Ilhan Chang

Ilhan Chang
Ajou University · Department of Civil Systems Engineering

PhD
Associate Professor in the Dept. of Civil Systems Engineering at Ajou University. SURE3 GEO research group supervisor

About

90
Publications
80,998
Reads
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2,774
Citations
Citations since 2017
62 Research Items
2659 Citations
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20172018201920202021202220230200400600
Introduction
Dr. Ilhan Chang is an Associate Professor at the Department of Civil Systems Engineering, Ajou University. Prior to Ajou University, Dr. Chang accumulated professional careers at the University of New South Wales (UNSW) Australia, Korea Institute of Civil Engineering and Building Technology (KICT), and KAIST. His research group focuses on multi-disciplinary research in emerging geotechnical engineering subjects including biological soil treatment, soil erosion mitigation, and so on.
Additional affiliations
September 2020 - present
Ajou University
Position
  • Professor (Associate)
July 2018 - August 2020
UNSW Sydney
Position
  • Senior Lecturer
Description
  • Academic staff (Geotechnical engineering / Bio-soils) at UNSW Canberra
April 2017 - June 2018
UNSW Sydney
Position
  • Lecturer
Description
  • Academic staff (Geotechnical engineering / Bio-soils) at UNSW Canberra
Education
March 2006 - August 2010
Korea Advanced Institute of Science and Technology
Field of study
  • Geotechnical Engineering
March 2004 - February 2006
Korea Advanced Institute of Science and Technology
Field of study
  • Geotechnical Engineering
March 2000 - February 2004
Korea Advanced Institute of Science and Technology
Field of study
  • Civil and Environmental Engineering

Publications

Publications (90)
Article
Full-text available
Biopolymers have recently shown great potential to replace traditional binding materials in geotechnical engineering; however, more research is required to reach a deeper understanding of biopolymer-treated soil behavior. The objective of this study was to investigate the most important parameters that affect the behavior of biopolymer-treated soil...
Article
Full-text available
Recently, microbial biopolymer-based soil treatment (BPST) has gained attention for its application in environmentally friendly soil stabilization, particularly for enhancing the strength and stability of fine-grained soils. However, the effects of BPST on clay’s compressibility (consolidation) and expansion (swelling) behaviors remain unclear. Thi...
Article
Biopolymer soil treatment has been introduced as the latest technological innovation in soil stabilization and improvement. Biopolymers with agar, guar, xanthan, casein, gellan and sodium alginate have been commonly studied to improve strength, reduce hydraulic conductivity and prevent erosion of highly permeable soil materials. Among those, xantha...
Article
Full-text available
Biopolymer-based soil treatments have shown effectiveness in soil improvement, with successful field-scale implementation. In this study, we explored the effect of cyclic wetting–drying (W–D) and freezing–thawing (F–T) on the strength durability of biopolymer-treated soils. The results indicate that cyclic W–D and F–T gradually degrade soil strengt...
Article
Recently, the construction industry has focused on eco-friendly materials instead of traditional materials due to their harmful effects on the environment. To this end, biopolymers are among proper choices to improve the geotechnical behavior of problematic soils. In the current study, serish biopolymer is introduced as a new binder for the purpose...
Article
Dune sands are poorly graded collapsible soils lacking fines. This experimental study explored the technical feasibility of sustainable invigoration of fine waste materials to improve the geotechnical properties of dune sand. The fine waste considered in this study is fine marble waste. The fine waste powder was mixed with dune sand at different co...
Preprint
Full-text available
Pore-fluid salinity has a predominant effect on the formation of soil suspensions, especially for clays adjacent to the ocean, including bays, lagoons, sounds, slough, and estuaries. However, the clay response to changes in pore fluid salinity (e.g., salt intrusion or extrusion) has yet to be investigated. Herein, the influence of salinity on the m...
Article
Full-text available
Recently, environmentally friendly biological soil treatment approaches have been proposed to enhance the geotechnical engineering properties of soils. Biopolymer-based soil treatment (BPST) has been verified by extensive laboratory-scale studies as an effective ground improvement method and suggested as a new reinforcing approach for levee slope o...
Article
Full-text available
Xanthan gum (XG) biopolymer-based soil treatment is an effective soil improvement method. In this study, we explored the effect of XG on the undrained shear strength of clays (kaolinite and montmorillonite) in chemically distinct pore fluids. Among the pore fluids tested, the undrained shear strength of kaolinite was the highest in kerosene, follow...
Article
The strengthening behavior of crosslinked starch using malonic acid is examined in this study. Since the conventional binding materials used in construction engineering practices have been shown to be environmentally hazardous, the use of eco-friendly and biological approaches (e.g. microbial induced calcite precipitation, biopolymer-based soil tre...
Article
Full-text available
Recently, cases for inevitable adjacent construction are increasing due to the limited spaces in urban area. When a new structure is constructed near an existing structure, interference effects induced by the pre-existing structure should be considered. Thus, numbers of studies have been conducted to investigate the effects of adjacent construction...
Article
Full-text available
Microbial biopolymers have been introduced as materials for soil treatment and ground improvement purposes because of their ability to enhance soil strength enhancement and to reduce hydraulic conductivity. Several studies in the field of environmental engineering have reported heavy metal adsorption and removal from contaminated water using common...
Article
Full-text available
Soil improvement using biopolymers has attracted considerable attention in recent years, with the aim to reduce the harmful environmental effects of traditional materials, such as cement. This paper aims to provide a review on the environmental assessment of using biopolymers as binders in soil improvement, biopolymer-treated soil characteristics,...
Chapter
Full-text available
With an increasing need for civil infrastructures owing to increasing populations and growing concerns on climate change, the need for sustainable construction material has become ever more present. Worldwide sustainable development has led to various technologies and materials for various engineering practices. Among such developments, the use of...
Article
Full-text available
The resistance of soil to the tractive force of flowing water is one of the essential parameters for the stability of the soil when directly exposed to the movement of water such as in rivers and ocean beds. Biopolymers, which are new to sustainable geotechnical engineering practices, are known to enhance the mechanical properties of soil. This stu...
Article
Full-text available
Injection grouting is one of the most common ground improvement practice to increase the strength and reduce the hydraulic conductivity of soils. Owing to the environmental concerns of conventional grout materials, such as cement-based or silicate-based materials, bio-inspired biogeotechnical approaches are considered to be new sustainable and envi...
Conference Paper
In this study, a two-dimensional model test has been conducted to evaluate the pullout resistance enhancement effect induced by an expansion zone along a ground reinforcement (e.g. anchor) member. Different forms of the expansion zone have been considered with different widths as 10 mm, 20 mm, 40 mm. The results provide an empirical correlation bet...
Article
Full-text available
Managing sediments dredged from reservoirs of recharge dams is an environmental issue, however, these sediments can be an abundant and economical source of fine-grained fill soil. This experimental investigation quantifies the geotechnical properties of a reservoir sediment used to improve engineering properties of a poorly graded dune sand in Oman...
Article
Full-text available
Recently, environment-friendly microbial biopolymer has been widely applied as a new construction material in geotechnical engineering practices including soil stabilization, slope protection, and ground injection. Biopolymer is known to exhibit substantial improvements in geotechnical properties, such as shear strength enhancement and hydraulic co...
Article
Full-text available
The importance of permeable and pervious pavements in reducing urban stormwater runoff and improving water quality is growing. Here, a new pervious pavement block material based on recycled polyethylene terephthalate (PET) waste is introduced, which could contribute to reducing global plastic waste via PET’s utilization for construction material fa...
Article
Full-text available
Various applications of biopolymer-based soil treatment (BPST) in geotechnical engineering have been implemented in recent years, including dust control, soil strengthening and erosion control. Despite BPST methods can ensure the effectiveness of engineering while meeting environmental protection requirements, BPST technology requires further valid...
Article
Full-text available
Exocultured biopolymers are ecofriendly soil-stabilisation agents with superior particle bonding, hydrogel-formation characteristics and zero endoculture duration. However, the use of exocultured biopolymers for enhancing soil resistance against surface erosion by water flow is yet to be investigated. Using erosion function apparatus (EFA) in combi...
Article
Full-text available
p>Microbial biopolymers are introduced as a new soil binder which regarded to be environmentally-friendly materials in terms of low carbon emission and low impact on the soil ecosystem. In geotechnical engineering and agriculture, various gel-type materials have been used to improve the water absorbability of sandy soils, and control surface erosio...
Article
Full-text available
This study reviews the fundamental mechanisms of biological soil improvement methods—microbially induced calcium carbonate precipitation (MICP) and biopolymer treatment (BPT). Extensive experimental data on various geotechnical properties of sands treated by MICP and BPT are compiled, including the unconfined compressive strength, Mohr-Coulomb shea...
Conference Paper
Full-text available
Microbial biopolymers have recently been widely studied as a new class of environmentally friendly materials that can be used to enhance the strength of geotechnical engineering structures but also to reduce the use of cement. This study aims to investigate the feasibility of using microbial biopolymers to reduce water-induced erosion of cohesionle...
Article
Full-text available
Currently, soil stabilization is used in road construction in Sri Lanka, especially for soft road shoulders. The socioeconomic demand for sustainable development has raised the necessity of new environmentally friendly soil binders for construction engineering practices, including road construction. Industrial residues such as fly and bottom ashes...
Article
Full-text available
Global warming and climate change caused by greenhouse gas (GHG) emissions have rapidly increased the occurrence of abnormal climate events, and both the scale and frequency of geotechnical engineering hazards (GEHs) accordingly. In response, geotechnical engineers have a responsibility to provide countermeasures to mitigate GEHs through various gr...
Conference Paper
Full-text available
The use of a hydraulic barrier to prevent or constrain the water flow or/and residual contaminant-containing water from leaking, flowing into underground constructions such as tunnels has been addressed in the past decades. There are different types of barrier materials used to improve hydraulic properties such as soil-bentonite, cement-bentonite,...
Article
Full-text available
Soft marine soil has high fine-grained soil content and in-situ water content. Thus, it has low shear strength and bearing capacity and is susceptible to a large settlement, which leads to difficulties with coastal infrastructure construction. Therefore, strength improvement and settlement control are essential considerations for construction on so...
Article
Full-text available
Vegetation cover plays a vital role in stabilizing the soil structure, thereby contributing to surface erosion control. Surface vegetation acts as a shelterbelt that controls the flow velocity and reduces the kinetic energy of the water near the soil surface, whereas vegetation roots reinforce the soil via the formation of root-particle interaction...
Article
Full-text available
Gel-type biopolymers have recently been introduced as environmentally friendly soil binders and have shown substantial strengthening effects in laboratory experimental programs. Although the strengthening effects of biopolymer-treated sands have been verified in previous direct shear tests and uniaxial compression tests, there has been no attempt t...
Article
Full-text available
Microbial biopolymers have recently been introduced as a new material for soil treatment and improvement. Biopolymers provide significant strengthening to soil, even in small quantities (i.e., at 1/10th or less of the required amount of conventional binders, such as cement). In particular, thermo-gelating biopolymers, including agar gum, gellan gum...
Conference Paper
Full-text available
Due to the promising potential of biopolymer as an environmentally friendly soil binder, bi-opolymers are actively attempted for soil strengthening through various research, nowadays. However, most previous studies have focused on the mechanical behavior of biopolymer-treated soils with the lack of detail microscopic investigation. Thus, this study...
Conference Paper
Recently, soil strengthening using gel-type biopolymers have been attempted by many researchers. However, most previous studies have been conducted by focusing on feasibility of biopolymers as a new soil binder with lack of in situ considerations (e.g., confinement and strainstress related variation). This study aims to investigate the shear behavi...
Article
Full-text available
Biopolymer-soil technology is recognized as an environmentally friendly soil improvement method for geotechnical engineering practices nowadays. However, concerns exist regarding biopolymer fine-soil applications because the performance of biopolymers is based on an electrical interaction with clay or a pore-fluid. Thus, the effect of water content...
Article
Full-text available
Geotechnical construction is responsible for the overall stability of superstructures, and if there are design errors, the structure will be exposed to potential problems. Geotechnical design starts with the correct interpretation of the target ground. Southeastern Iraq is mainly comprised of an alluvial plain with diverse geological features, and,...
Conference Paper
In micro-mechanical aspects of fine grained soil, interaction between clay and pore fluid determines overall behavior of soil such as strength, permeability, adsorption capability etc. Previous studies and theories have suggested that clay particles form different structure depending on the electro-chemical properties of fluids such as pH, ion conc...
Conference Paper
Full-text available
Microbial biopolymers have significantly contributed and applied in modern food, medicine, and petroleum industries. Recently, rheological properties of biopolymers, including high water holding capacity, high viscosity (shear stiffness) became main components to introduce biopolymers in various soil stabilization and geotechnical engineering purpo...
Article
Full-text available
Direct use of naturally occurring microbes for soil improvement has recently gained attention due to their ubiquitous and versatile characteristics in subsurface soil. Microbes produce soft and sticky extracellular polymeric substances (or biopolymers) that are known to alter the hydrological characteristics of soils; however, the mechanisms and ex...
Conference Paper
Full-text available
Biopolymer-soil treatment shows high potential to be used in various geotechnical engineering practices. Previous studies show appropriate performance of biopolymer on soil strength improvement and hydraulic instability reduction. In this study, the capillary conductivity of biopolymer-treated soils is investigated via laboratory testing. A mini co...
Article
Approximately one-third of the edible parts of food is lost or wasted globally. For milk, 18.1% of its annual production is lost or wasted due to insufficient storage, logistics, and freshness (expiration date) issues. Presently, the most common method of managing waste milk is disposing large volumes of waste milk into landfills, which raises conc...
Article
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Lunar exploration, which slowed in the 21st century after the Apollo program, has seen more activity recently with the participation of Asian countries such as Japan, China, and India. Because lunar modules and rovers cannot be tested directly on lunar soil, these countries have developed lunar simulants. Simulating lunar soil is difficult and expe...
Conference Paper
Full-text available
Today there is an increasing number of biopolymer applications for environment-friendly soil improvement and erosion prevention. For lower cost and human safety, biopolymers with agar, guar, xanthan, casein, gellan, and sodium alginate have been commonly studied to improve strength and to decrease the hydraulic conductivity of highly permeable soil...
Article
Various biological approaches recently have been explored as alternative environmentally-friendly soil improvement strategies in the fields of construction and geotechnical engineering, with the aim of reducing the use of high greenhouse gas emitting construction binders such as cement. Previous studies have shown the effectiveness of microbial bio...
Article
Full-text available
Liquefaction generally occurs in loose sandy soils, whereas static (i.e., post) liquefaction is reported to occasionally take place in gravel soils (i.e., gravel-sand mixtures). Recent studies imply specific in situ parameters such as relative density or effective stress correlate with the static liquefaction potential of gravel soils, although the...
Article
Full-text available
Biopolymer treatment of geomaterials to develop sustainable geotechnical systems is an important step towards the reduction of global warming. The cutting edge technology of biopolymer treatment is not only environment friendly but also has widespread application. This paper presents the strength and slake durability characteristics of biopolymer-t...
Article
Full-text available
The coagulation or flocculation of cohesive clay suspensions is one of the most widely used treatment technologies for contaminated water. Flocculated clay can transport pollutants and nutrients in ground water. Coagulants are used to accelerate these mechanisms. However, existing coagulants (e.g., polyacrylamide, polyaluminum chloride) are known t...
Article
Full-text available
Conventional geotechnical engineering soil binders such as ordinary cement or lime have environmental issues in terms of sustainable development. Thus, environmentally friendly materials have attracted considerable interest in modern geotechnical engineering. Microbial biopolymers are being actively developed in order to improve geotechnical engine...
Article
Full-text available
Due to numerous environmental concerns in recent years, the search for and the development of sustainable technologies have been pursued. In particular, environmentally friendly methods of soil improvement, such as the potential use of biopolymers, have been researched. Previous studies on the use of biopolymers in soil improvement have shown that...
Article
Full-text available
Deep Cement Mixing (DCM) is the most commonly employed ground improvement method for offshore construction purposes worldwide. Nevertheless, the dynamic behavior of cement-mixed and stabilized clays is almost unknown due to the lack of experimental studies, while seismic concerns regarding offshore structures related to typhoons, tsunamis, or earth...