Effect of Clogging on the Permeability of Porous Asphalt Pavement

Yaolu Ma,Yanfen Geng,Xinlan Zhang,Xianhua Chen

doi:10.1155/2020/4851291

Yaolu Ma, Yanfen Geng + Show 2 more

Open Access

https://doi.org/10.1155/2020/4851291

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Abstract

The purpose of this paper is to report on the drainage of porous asphalt pavement evaluation method suited for use in analyzing clogging effect. To preliminarily reveal the decrease in permeability caused by clogging of permeable asphalt pavement, an innovative device was proposed to evaluate the anisotropy of permeability influenced by clogging, and the maximum drainage capacity without surface ponding can be obtained when the supplied water was controlled. Then, finite element models for asphalt pavements with hydromechanical coupling were proposed based on porous media theory and Biot’s theory. The variation in pore water pressure was simulated by considering the decrease in voids and the increase in clogging grains. The results indicate that the internally retained water should not be ignored because the semiconnected voids were filled with water rapidly at the beginning of permeability tests. To avoid surface ponding, the drainage capacity coefficient (DCC) can be used to evaluate the maximum drainage capacity (MDC) influenced by clogging. Moreover, the pore water pressure increased due to the reduction in voids and a high level of clogging. In addition, the peak value of pore water pressure is also affected by the upper-layer height of the pavement. Under the action of clogging and driving load, a reasonable thickness of the upper layer and a drainage evaluation should be considered to improve road safety.

Highlights

Permeable pavements have recently received great attention for improving driving safety because of their good drainage performance [1]
The finite element model for porous pavement with hydrodynamic response was applied based on porous media theory and Biot’s theory. e variation in pore water pressure
Clogging: 0 g Clogging: 50g (d) influenced by clogging was obtained at a certain speed using the numerical model. e following conclusions are drawn: e drainage capacity of permeable pavements is greatly decreased once the pores become clogged. e specimen can hardly drain when the clogging increases to a certain degree

Summary

Introduction

Permeable pavements have recently received great attention for improving driving safety because of their good drainage performance [1]. E clogging characteristic of the porous asphalt pavement is a common problem owing to deposition of sediments on the pavement surface, the storm water, and vehicles. It is still difficult to unify the experimental results because of the test conditions Both the constant head and falling head laboratory methods were available to determine the permeability of the asphalt mixture. Indexes, including water retention, horizontal permeability, and permeability decrease influenced by clogging, are investigated to evaluate porous asphalt mixtures. E vertical pore water pressure was simulated to analyze the influence of clogging on the permeability of pavement with different voids A numerical model with a hydrodynamic response is proposed based on porous media theory and Biot’s theory. e vertical pore water pressure was simulated to analyze the influence of clogging on the permeability of pavement with different voids

Test Material

Laboratory Modeling

Findings

Conclusions