摘要
为研究在役高速公路沥青路面中上面层的沥青混合料抗剪强度,采用单轴贯入试验和无侧限抗压强度试验,对路面不同位置处的沥青混合料芯样分别计算内摩擦角(φ)和粘聚力(c),分析沥青路面中、上面层的综合抗剪性能,并结合沥青混合料的单轴压缩动态模量对结构材料进一步评价。试验结果表明:在60℃条件下,应急车道沥青混合料粘聚力最大,行车道(基层裂缝处)粘聚力最小;行车道内摩擦角最大,应急车道内摩擦角最小;行车道抗剪强度最大,行车道(基层裂缝处)抗剪强度最小。在沥青混合料中加入纤维,可以同时提高其内摩擦角和粘聚力,从而提高路面的高温稳定性。在60℃条件下,内摩擦角与抗剪强度呈现相同的变化规律,即随着交通量的增加呈现先增加后减小的趋势。
In order to study the shear strength of existing highway middle and upper layers asphalt mixture,this paper selects uniaxial penetration test and unconfined compressive strength test to calculate the internal friction angle(φ)and cohesion(c) of asphalt mixture core samples in different positions of pavement,analyzes the comprehensive shear performance of asphalt pavement middle and upper layers,and combines the uniaxial compression dynamic modulus for further structural materials evaluation.The test results show that under the condition of 60℃,the cohesion of asphalt mixture in emergency lane is the largest,and that in carriageway(base cracking) is the smallest.The internal friction angle in carriageway is the largest,and that in emergency lane is the smallest.The shear strength of carriageway is the largest,and that in carriageway(base cracking) is the smallest.When fiber is added to asphalt mixture,the internal friction angle and cohesion is improved simultaneously,so as to improve the high temperature stability of pavement.Under the condition of 60℃,the internal friction angle and shear strength show the same change rule,that is,with the increasing of traffic volume,there is a trend of increase first and then decrease.
作者
芦子朝
胡超
韦金城
张晓萌
闫翔鹏
Lu Zizhao;Hu Chao;Wei Jincheng;Zhang Xiaomeng;Yan Xiangpeng(School of Traffic Engineering,Shandong Jianzhu University,Jinan 250101;Qilu Transportation Development Group Co.,Ltd.,Jinan 250014;Shandong Transportation Research Institute,Jinan 250031)
出处
《石油沥青》
2020年第5期37-43,共7页
Petroleum Asphalt
基金
国家重点研发计划项目2018YFB1600103
山东省重点研发计划(公益类科技攻关)2019GSF109020。
关键词
沥青混合料
面层
抗剪强度
内摩擦角
粘聚力
asphalt mixture
surface course
shear strength
friction angle
cohesion
