Estimation of Hydraulic Properties in Permeable Pavement Subjected to Clogging Simulation

Guoyang Lu,Markus Oeser,Gaoyang Li,Zhihao He,Pengfei Liu,Zijian He,Hao Jiang,Ankit Gupta

doi:10.1155/2022/5091895

Guoyang Lu, Markus Oeser + Show 6 more

Open Access

https://doi.org/10.1155/2022/5091895

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Abstract

Permeable pavements are often affected by pore clogging, which leads to their functional failure and reduced service life. However, the clogging mechanism and its impact on the permeability and complex pore microstructures in pervious pavement remain unclear. The aim of current study is to quantify the clogging behavior in pervious pavement materials and carry out investigations on the development of pore characteristics and permeability. Novel polyurethane-bound pervious mixture (PUPM) was adopted for comparative study in present research with conventional Porous Asphalt (PA). The Aachen Polishing Machine (APM) was selected to perfectly serve as a simulator for clogging process of pavement in the actual service condition. The permeability and pore microstructure of the pervious pavement material were then characterized by using the self-developed permeameter and X-ray Computed Tomography (CT) scanning, respectively. The development of pore characteristics in terms of clogging was experimentally illustrated. Based on the pore characteristics, the flow behavior of PUPM subjected to different clogging periods was predicted based on the developed non-Darcy flow model. The developed experiments and analysis can further strengthen the understanding of the clogging mechanism within the porous pavement material. The results can also serve for the optimization of the pervious pavement design in the engineering application.

Highlights

Permeable pavement is a type of pavement that allows rainwater and runoff to directly infiltrate into the pavement, rather than accumulating on the pavement surface
After the loading time exceeded 30 minutes, more than 90% of the clogging agents can be found in Porous Asphalt (PA) 8
Based on the clogging simulation and permeability test, the clogging mechanism and development of hydraulic properties within the permeable pavement materials (PPM) were analyzed in depth

Summary

Introduction

Permeable pavement is a type of pavement that allows rainwater and runoff to directly infiltrate into the pavement, rather than accumulating on the pavement surface. Permeable pavement can filter pollutants and particle matters from the water. On the other hand, these particles that are present in the surface runoff can remain in the pores during the infiltration process. Based on the previous research, clogging can be mainly due to two types of siltation processes: (a) long-term clogging process by urban runoff with fine particles and (b) shortterm clogging by a sudden slump or landslide [10]. As the long-term service performance is greatly hindered by these clogging characteristics, studies have been conducted by applying fine particles accumulating in the void spaces of porous pavements based on different watering methods [11]. Clogging is found to be highly correlated with the particle size and volume, the flow rate, and pore characteristics of the pavement [12]

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