道路与铁道工程]