多孔沥青混合料排水性能研究与空隙率确定  

Study on Drainage Performance and Determination of Air Voids of Porous Asphalt Mixture

作　　者：张建红 张少恒 董富坤 禹昊文 ZHANG Jianhong;ZHANG Shaoheng;DONG Fukun;YU Haowen(Tibet Tianlu Co.,Ltd.,Lhasa 850010,China)

机构地区：[1]西藏天路股份有限公司,拉萨850010

出　　处：《现代交通技术》2023年第5期31-35,共5页Modern Transportation Technology

摘　　要：多孔沥青路面在降雨等条件下的内部排水情况复杂,采用单一的横向或纵向的渗透系数,并不能说明多孔混合料的排水能力。通过模拟降雨试验,研究了多孔沥青路面的极限排水强度及其与目标空隙率和连通空隙率之间的关系。通过测量排水表层的最大瞬时降雨强度,可以更好地理解多孔沥青混合料的性能。结果表明,当空隙率从18%增大至25%时,试件排水能力提高了近3倍,目标空隙率与极限排水强度呈线性相关关系。对混合料进行路用性能检测发现,在冬冷区(年极端最低气温-21.5~-9.0℃)或冬温区(年极端最低气温>-9.0℃),空隙率在20%~22%时符合规范要求;在冬寒区(年极端最低气温-37.0~-21.5℃),空隙率为20%~21%时,性能符合相关规范要求。The internal drainage of porous asphalt pavement under rainfall and other conditions is complex,and using a single lateral or longitudinal permeability coefficient cannot explain the drainage capacity of porous mixture.In this paper,the ulti-mate drainage strength of porous pavement and its relationship with target air voids and connected air voids were studied through simulated rainfall experiments.By measuring the maximum instantaneous rainfall intensity of the drainage surface lay-er,the performance of porous asphalt mixtures can be better understood.The results show that when the void fraction increases from 18%to 25%,the drainage capacity of the specimen increases by nearly four times.The target air voids have a linear cor-relation with the ultimate drainage strength.Conduct road performance testing on the mixture,and the performance meets the specification requirements when the air voids are 20%~22%in cold winter areas(the extreme minimum temperature is-21.5~-9.0℃)or moderate winter areas(the extreme minimum temperature is above-9.0℃),and when the air voids are 20%~21%in cold winter areas(the extreme minimum temperature is-37.0~-21.5℃).

关 键 词：多孔沥青路面 空隙率 连通空隙率 极限排水强度 

分 类 号：U416.217[交通运输工程—道路与铁道工程]