Permeability measurement and scan imaging to assess clogging of pervious concrete pavements in parking lots

摘要: This paper describes a study that used permeability measurement along with physical and hydrological characteristics of 20 pervious concrete pavements in parking lots throughout California. The was measured at five locations: the main entrance, an area no traffic, three separate measurements within space each lot. Hydrological site such as traffic flow, erosion, vegetation cover, sediments accumulation, maintenance practice, presence cracking, rainfall, temperature data were also collected for These to perform detailed statistical analysis determine factors influencing changes hence assessing possible cause clogging. In addition, seven representative core samples obtained from four different ranging very low high. Porosity profiles produced CT scanning assess nature extent Results showed there is large variation lot between lots. general, age predominant factor permeability. Statistical revealed fine sediment (particles less than 38 μm) mass important factor. Other lower significance included number days greater 30°C amount next combined scanned image porosity profile cores most clogging occurs near surface pavement. While generally appeared be limited upper 25 mm, some evidence found up 100mm below surface.