摘要
试验研究结果表明:当旧路面中面层采用普通沥青时,复合芯样的变形量和变形率均明显大于中面层采用改性沥青时的情况。当中面层的沥青软化点较小、芯样复合蠕变速率较大时,其在高温条件下承载力不足,易发生塑性变形。此时由于变形不协调,超薄磨耗层出现了明显的结构性破损。沥青路面分车道养护加铺超薄磨耗层时,应重点关注旧路面的高温稳定性。
The experimental results show that when the middle layer is prepared with ordinar y asphalt in the existing pavement,the deformation value and deformation rate of composite core samples are obviously greater than the middle layer is prepared with modified asphalt.For the middle layer,when the softening point of asphalt is small and the composite creep rate of core sample is large,its bearing capacity is insufficient at high temperature,and plastic deformation is easy to occur.At this time,due to the uncoordinated deformation,the ultra-thin wearing course appears obvious structural damage.High temperature stability of the existing pavement should be paid more attention when ultra-thin wearing course is paved in lane-grade maintenance of asphalt pavement.
作者
徐文军
陈宇
郝金海
周献龙
黄考取
晏博智
朱传江
XU Wenjun;CHEN Yu;HAO Jinhai;ZHOU Xianlong;HUANG Kaoqu;YAN Bozhi;ZHU Chuanjiang(Ningbo Management Center,Zhejiang Huhangyong Expressway Co.,Ltd.,Ningbo,Zhejiang 315016,China;Zhejiang Engineering Research Center of Highway Digital and Intelligent Maintenance,Hangzhou,Zhejiang 310051,China;Branch of Design Institute,Zhejiang Communications Construction Group Co.,Ltd.,Hangzhou,Zhejiang 310051,China)
出处
《公路工程》
2023年第6期138-142,共5页
Highway Engineering
基金
浙江省交通运输厅科技计划项目(2021053)。
关键词
道路工程
超薄磨耗层
高温稳定性
加速加载试验
路面芯样
road engineering
ultra-thin wearing course
high temperature stability
accelerated loading
pavement core sample
