大空隙沥青混凝土空隙堵塞特性研究  

Study on the Clogging Characterization of Large Void Asphalt Concrete

作　　者：顾盛[1,3] 陈满军 林莉[1] 王炯月[2] 马翔 GU Sheng;CHEN Manjun;LIN Li;WANG Jiongyue;MA Xiang(Kunshan Construct Engineering Quality Testing Center,Kunshan 215337,China;College of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)

机构地区：[1]昆山市建设工程质量检测中心,江苏昆山215337 [2]南京林业大学土木工程学院,南京210037 [3]东南大学土木工程学院,南京211189

出　　处：《森林工程》2021年第3期126-130,共5页Forest Engineering

基　　金：国家自然科学基金资助项目(60472120);河北省交通运输厅科技项目(TH1-202013);苏州市科技计划项目(SS202032)。

摘　　要：为研究排水性沥青混凝土在使用过程中的堵塞特性,采用自行开发的大空隙沥青混凝土渗透系数测试装置,研究2种不同堵塞方式对大空隙沥青混凝土渗透系数的影响,并通过CT扫描其内部细观空隙结构。研究表明:渗流方向的渗透系数受堵塞剂影响严重;堵塞剂质量相同时,堵塞物含量小的堵塞剂对大空隙沥青混合料的堵塞更严重;多次堵塞及一次性堵塞的试件,其竖向及横向扫描出的长轴与短轴值均小于基准试件;堵塞过程中空隙率的减小主要是大孔数量及大孔比在减小,在细料堵塞后,大孔逐渐演变为中孔,导致中孔比增加。堵塞物沿着渗流方向在空隙中的滞留导致排水性路面渗透系数减小、排水功能衰减。In order to study the clogging characterization of the porous asphalt concrete during the service period,the influence of two different plugging methods on the permeability coefficient of large-void asphalt concrete was studied by using the self-developed large-void asphalt concrete permeability coefficient test device,and CT scanning was used to study the mesoscopic void structure of the plugged specimen.The results showed that the plugging agent mainly affected the permeability coefficient of the seepage direction.When the quality of the plugging agent was the same,the plugging agent with small plugging material content would be more serious to the large void asphalt mixture.For the specimens with multiple blockages and one-time blockage,the long axis and short axis values scanned vertically and horizontally were smaller than the reference specimen.The decrease of the void ratio during the blockage process was mainly due to the decrease in the number of large voids and the large void ratio.After the clogging of the fine material was added,the large void gradually evolved into medium void,resulting in an increase in the medium void ratio.The retention of the clogs in the void along the seepage direction lead to the decrease of the permeability coefficient and the attenuation of drainage function of the drainage pavement.

关 键 词：大空隙沥青混合料 CT扫描 堵塞行为 细观空隙结构 

分 类 号：TU528.42[建筑科学—建筑技术科学]