Permeable pavements provide a frictional surface for vehicles during rainfall runoff and function as a porous infrastructure interface, allowing the infiltration and evaporation of rainfall runoff, as well as treatment of pollutants when designed for solute and particulate separation. The hydraulic conductivity (ksat) of permeable pavement is an important hydraulic property. A series of empirical and pore structure models using constant head and pore-based measurements, including total porosity (φt), effective porosity (φe), and pore size distribution indices generated through X-ray tomography (XRT) were used to study permeable pavement. XRT results indicate that the pore matrix is heterodisperse, with φt ≠ φe. Results indicate that the traditional models based on a simple pore structure do not reproduce measured ksat values. More complex pore structure models, even with modification from the original form, gave better results. A modified Kozeny-Kovàcs model was used to reproduce the measured ksat values. The modified model introduces φe and the characteristic pore diameter (De) instead of φt and specific surface area, respectively. Such permeable pavement pore structure parameters with the modified Kozeny-Kovàcs model can be predicted. These results can be useful in the design stage of permeable pavement when a target value of ksat is desired to obtain both friction benefits to improve vehicle safety in wet conditions and to control the infiltration-evaporation of rainfall. The ksat results are combined with continuous simulation modeling using historical rainfall for a Cincinnati, Ohio, highway site on I-75 to provide results illustrating permeable pavement as a low impact development infrastructure component in the highway environment.
Application of Kozeny–Kovàcs Model to Predict the Hydraulic Conductivity of Permeable Pavements
Transportation Research Record: Journal of the Transportation Research Board
Transportation Research Record: Journal of the Transportation Research Board ; 2195 , 1 ; 168-176
2010-01-01
Article (Journal)
Electronic Resource
English
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