刚性路面加铺薄层沥青设计空隙率和压实特性  

Design Porosity and Compaction Characteristics of Thin-layer Asphalt on Rigid Pavement

作　　者：刘克 杨德胜[1] 张昭 吴建良 杨锡武 张锋[1,4] LIU Ke;YANG Desheng;ZHANG Zhao;WU Jianliang;YANG Xiwu;ZHANG Feng(Chongqing Zhixiang Paving Technology Engineering Co.Ltd.,Chongqing 400067,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;College of Civil Engineering and Architecture,Hunan Institute of Science and Technology,Yueyang 414006,China;China Merchants Chongqing Communications Research&Design Institute Co.Ltd.,Chongqing 400067,China)

机构地区：[1]重庆市智翔铺道技术工程有限公司,重庆400067 [2]重庆交通大学土木工程学院,重庆400074 [3]湖南理工学院土木建筑工程学院,岳阳414006 [4]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《武汉理工大学学报（交通科学与工程版）》2022年第6期1111-1115,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：文中通过薄层组合试件室内试验、现场压实试验研究,结果表明:刚性路面加铺2.5 cm厚薄层沥青混合料芯样空隙率1.8%对应渗水系数100 mL·min^(-1),芯样空隙率2.2%对应渗水系数200 mL·min^(-1);相比常规厚度的加铺,薄层沥青混合料的渗水阈值空隙率减小约3.5%;仅增加碾压遍数不足以改善渗水,只有在设计空隙率较小、摊铺温度较高、气象正常、胶轮初压条件下,2 cm厚AC-10的渗水系数方才小于100 mL·min^(-1),因此建议用2%作为设计空隙率,压实度按100%控制,并采用较大公称粒径的混合料缓和渗水与抗滑的矛盾.薄层沥青混合料在相同时间内的料温降幅是普通厚度沥青混合料的2~3倍,复压可能低于100℃,有效压实时间较短以及刚性基面的构造受热不变形是压实困难的原因.刚性基面构造深度的改变未能明显改善刚-柔界面的结合问题.The laboratory test and field compaction test of thin-layer composite specimens were carried out.The results show that the core porosity of asphalt mixture with 2.5cm thick layer on rigid pavement is 1.8%corresponding to the water permeability coefficient of 100 mL·min^(-1),and the core porosity of 2.2%corresponds to the water permeability coefficient of 200 mL·min^(-1).Compared with conventional paving,the threshold porosity of thin-layer asphalt mixture decreases by about 3.5%.Only increasing the number of rolling passes is not enough to improve the water seepage.Only when the designed void ratio is small,the paving temperature is high,the weather is normal,and the initial pressure of the rubber wheel,the water seepage coefficient of 2cm thick AC-10 is less than 100 mL·min^(-1).Therefore,it is suggested that 2%should be used as the design void ratio,the compaction degree should be controlled by 100%,and the mixture with larger nominal particle size should be used to alleviate the contradiction between water seepage and anti-sliding.In the same time,the temperature drop of thin-layer asphalt mixture is 2~3 times that of ordinary-thickness asphalt mixture,and the recompression may be lower than 100℃.The short effective compaction time and the rigid base structure being heated without deformation are the reasons for the compaction difficulties.The change of the structural depth of the rigid base surface can not obviously improve the bonding problem of the rigid-flexible interface.

关 键 词：道路工程 超薄罩面 目标空隙率 水泥混凝土路面 精铣刨 白改黑 

分 类 号：U418.6[交通运输工程—道路与铁道工程]