多孔沥青混合料关键筛孔通过率对其性能的影响研究  

Study on the Influence of Key Passing Sieve of Porous Asphalt Mixture on Its Performance

作　　者：尹龙 刘泉[2] Yin Long;Liu Quan(Jiangsu Communications Holding Co.,Ltd.,Nanjing 210019,China;College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]江苏交通控股有限公司,江苏南京210019 [2]河海大学土木与交通学院,江苏南京210098

出　　处：《市政技术》2025年第2期207-213,共7页Journal of Municipal Technology

基　　金：国家自然科学基金项目(52408477);江苏省自然科学基金-青年基金项目(BK20220983)。

摘　　要：多孔沥青混合料在获得良好透水性能的同时需要兼顾长期性能的稳定。为此,研究了关键筛孔通过率对多孔沥青混合料性能的影响。基于离散元法构建了5种多孔沥青混合料骨架模型,以颗粒间不同接触类型的接触数量为指标,分析了5种多孔沥青混合料骨架的形成特点,提出以关键筛孔通过率为控制指标的级配设计思路,进一步评估了多孔沥青混合料的高温稳定性、低温抗裂性以及水稳定性,并依托实体工程开展了长达7年的路面技术状况观测。结果表明,当9.5 mm筛孔通过率在60%~70%时,空隙率、飞散损失和渗透系数达到均衡。经过7年服役期后,仅路面抗滑性能衰减较快,其他路面技术状况性能良好。9.5 mm筛孔通过率可以作为多孔沥青混合料设计的重要控制指标,当通过率在60%~70%时,颗粒骨架的受力特征较为均衡,因此表现出较好的混合料性能。While achieving optimal water permeability,the porous asphalt mixture must consider long-term stability.This study investigates the impact of key passing rates on the performance of porous asphalt mixtures.Skelton models for five types of porous asphalt mixtures were constructed using the discrete element method.The contact numbers between particles was looked as indicators to analyze the formation characteristics of 5 types of porous asphalt mix-tures skeletons.An grading design that a key sieve passing rate was control index was proposed.Furthermore,high temperature stability,low temperature crack resistance,and water stability of the designed mixture were furtherly evaluated.A 7-year pavement technology observation was carried out to validate the engineering performance.The results indicated that a 60%~70%passing rate for the 9.5 mm sieve achieves equilibrium in void,mass loss,and permeability coefficient.After 7 years of service,only surface skid resistance deteriorates quickly while other tech-nical performances remain good.9.5 mm sieve can be considered an important control index for designing porous as-phalt mixtures.With 60%~70% passing rate,the stress characteristics of the particle skeleton was in balance,re-sulting in improved mixture performance.

关 键 词：多孔沥青混合料 关键筛孔通过率 骨架分析 长期性能 工程验证 

分 类 号：U416.217[交通运输工程—道路与铁道工程]