scholarly journals Swelling-Pressure and Hydraulic Conductivity of Compacted Clays Focusing on the Clay-Mineral Type

2021 ◽  
Vol 70 (3) ◽  
pp. 272-278
Author(s):  
Masanori KOHNO
Keyword(s):  
Hydraulic Conductivity ◽  
Clay Mineral ◽  
Swelling Pressure ◽  
Compacted Clays ◽  
Mineral Type

scholarly journals Effects of clay-mineral type and content on the hydraulic conductivity of bentonite–sand mixtures made of Kunigel bentonite from Japan

Clay Minerals ◽  
2018 ◽  
Vol 53 (4) ◽  
pp. 721-732 ◽  
Author(s):  
Masanori Kohno ◽  
Yoshitaka Nara ◽  
Masaji Kato ◽  
Tsuyoshi Nishimura
Keyword(s):  
Hydraulic Conductivity ◽  
Clay Mineral ◽  
Swelling Pressure ◽  
Mineralogical Composition ◽  
Radioactive Waste Disposal ◽  
One Dimensional ◽  
Swelling Characteristics ◽  
Mineral Mixtures ◽  
Mineral Type

ABSTRACTClay-mineral type and content, bulk mineralogical composition and alteration of bentonite are very important factors for the ultra-long-term stabilization of barriers and backfills in radioactive waste disposal. This study investigates the effects of clay-mineral type and content on the swelling characteristics and permeability of bentonite–sand mixtures with clay minerals using one-dimensional swelling-pressure and constant-pressure permeability tests. The hydraulic conductivity of bentonite–sand–clay mineral mixtures increased with increasing content of non-swelling alteration products of montmorillonite. Furthermore, hydraulic conductivity was comparable to that determined with the Kozeny–Carman equation for a specific surface area, suggesting that hydraulic conductivity may be estimated based on the abundance of expected alteration products of montmorillonite. This study provides a basis for evaluation of the hydraulic conductivity of bentonite–sand mixtures with known quantities of expected alteration products of montmorillonite.

scholarly journals Effects of Hydraulic Gradient and Clay Type on Permeability of Clay Mineral Materials

Minerals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1064
Author(s):  
Masanori Kohno
Keyword(s):  
Hydraulic Conductivity ◽  
Specific Surface ◽  
Surface Area ◽  
Clay Mineral ◽  
Specific Surface Area ◽  
Hydraulic Gradient ◽  
Consistency Index ◽  
Hydrogen Energy ◽  
The Difference ◽  
Mineral Type

Considering the relevance of clay mineral-bearing geomaterials in landslide/mass movement hazard assessment, various engineering projects for resource development, and stability evaluation of underground space utilization, it is important to understand the permeability of these clay mineral-based geomaterials. However, only a few quantitative data have been reported to date regarding the effects of the clay mineral type and hydraulic gradient on the permeability of clay mineral materials. This study was conducted to investigate the permeability of clay mineral materials based on the clay mineral type, under different hydraulic gradient conditions, through a constant-pressure permeability test. Comparative tests have revealed that the difference in the types of clay mineral influences the swelling pressure and hydraulic conductivity. In addition, it has been found that the difference in water pressure (hydraulic gradient) affects the hydraulic conductivity of clay mineral materials. The hydraulic conductivity has been found to be closely associated with the specific surface area of the clay mineral material. Furthermore, the hydraulic conductivity value measured is almost consistent with the value calculated theoretically using the Kozeny–Carman equation. Moreover, the hydraulic conductivity is also found to be closely associated with the hydrogen energy, calculated from the consistency index of clay. This result suggests that the hydraulic conductivity of clay mineral materials can be estimated based on the specific surface area and void ratio, or consistency index of clay.

Hydraulic conductivity and removal rate of compacted clays permeated with landfill leachate

2013 ◽  
Vol 51 (31-33) ◽  
pp. 6148-6157 ◽  
Author(s):  
Mehmet Sukru Ozcoban ◽  
Nejat Cetinkaya ◽  
Suna Ozden Celik ◽  
Guler Turkoglu Demirkol ◽  
Vildan Cansiz ◽  
...  
Keyword(s):  
Hydraulic Conductivity ◽  
Landfill Leachate ◽  
Removal Rate ◽  
Compacted Clays

Mo or W catalysts promoted with Ni or Co supported on modified bentonite for decane hydroconversion

2020 ◽  
Vol 44 (7) ◽  
pp. 2966-2979
Author(s):  
Jahaziel Amaya ◽  
Natalia Suarez ◽  
Andrés Moreno ◽  
Sonia Moreno ◽  
Rafael Molina
Keyword(s):  
Clay Mineral ◽  
Bifunctional Catalysts ◽  
Modified Bentonite ◽  
Acid Properties ◽  
Mineral Type ◽  
Subsequent Incorporation

A clay mineral-type modified bentonite, produced via delamination and subsequent incorporation of AlZr and AlCe species to modulate their acid properties, was used to obtain bifunctional catalysts with the incorporation of NiMo, CoMo, NiW and CoW.

Remarks on the design of clay liners used in lagoons as hydraulic barriers

1992 ◽  
Vol 29 (3) ◽  
pp. 512-515 ◽  
Author(s):  
S. Leroueil ◽  
J. P. Le Bihan ◽  
R. Bouchard
Keyword(s):  
Hydraulic Conductivity ◽  
Key Words ◽  
Water Content ◽  
Compacted Clay ◽  
Plastic Limit ◽  
Clay Liners ◽  
Natural Soils ◽  
Compacted Clay Liner ◽  
Compacted Clays ◽  
Hydraulic Barriers

Considering that (i) the hydraulic conductivity of compacted clays is smaller on the wet side of optimum; (ii) the plastic limit is the water content below which the soil develops fissures under small stresses; (iii) the plastic limit and the optimum standard Proctor water content are similar for many natural soils; and (iv) the strength of compacted clays, thus the limit of trafficability, is a function of (w – wopt)/Ip, relevant conditions for the design of clay liners and the evaluation of their hydraulic conductivity are proposed. Key words : compacted clay, liner, hydraulic conductivity, strength, design.

Swelling pressure and hydraulic conductivity of compacted GMZ01 bentonite under salinization–desalinization cycle conditions

2015 ◽  
Vol 114 ◽  
pp. 454-460 ◽  
Author(s):  
Yong-Gui Chen ◽  
Chun-Min Zhu ◽  
Wei-Min Ye ◽  
Yu-Jun Cui ◽  
Qiong Wang
Keyword(s):  
Hydraulic Conductivity ◽  
Swelling Pressure ◽  
Gmz01 Bentonite

Modeling Hydraulic Conductivity and Swelling Pressure of Several Kinds of Bentonites Affected by Salinity of Water

2010 ◽  
Author(s):  
Yukihisa Tanaka ◽  
Takuma Hasegawa ◽  
Kunihiko Nakamura
Keyword(s):  
Hydraulic Conductivity ◽  
Radioactive Waste ◽  
Ground Water ◽  
Quantitative Evaluation ◽  
Coastal Area ◽  
Evaluation Method ◽  
Saline Water ◽  
Swelling Pressure ◽  
Compacted Bentonite ◽  
Swelling Characteristics

In case of construction of repository for radioactive waste near the coastal area, the effect of salinity of water on hydraulic conductivity as well as swelling pressure of bentonite as an engineered barrier should be considered because it is known that the hydraulic conductivity of bentonite increases and swelling pressure decreases with increasing salinity of water. Though the effect of salinity of water on hydraulic conductivity and swelling pressure of bentonite has been investigated experimentally, it is necessary to elucidate and to model the mechanism of the phenomenon because various kinds of bentonites may possibly be placed in various salinities of ground water. Thus, in this study, a model for evaluating hydraulic conductivity as well as swelling pressure of compacted bentonite is proposed considering the effect of salinity of water as follows: a) Change in number of flakes of a stack of montmorillonite because of cohesion. b) Change in viscosity of water in interlayer between flakes of montmorillonite. Quantitative evaluation method for hydraulic conductivity and swelling characteristics of several kinds of bentonites under saline water is proposed based on the model mentioned above.

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