Article
Engineering, Geological
Yasutaka Watanabe, Shingo Yokoyama, Misato Shimbashi, Yoichi Yamamoto, Takahiro Goto
Summary: In order to understand the self-healing property of an engineered barrier for radioactive waste disposal, the hydraulic conductivity of compacted bentonite-sand mixtures saturated with artificial seawater (SW) was studied before and after gas migration. Gas was found to migrate through the entire cross-section of the specimen, with gas breakthrough occurring in the equilibrium swelling pressure range. The change in permeability after gas migration was within a limited range, suggesting that gas migration creates a pore structure that cannot be sealed via crystalline swelling of montmorillonite in SW.
JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING
(2023)
Article
Thermodynamics
Xiao-Yan Li, Heng-Qi Hu, Yi Wang, Xiao-Sen Li
Summary: This study investigated the effects of different mesh sizes of sand control screen on gas-liquid-sand production behavior during methane hydrate dissociation. The results showed that the use of sand control screen prevented sand migration and reduced sediment subsidence, but also decreased the gas production rate. The larger the mesh size of the sand control screen, the lower the sand production and the higher the flow resistance. The study provided guidance for selecting sand control screen and developing strategies for efficient gas hydrate production.
Article
Engineering, Environmental
Yu Feng, Yang Zhao, Yuze Han, Yanzhen Liu, Lunxiang Zhang, Jiafei Zhao, Lei Yang, Yongchen Song
Summary: The formation and dissociation behavior of CO2 hydrates in the presence of clay particles were investigated using low-field nuclear magnetic resonance. It was found that montmorillonite particles significantly promoted the conversion of water into hydrate, while illite particles had a weaker promoting effect. According to the DLVO theory, the total interaction potential between montmorillonite particles was much higher than that between illite particles.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Construction & Building Technology
Meitong Lv, Dingwen Zhang, Haoming Ren
Summary: The induced partial saturation (IPS) technique and microbial desaturation method are two methods used to mitigate sand liquefaction and protect the environment. This study focuses on the real-time monitoring and quantitative analysis of saturation during microbial bubble generation using shear wave velocity measurements and resistivity analysis. The results show that shear wave velocity and resistivity are effective indicators of saturation, and their relationships with saturation can be quantitatively established. This research has significant value for field trials and engineering applications of the microbial desaturation method.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Linlin Zhou, Shuaicheng Guo, Wenbo Ma, Fu Xu, Caijun Shi, Yong Yi, Deju Zhu
Summary: This study characterizes the engineering properties of coral coarse aggregate (CCA) and evaluates its potential utilization as an internal curing agent for high-strength seawater sea sand concrete (HS-SWSSC). The results show that CCA has open pores and can absorb and release water, which can enhance the properties of HS-SWSSC. The study also reveals the optimal CCA content for internal curing in HS-SWSSC.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Geological
Md Farhad Hasan, Hossam Abuel-Naga, E-C Leong
Summary: An electrical resistivity/conductivity model was proposed for isotropic saturated sand/clay mixture, and validated through laboratory experiments, achieving good agreement between model predictions and experimental measurements.
ENGINEERING GEOLOGY
(2021)
Article
Thermodynamics
Bhavikkumar Mahant, Omkar Singh Kushwaha, Rajnish Kumar
Summary: This study reports the synthesis and application of a surfactant derived from Cocos nucifera (CDS) for methane gas hydrate formation. The CDS surfactant showed competitive growth of methane gas hydrates and proved to be a promising substitute for kinetic promotion. Morphology studies and property evaluations were conducted to comprehensively evaluate the synthesized surfactant.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Environmental
Byeonggwan Lee, Kyuchul Shin, Sanehiro Muromachi, Igor L. Moudrakovski, Christopher I. Ratcliffe, John A. Ripmeester
Summary: Antifreezes such as methanol and ammonia can enhance methane storage in binary clathrate hydrates like THF and TBAB. Methanol acts as a catalyst for methane hydrate formation and induces TBAB hydrates to form an orthorhombic structure suitable for methane storage. These findings suggest that methanol could play a crucial role in hydrate-based methane storage systems.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Evgeny Chuvilin, Valentina Ekimova, Dinara Davletshina, Boris Bukhanov, Ekaterina Krivokhat
Summary: Permafrost composed of sand with silt and clay components may store stable and metastable gas hydrates, which can lose stability under dissolved salts. The effect of silt and clay percentage and mineralogy on salt and water transport and gas hydrate dissociation in frozen sand is studied in laboratory experiments. Sediments with higher clay percentages show slower salt migration and higher critical salt concentration, while salt migration is slower in sand with montmorillonite and faster in sand with higher silt contents.
Article
Engineering, Environmental
Zhiqiang Dong, Zheng Chen, Junnan Rui, Weiying Li, Yuping Qiu
Summary: This study found that the binding modes between graphene oxides (GO) of different sizes and terrigenous nanoplastics (NP) vary, resulting in different impacts on the mobility of NP in marine sedimentary environment. The size of GO also affects the salinity-dependent mobility of NP.
Article
Computer Science, Interdisciplinary Applications
Joaquin Liaudat, Anne-Catherine Dieudonne, Philip J. Vardon
Summary: Geological Disposal Facilities (GDF) for radioactive waste often use clay-rich materials as the geological formation and/or engineered barrier. Gas generated within the GDF can create significant pressure and cause gas migration through clay materials using various transport mechanisms. This study presents a new Pneumo-Hydro-Mechanical (PHM) Finite Element model to simulate gas migration in saturated clay samples at a small scale.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Chemistry, Physical
Asheesh Kumar, Hari Prakash Veluswamy, Sanat Kumar, Rajnish Kumar, Praveen Linga
Summary: Clathrate hydrate-based sustainable technologies, such as solidified natural gas (SNG) technology, show great potential for storing natural gas. Experiments on mixed hydrates in a seawater environment reveal the promotional effect of seawater on hydrate formation and suggest the economic feasibility of using natural seawater to enhance SNG technology.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Energy & Fuels
Yue Ma, Qiang Gao, Jian Guan, Chi Zhang, Jianzhong Zhao
Summary: In this study, experiments were conducted to dissociate mixed CO2 + CH4 hydrates by depressurization and thermal stimulation. The kinetics, fluid production behavior, heat transfer characteristics, and separation factors were examined during the hydrate formation and dissociation processes. The results showed consistent gas consumption and phase saturation, with a stochastic induction time ranging from 38 to 58 minutes. The hydrate exhibited a strong selectivity to CH4 during the gas mixture hydrate formation process, and the gas production increased with decreasing depressurization pressure.
Article
Geochemistry & Geophysics
J. A. Priest, M. Abbas, J. L. Hayley
Summary: Laboratory tests on gas-saturated hydrate-bearing sand specimens showed that the formation of hydrate led to significant increases in stiffness and strength of the sand. Water saturation subsequently resulted in a reduction of around 90% in stiffness and 70% in strength. The changes in behavior were attributed to the dissociation and dissolution of the hydrate, with remaining hydrate acting as more of a pore filler.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Construction & Building Technology
Zhongyu Lu, Genghao Liu, Yifan Wu, Meiling Dai, Mingchao Jiang, Jianhe Xie
Summary: Recycled coarse aggregate (RCA), seawater, and sea sand can be combined to create a new green building material. In this study, mineral admixtures were added to improve the properties of recycled aggregate-seawater-sea sand concrete (RASSC). The durability of RASSC was studied after immersion in artificial seawater, and the results showed that mineral admixtures had a significant impact on the compressive strength and flexural properties of RASSC. As immersion time increased, the RASSC became more brittle and its failure mode changed.
JOURNAL OF BUILDING ENGINEERING
(2023)
