基于声发射法沥青混合料低温开裂特性研究  

Study on low temperature cracking characteristics of asphalt mixture based on acoustic emission method

作　　者：孙德生 Desheng Sun(China Construction Fifth Engineering Division Corp.LTD.,Changsha 410004,China)

机构地区：[1]中国建筑第五工程局有限公司,长沙410004

出　　处：《青海交通科技》2020年第4期87-93,共7页Qinghai Transportation Science and Technology

摘　　要：本文提出了一种评价沥青结合料低温开裂性能的声发射方法,当沥青层温度从20℃降至约-50℃时,对沥青粘结层的声学活性进行监测。结果表明:8种不同的沥青结合料在3种不同老化程度下,即未老化、短期老化(RTFO)和长期老化(PAV),声发射(AE)脆化温度对沥青结合料类型以及老化水平较敏感;另外,大多数结合料的声发射脆化温度比弯曲梁流变仪(BBR)的临界开裂温度低几度。This paper presents an acoustic emission method to evaluate the low temperature cracking performance of asphalt binder.When the temperature of the asphalt layer drops from 20℃to about-50℃,the acoustic activity of asphalt binder courses were monitored.The results show that eight different asphalt binders are sensitive to the type of binder and the aging level of the binder under three different aging degrees,namely,no aging short-term aging(RTFO)and long-term aging(PAV).In addition,the acoustic emission embrittlement temperature of most asphalt binders is a few degrees lower than the critical cracking temperature of BBR.

关 键 词：沥青混合料 低温开裂 声发射 脆化温度 弯曲梁流变仪 

分 类 号：U414[交通运输工程—道路与铁道工程]