Yongjin Choi

Evaluation of Mechanical and Hydraulic Performance of open-graded aggregate base and permeable pavement materials using laboratory and field test devices (2017-2020)

Introduction

The permeable pavement (Fig. 2.1) is one of Low Impact Development (LID) technics that allows stormwater to infiltrate through the pavement surface and the underlying base layer, thereby reducing surface runoff and preventing water contamination. For permeable base layers of permeable pavements, open-graded aggregates (OGAs) (Fig. 2.3) are widely used to infiltrate and store stormwater in the pore of aggregate base layers (Fig. 2.2). Despite their widespread use, the mechanical and hydraulic properties of OGAs and the pavement has not been a major interest of pavement industry and society.

Fig. 2.1 Permeable pavement (Image from here)

Fig. 2.2 Structural layers of typical permeable pavement system (Bethany Eisenberg et al. 2015)

Fig. 2.3 Open-graded aggregate (OGA) for base or subbase layers (Choi et al. 2018)

We investigate the mechanical and hydraulic properties of permeable pavements or their underlying base materials, i.e., open-graded aggregates (OGAs) as follows.

Modulus-Based Compaction Compaction Quality Control (QC) of Open-Graded Aggregate Base Layers (2018 - 2020)

This study aims at investigating the mechanical behavior and modulus of permeable or open-graded aggregate base materials corresponding to compaction level based on field experiments. Five different open-graded aggregates were selected, and they were compacted in the field up to 12 passes with a 10-ton vibratory compaction roller. The mechanical behaviors and modulus of aggregates were evaluated by conducting repetitive plate load tests at 2, 4, 8, and 12 passes of roller. Fig 2.5 is research overview.

For more details, please refer to the publication [Link]

Similar research was recently conducted through comparative research based on field and laboratory tests, using light weight deflectometer (LWD) and soil stiffness gauge (SSG). These devices evaluate modulus of soil layers by applying dynamic loads. They are less time consuming then plate load tests and more convenient to use.

Fig. 2.6 Soil modulus evaluating devices

In addition to the field test mentioned before, the same five different OGAs were compacted in the specially built soil chamber to evaluate their relationship between modulus and relative compaction and to find modulus ranges that ensure proper compaction (Fig. 2.7-2.8).

For more details about this research, please refer to the publication [Link]

Fig. 2.7 Preparing of compacted test sample in soil chamber and evaluating of modulus

Fig. 2.8 Relationship between relative compaction (RC) and modulus

Development of Test Equipment and Procedure to Evaluate Permeability Characteristics of Permeable Pavements Considering Particle Clogging (2017-2018)

(Information is on updating)

Evaluation of Elastic Modulus and Layer Coefficient of Pavement Layers Based on Plate Load Tests (2017 - 2018)

(Information is on updating)

Publications and Presentations

Lee, Y., Choi, Y., Ahn, D., Ahn, J. (2021). “Prediction Models Based on Regression and Artificial Neural Network for Moduli of Layers Constituted by Open-Graded Aggregates.” Materials, 14(5), 1199. [IF 3.057]
Yongjin Choi; Donghyun Ahn; Yunje Lee; Jaehun Ahn. Compaction Quality Monitoring of Open-Graded Aggregates by Light Weight Deflectometer and Soil Stiffness Gauge. Sustainability 2020, 12, 2521 . https://doi.org/10.3390/su12062521
Choi, Y., Nguyen, T. H., Ahn, J. (2019). “Resilient Modulus and Permanent Deformation of 40 mm Open-Graded Aggregates based on Repeated-Load Triaxial Tests.” Journal of the Korean Society of Hazard Mitigation, 19(7), 367-374.
Choi, Y. (Oral presenter), Ahn, D., Nguyen, H. T., Ahn, J. (2018). “Measurement of Elastic Modulus of 40 mm Crushed Stone Aggregate with Field Compaction Effort.” Korean Society of Railway Spring Conference 2018, Jeju, South Korea.
Yongjin Choi; Donghyun Ahn; Tan Hung Nguyen; Jaehun Ahn. Assessment of Field Compaction of Aggregate Base Materials for Permeable Pavements Based on Plate Load Tests. Sustainability 2018, 10, 3817 . https://doi.org/10.3390/su10103817
Yongjin Choi, Jeongho Oh, Shin-In Han, Jaehun Ahn, Hyun-Suk Shin. Elastic Modulus and Layer Coefficient of Permeable Block Pavements Based on Plate Load Tests. Journal of the Korean Geotechnical Society 2017, 33(2), 75-80. https://doi.org/10.7843/kgs.2017.33.12.75
Choi, Y. (Oral presenter), Jalmasco, M. M., Ahn, J. (2017). “Permeability Degradation of Permeable Pavement Material due to Clogging.” JpGU-AGU Joint Meeting 2017, Chiba, Japan.

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