Measurement of Permeability in Horizontal Direction of Open-Graded Friction Course with Rutting

Jaewon Yoo,Jaehun Ahn,Tan Hung Nguyen,Eungu Lee,Yunje Lee

doi:10.3390/su12166428

Jaewon Yoo, Jaehun Ahn + Show 3 more

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https://doi.org/10.3390/su12166428

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Journal: Sustainability	Publication Date: Aug 10, 2020
Citations: 4	License type: CC BY 4.0

Affiliation: Pusan National University, Can Tho University

Abstract

Although the permeability of open-graded friction course (OGFC) materials in the transverse direction and the reduction in permeability associated with long-term traffic loading are important issues, they have remained under researched thus far. In this study, testing equipment and procedure were developed to evaluate the permeability of an OGFC specimen along the horizontal direction and its reduction due to rutting. Horizontal permeability tests were conducted by varying the hydraulic gradient of specimens with porosities of 19.6%, 15.6%, and 10.3%. The reduction in cross-section due to traffic loading was simulated via a wheel tracking test, and the permeability was subsequently evaluated. The reliability of test methodology was successfully verified; the tendency of the relationship between discharge velocity and hydraulic gradient was in good agreement with existing research results. The reduction in cross-sectional flow area due to rutting decreased and the horizontal permeability. The test results using developed testing equipment will enable efficient OGFC design.

Highlights

Problems such as decline in ground water levels, depletion of ground water resources, and increase in flood damage in densely developed areas are becoming increasingly common in the current modern society, because urbanization has led to a decrease in green and permeable areas and an expansion of impervious areas
This study is aimed at developing laboratory-scale equipment to evaluate the permeability of an open-graded friction course (OGFC) specimen in the horizontal direction and the pore reduction caused by traffic loading
Horizontal permeability tests were performed on the OGFC specimens with porosities of 19.6%, 15.6%, and 10.3%

Summary

Introduction

Problems such as decline in ground water levels, depletion of ground water resources, and increase in flood damage in densely developed areas are becoming increasingly common in the current modern society, because urbanization has led to a decrease in green and permeable areas and an expansion of impervious areas. Low impact developments (LIDs) have been suggested as a suitable approach for resolving such water-related environmental issues and for recovering the water circulation in urban environments. A LID considers the integrated hydrological system, administration of the small-scale distribution, source management, and diversity based on the water circulation characteristics under natural conditions, by applying the concept of better site design devised by Prince George’s County Department of Environmental Resources, Maryland, U.S.A., while planning integrated facilities. Such LID facilities in metropolitan regions have been reviewed intensively to reduce the damage caused by floods and non-point source pollution [3,4,5,6]

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