Jongwon Jung

Chungbuk National University · School of Civil Engineering

Biomass has been used as agriculture, forest and energy resources. The combustion of biomass matter becomes biomass ash that is dumped without control or disposed in landfills. Thus, the recycling or treatment of biomass ash is required. Wood ash is one of largest portion of biomass ash. Therefore, the recycling of wood ash in construction area wil...

To prevent liquefaction, various preventive measures using cement such as consolidation process and grouting have been proposed. However, since liquefaction prevention measures using cement cause environmental problems such as groundwater pollution and increased carbon dioxide emissions, it is necessary to develop eco-friendly ground reinforcement...

The present study investigates the impact of freeze–thaw deterioration on the electrical properties and electric-heating capabilities of cement mortar incorporating with carbon nanotubes (CNT) and carbon fibers (CF). Mortar samples, containing 0.5 wt.% CNT and 0.1 wt.% CF relative to the mass of cement, were prepared and subjected to freeze–thaw te...

Jang, J.; Gang, S.; Marjadi, H.K.; Jang, J., and Jung, J., 2023. Swelling behavior of soils due to changes in ionic concentration of pore-water: Impacts on coastal sediments. In: Lee, J.L.; Lee, H.; Min, B.I.; Chang, J.-I.; Cho, G.T.; Yoon, J.-S., and Lee, J. (eds.), Multidisciplinary Approaches to Coastal and Marine Management. Journal of Coastal...

According to previous research results that carbon dioxide (CO2) emitted through various industrial activities causes global warming, interest in carbon dioxide storage is increasing. Carbon capture and storage (CCS) in the ground requires geotechnical understanding, such as rock stability and fluid flow in porous media. The injection efficiency of...

Freshwater generation has been extensively studied to address the global freshwater scarcity issue, although designing a simple, inexpensive system with high efficiency and sustainability is complicated. Solar‐driven water evaporation is a promising, highly efficient water purification strategy. This paper reports the synthesis of a hydrophilic con...

In this study, a finite element model updating method which can consider soil-structure interaction was developed to analyze the effect of soil properties on the structural response while considering interaction between the soil and the structure. Additionally, LS-DYNA, a commercial finite element program, was included in the loop of the proposed t...

Interest in liquefaction has increased owing to the increasing occurrence of liquefaction in the country. According to previous studies, factors that influence liquefaction include the grain size distribution, plasticity, relative density, overconsolidation ratio, and confining conditions. In this study, the liquefaction possibility was evaluated b...

Biopolymers used for ecofriendly ground improvement lead to various effects, such as strength increase, hydraulic conductivity reduction, and vegetation enhancement. However, related studies evaluate the mechanical performance of a biopolymer-stabilized soil by simple mixing of the biopolymer and the soil. In this study, the injection performance o...

In Korea, the frequency of landslides and debris flow increases because of the concentration of rainfall in summer, which results in increased damage. Therefore, the shear characteristics of granite-weathered soil, including fine particles, were investigated using a ring shear test apparatus to evaluate the flowability of debris. For a reliable she...

Determining the parameters related to unsaturated soil properties considering capillary and adsorption phenomena is challenging. In addition, the matric suction generated in unsaturated soil increases the stability of the slope; however, the decrease in matric suction owing to heavy rain causes a decrease in slope stability. Therefore, it is crucia...

Gas production from hydrate-bearing sediments requires methane dissociation, which induces two-phase gas flow, mobilizing fine clay particles from within saturated pores. Fines migration within sandy sediments results in subsequent pore clogging, reducing reservoir connectivity. Sediments complex pore morphology, require direct 3D microscopic pore-...

The role of wettability, often characterized by contact angle (θ), in two-phase immiscible phases displacement is not well understood. In this study, the color gradient lattice Boltzmann method (LBM), capable of maintaining the prescribed θ (from 0°to 180°at intervals of 10°) throughout the numerical simulations, was used to investigate the displac...

In this study, a finite element model updating method which can consider soil-structure interaction was developed to analyze the effect of soil properties on the structural response while considering interaction between the soil and the structure. Additionally, LS-DYNA, a commercial finite element program, was included in the loop of the proposed t...

In recent years, various nanocomposites based on the inherent properties of nanofillers have been actively investigated. When nanoparticles are incorporated into a polymeric matrix, such as nylon, polyurethane, or polypropylene, lightweight composites with excellent strength can be fabricated. Given the rapid developments in nanotechnology, nanocom...

Recently, research on the use of biopolymers for environmentally friendly soil improvement has been actively conducted. Biopolymer soil treatment has various effects, such as the enhancement of soil strength, reduction of hydraulic conductivity, and enhancement of vegetation. In this study, the flow and injection characteristics of guar gum solutio...

An experiment to evaluate the swelling characteristics during saturation of representative clay minerals, kaolinite, illite, montmorillonite, and bentonite, according to the ionic strength of the pore water, was conducted. The results showed that in distilled water (DW), the average swelling ratios of kaolinite, illite, and bentonite were 10.95%, 1...

Abnormal weather phenomena debris damage has recently been increasing worldwide. As primary rheological properties, the yield stress and plastic viscosity of muddy materials affect the flow distance and velocity. Therefore, in this study, direct and indirect measurement test methods for rheological properties and factors affecting the these propert...

One of the purposes of earthquake engineering is to mitigate the damages in buildings and infrastructures and, therefore, reduce the impact of earthquakes on society. Seismic ground response analysis refers to the process of evaluating the ground surface motions based on the bedrock motion. On the other hand, deep learning techniques have been deve...

In the seismic design of pile foundations, a p-y curve representing the nonlinear behavior of the ground considering the dynamic load of the earthquake is required. Recently, p-y curve analyses reflecting the soil-structure interaction have been conducted, but studies on multilayer structures have not been investigated extensively. In this study, t...

Coastal areas have environmentally and economically important roles but tend have weak soft ground, which is often vulnerable by waves and unsuitable for coastal construction, such as ports and waterfront areas. Hence, this soft ground, which usually contains large amounts of clays, needs to be ameliorated by using appropriate soil improvement tech...

Recent tragedies have demonstrated that natural disasters, such as earthquakes and typhoons, can wreak havoc on society. Numerical models and simulations are used for predicting the structural response and damage caused by disasters. However, some structures do not have any design drawings or numerical models, and thus, problems are encountered whe...

Ground reinforcement is a method used to reduce the damage caused by earthquakes. Usually, cement-based reinforcement methods are used because they are inexpensive and show excellent performance. Recently, however, reinforcement methods using eco-friendly materials have been proposed due to environmental issues. In this study, the cement reinforcem...

Modeling the soil–structure interaction (SSI) in seismic design involves the use of soil response curves for single-degree-of-freedom (SDOF) structures; however, real structures have multiple degrees of freedom (MDOF). In this study, shaking-table-derived p-y curves for SDOF and MDOF superstructures were compared using numerical analysis. It was fo...

The slope stability evaluation of reservoirs is required because of the aging of reservoirs. Reservoir levees are designed to achieve homogeneous construction, but the spatial heterogeneity of the material properties of reservoirs is unavoidable. Because the existing method for evaluating reservoir stability is limited in terms of considering the s...

Owing to the development of construction technology, structures are becoming increasingly taller. Furthermore, with the improvement in construction materials, the service life of the structures is also increasing. The increased service life of large structures has highlighted the importance of structure maintenance and performance evaluation; thus,...

This study explored the feasibility of biosurfactant amendment in modifying the interfacial characteristics of carbon dioxide (CO 2) with rock minerals under high-pressure conditions for GCS. In particular, while varying the CO 2 phase and the rock mineral, we quantitatively examined the production of biosurfactants by Bacillus subtilis and their e...

Approximately 76% of the reservoirs built in Korea are facilities that are more than 50 years old. The risk of disasters has increased because of reservoir aging and the deepening polarization of drought and floods caused by abnormal weather conditions. In addition, the number of earthquakes has been gradually increasing in Korea, and anxiety has i...

In Korea, earthquakes have continued to occur even after the occurrence of Gyeongju and Pohang earthquakes of 2016 and 2017, respectively, raising awareness of earthquakes. Because earthquakes cause damage to not only structures but also humans, it is essential to improve the seismic performance and design earthquake-resistant structures to minimiz...

Alginic acid sodium salt is a type of biopolymer. It is a polysaccharide obtained from the most widely distributed brown algae among marine plants. Its main characteristics are nontoxicity and biodegradability. It is also considered a natural eco-friendly material because it is completely decomposed by microorganisms using only water and carbon dio...

CH4–CO2 replacement method has the advantages of sequestering carbon dioxide and sediment stability compared to other methods such as depressurization and thermal stimulation. However, the production efficiency using CH4–CO2 replacement method is lower than any other method. In this study, effects of soaking process on CH4–CO2 replacement efficienc...

CH4-CO2 replacement has been considered as a method for methane production from hydrate-bearing sediments to maintain sediment stability. Sediment stability has been studied at both the particle scale and mesoscale. However, the shear stiffness of sediments has not yet been explored. Moreover, the effects of CO2 and CO2-N2 mixtures as injection flu...

A better understanding of the kinetics of hydrate dissociation is essential to reliably predict gas production potential from natural hydrate reservoirs. Most hydrate dissociation models assume hydrates to be a constant number of equal-sized spheres dissociating at a constant rate. This paper uses dynamic 3D synchrotron micro-computed tomography (S...

The methane gas hydrate stored in natural sediments is considered a potential gas resource. Countries such as China, India, Japan, and Korea are interested in commercializing this resource, and offshore field pilot tests for gas production have been conducted using depressurization methods to destabilize gas hydrate and facilitate the migration of...

In this study, we synthesized a Prussian blue (PB)-embedded macroporous carboxymethyl cellulose nanofibril (CMCNF) membrane for facile cesium (Cs) removal. The PB was formed in situ at Fe3+ sites on a CMCNF framework cross-linked using FeCl3 as a cross-linking agent. Cubic PB particles of size 5-20 nm were observed on the macroporous CMCNF membrane...

The availability of natural gas hydrates and the continuing increase in energy demand, motivated researchers to consider gas hydrates as a future source of energy. Fundamental understanding of hydrate dissociation kinetics is essential to improve techniques of gas production from natural hydrates reservoirs. During hydrate dissociation, bonds betwe...

Availability of natural hydrates and ongoing rise in demand for energy, motivated researchers to consider hydrates as a potential energy source. Prior to gas production operations from hydrate-bearing sediments, hydrate dissociation is required to release gas into sediments. To reliably predict natural hydrate reservoir gas production potential, a...

In sandy reservoirs, selecting a representative elementary volume (REV) for the pore scale, is essential for predictive upscaling toward the reservoir scale. The porosity and tortuosity of a sand media are used for REV selection. The profile and size of sand grains, forms the voids morphology; as a result, hypothetically the grains size distributio...

Carbon sequestration in geological formations is in demand for many applications, especially energy production from hydrates. During gas production in a sandy hydrate reservoir, two phase flow and changes in confinement takes place. Nine fully saturated sand systems were scanned three times; before, during and after CO2 gas injection. The confineme...

Recent advances in microfluidics technology can significantly benefit engineering and science research. Through integration with current optical tools like the optical/confocal microscope, the 3D printing, the soft lithography, and the lithography–etching, microfluidic pore model offers a direct and visual way to study the process of geological rel...

Methane hydrates are promising unconventional energy source with natural reserves above 1,000 Trillion m3. Hydrates are found in saturated sandy sediments, where multi-phase flow of gas takes place through sediment's pores, physical phenomenon at pore-scale controls flow properties. Gas permeability is highly affected by fines type due to migration...

Depressurization of hydrate-bearing sediments (HBS) is inevitably accompanied with sediment transport, not only structural host sediment itself but also fine particles, which can be a significant problem in producing gases from HBS, as demonstrated in recent field-scale hydrate production tests. Particularly, the migration of fine sediment particle...

The migration of fine particles in porous media has been studied for different applications, including gas production from hydrate-bearing sediments. The clogging behavior of fine particles is affected by fine particle-pore throat size ratio, fine particle concentration, ionic concentration of fluids, and single/multiphase fluid flow. While previou...

One of the most effective methods of mitigating carbon dioxide emission is geological sequestration, in which an enormous amount of CO 2 captured from the main sources of CO 2 is injected into deep underground layers for long-term storage. The most capacious of these storage sites are saline aquifers. The capacity and safety of these storage sites...

Plate anchors are commonly used in mooring systems of offshore facilities for gas and oil production in deep and ultra-deep water. They may encounter hydrate-bearing sediments widespread in marine continental margins. The pullout capacity of square anchors embedded shallowly in a hydrate-bearing sand is investigated with small-scale model tests usi...

The Permeable block pavement is one of the representative Low Impact Development (LID) techniques for innovative water management based on systems that can infiltrate usually over the surface. The material of each layer in permeable block pavements is often comprised of a granular material with very high porosity not like conventional pavements. Ho...

During methane gas production from hydrate bearing sandy sediments, fine particles can migrate or clog the pores of sediments. Fines clogging induces a change in pressure gradient which affects the gas flow pattern and might induce gas driven fracture. A fundamental understanding of these phenomena is needed to enhance gas production strategies. Ef...

Science of Carbon Storage in Deep Saline Formations: Process Coupling across Time and Spatial Scales summarizes state-of-the-art research, emphasizing how the coupling of physical and chemical processes as subsurface systems re-equilibrate during and after the injection of CO2. In addition, it addresses, in an easy-to-follow way, the lack of knowle...

Production of methane from hydrate-bearing sediments requires hydrate dissociation for releasing mobile methane gas in sediments prior to gas production operations. Fines may migrate through or clog the pore space of sandy sediments depending on the geometry and topology of the pore space. Multiphase flow experiments were conducted on brine saturat...

Author's copy of chapter 17.

This paper develops a new low-cost construction material made of pH-adjusted fluorogypsum, class C fly ash, and type II Portland cement. The proposed fluorogypsum-based blend is durable in water and has a lower weight and lower cost than ordinary concrete. A preliminary investigation of strength and durability properties of this new construction ma...

The sulfate release from solidified/stabilized fluorogypsum was measured to develop the effective diffusion coefficients (De) as a parameter to assess the dissolution potential in aquatic applications. Specimens from 11 compositions consisting of 60-90% pH-adjusted fluorogypsum (pFG), 2-10% Type I/II portland cement (PC), and 0-38% Class C fly ash...

Fine-grained particles (fines) commonly coexist with coarse-grained sediments that host gas hydrate. These fines can be mobilized by liquid and gas flow during gas hydrate production. Once mobilized, fines can clog pore throats and reduce reservoir permeability. Even where particle sizes are smaller than pore-throat sizes, clogs can form due to clu...

The use of permeable block pavement has been acknowledged as one of the promising Low Impact Development (LID) strategies to mitigate the harmful effects of depletion of natural surfaces, due to the uncontrollable development of infrastructure and buildings. Numerous studies, associated with drainage properties and long-term performance of this tra...

Fines, defined here as grains or particles, less than 75 μm in diameter, exist nearly ubiquitously in natural sediment, even those classified as coarse. Macroscopic sediment properties, such as compressibility, which relates applied effective stress to the resulting sediment deformation, depend on the fabric of fines. Unlike coarse grains, fines ha...

Geological CO 2 sequestration has been proposed as an effective solution to mitigate excessive human-emitted CO 2 in atmosphere. Knowledge of immiscible two-phase flow of CO 2-water/brine is necessary to evaluate the efficiency and safety of geological storage sites. Among forces dominating fluid flow, capillary pressure is highly important because...

Fine particles within porous media may migrate with the flowing fluid and cause bridging or clogging in the pore space. Bridging and clogging reduce the flow permeability of porous media, which has a significant influence on petroleum engineering applications such as water and oil extraction, sand production, and gas production from hydrate-bearing...

Tempe cell with a self-developed horizontal hanging column attachment was used to measure the soil water characteristic curves (SWCCs) of granular materials initially saturated with either water or polymer solutions. For SWCCs of six poorly graded granular materials with d50 ranging from 0.04 to 0.7 mm in water, it was found that (1) as grain size...

Methane hydrate is considered a potential energy source, with worldwide reserves on the order of 500–10,000 Gt of carbon. The production of Methane from hydratebearing sediments requires hydrate dissociation for releasing mobile methane gas in sediments prior to gas production operation. Existence of even a small fraction of fines can greatly decre...

The structure of natural hydrate-bearing sediments that exist offshore or onshore is a combination of coarse-grained sediments and fine-grained particles. During gas production from hydrate-bearing sediments, fine particles may migrate with the flowing fluids within pore space and cause clogging of the pore space of the porous media. Therefore, fin...

The pore-level two-phase fluids flow mechanism needs to be understood for geological CO2 sequestration as a solution to mitigate anthropogenic emission of carbon dioxide. Capillary pressure at the interface of water–CO2 influences CO2 injectability, capacity, and safety of the storage system. Wettability usually measured by contact angle is always...

The physical properties of granular materials (such as hydraulic, strength, and thermal properties) are largely dependent on their density (or porosity) and particle size distribution. In infrastructure design, the thermal properties of soils are now more important than in the past. However, our understanding of the thermal properties of mixed gran...

A fuzzy algorithm, the Takagi–Sugeno model, is implemented to develop a fuzzy inference system for predicting the holding capacity of suction caisson foundations for offshore platforms. The premise parameters of the fuzzy model are optimized by using a subtractive clustering algorithm. The consequent parameters are optimally determined via a weight...

Sand improvements using organic agents have shown promising results. Polyacrylamide is one possible organic agent, which has been shown to influence the shear strength, stiffness, soil remediation, and erosion resistance of geomaterials. In this study, we explored the shear wave velocity (S-wave) and water retention curves of unsaturated sands cont...

The physical properties of granular materials, such as hydraulic, strength, and thermal properties, are dependent on the density (or porosity) and particle size distribution of materials. Among others, the understanding in thermal properties of granular materials is still in immature stage. In this study, the thermal conductivity, one of important...

Biopolymers have been employed in many soil applications, such as oil-contaminated soil remediation, due to their environmentally friendly characteristics. This study focused on changes in the wettability and viscosity of polyethylene oxide (PEO) and sodium alginate (SA), according to the variation in concentration and their impact on oil-contamina...

The performance of a geologic carbon storage site strongly depends on the capillary pressure of sealing rock and formations. While wettability of minerals is a key factor in capillary pressure, published contact angles are inconsistent. This study explores the discrepancy of published contact angles in order to reduce the uncertainty of measured la...

Mostly disposed without treatment, fly and biomass ashes have been a challenge that threatens the environment. To use them as geoenvironmental materials for thermal insulating purposes, a fundamental studying of thermal property of the pure ashes is crucial. In this study, thermal conductivities of fly (class C and F) and biomass ashes (sugarcane b...

Capillary pressure-water saturation relations are required to explore the CO 2 /brine flows in deep saline aquifers including storage capacity, relative permeability of CO 2 /brine, and change to stiffness and volume. The study on capillary pressure-water saturation curves has been conducted through experimentation and theoretical models. The resul...

Based on an extensive in situ shear-wave velocity (Vs) database, this study aims to not only examine the stress-dependent characteristics of in situ Vs from a generalized Vs-stress model [Vs=α×(σc')β], but also provide valuable reference information on site-specific stress-dependency of Vs for global geotechnical sites. For in situ Vs, the site-spe...

This paper presents the numerical simulation of pile installation and the subsequent increase in the pile capacity over time (or setup) after installation that was performed using the finite element software Abaqus. In the first part, pile installation and the following load tests were simulated numerically using the volumetric cavity expansion con...

Intermittent availability of renewable energy sources requires an energy storage system, and small-scale compressed air energy storage (CAES) has been brought up as an attractive option to store excess energy as a pressurized air. Here, we explore the idea of using a close-end steel pile as a vessel to store pressurized air. Small-scale CAES pile i...

The rapid growth of energy demands in China surpasses the progress of introducing new clean energy sources. China has relied upon fossil fuel for several decades, which caused China to produce the largest CO2 emission and to influence climate change in the world. Thus, China’s fossil fuel-dependent power sector needs to reduce CO2 emission. Carbon...

Recent developments using organic agents for soil improvement have shown promising results. Among the organic agents, polyacrylamide (PAM) has been considered to have a good impact on irrigation for increased water infiltration due to the capacity of PAM to absorb and store substantial amounts of water. In this study the authors explored the soil-w...

Biopolymers have shown a great effect in enhanced oil recovery because of the improvement of water-flood performance bymobility control, as well as having been considered for oil contaminated-soil remediation thanks to their mobility control and water-flood performance. This study focused on the wettability analysis of biopolymers such as chitosan...

The competence of geological carbon sequestration to a large extent relies on the short-term injection efficiency and the long-term capillary trapping and geological stability. This study uses a high-pressure micromodel and pore network simulation to investigate pore-scale displacement phenomena during the injection of supercritical carbon dioxide...

Biopolymers are viewed as effective and eco-friendly agents in soil modification. This study focuses on the wettability analysis of polyacrylamide (PAM) solutions for soil remediation. The contact angle, surface tension, and viscosity of PAM solutions were experimentally evaluated in air- and decane-biopolymer solution systems. Furthermore, a micro...

Biomass has become one of major sources of renewable energy, but, after combution, the ashes of biomass are not well recycled. The compressibility and thermal characteristics of biomass ashes were experimentally analyzed and compared to silica sand, in attempt to utilize the biomass ashes as sustainable construction material. The mean particle size...

Biomasses are organic materials that are derived from any living or recently-living structure. Plenty of biomasses are produced nationwide. Biomasses are mostly combusted and usually discarded or disposed of without treatment as biomass ashes, which include wood and sugarcane bagasse ashes. Thus, recycling or treatment of biomass ashes leads to uti...