On swelling behaviours of a bentonite under different water contents

Wang, Hailong; Ito, Dachi; Shirakawabe, Takumi; Ruan, Kunlin; Komine, Hideo

doi:10.1680/jgeot.21.00312

Cited by 19 publications

(4 citation statements)

References 41 publications

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“…The swelling pressure can be measured by different methods, but different test methods produce different swelling pressure values [9,11,12]. It should be emphasized that it is ideal to think of the swelling pressure as the pressure measured when bentonite is wetted under the condition of limited volume [13]. The constant volume method, constant load method, and paired swell test (PS-test) were proposed to measure the swelling pressure [14].…”

Section: Test Methods For Swelling Pressurementioning

confidence: 99%

Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

Liu

Yao

et al. 2023

Applied Sciences

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The swelling pressure of bentonite changes dramatically due to diffused nuclear radiation heat and underground osmosis, causing the failure of the buffer isolation layer in deep geological repositories for the disposal of high-level radioactive waste. A detailed overview of the relevant research results on the swelling pressure variation of bentonite under thermo-chemical effects is presented in this paper. The results showed that the values of the swelling pressure obtained by different test methods are dissimilar. The swelling pressure of bentonite decreased with the increasing pore solution concentration; nevertheless, the effect of temperature on the swelling pressure is still controversial. At the micro-level, crystal layer swelling and double- layer swelling are generally considered to be the main factors affecting the swelling pressure; the pore structure and water distribution of bentonite will change owing to thermo-chemical effects. At the macro-level, involving intergranular stress, a mechanical parameter was proposed to explain the mechanism of the changes in the swelling pressure of bentonite. Finally, future research directions for the study of the evolution of bentonite swelling properties under thermo-chemical effects are proposed, based on the current research results.

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Section: Test Methods For Swelling Pressurementioning

confidence: 99%

Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

Liu

Yao

et al. 2023

Applied Sciences

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“…Figure 2 shows the Mössbauer spectra (MS) of potassium hexaferrocyanide (1), bentonite (2), the complexes of potassium hexaferrocyanide (3) and copper hexaferrocyanide intercalated in bentonite (4), as well as the percolated complex P[AAm-AAc]:{BT-K (4−x) Cu x [Fe(CN) 6 ]} (5). The MS spectrum of potassium ferricyanide is a non-broadened singlet peak with a chemical shift of δ = −0.045 mm/s, which noticeably simplifies the analysis of gamma-spectra of the intercalated mineral and its percolated form in polymer matrix composition [26,27].…”

Section: Mössbauer Spectroscopymentioning

confidence: 99%

“…An important aspect is the controllability and predictability of the process of radionuclide sorption in the volume of a natural or synthetic matrix. The matrix materials should have acceptable physical parameters for application as structural backfill materials and the creation of artificial barriers in the construction of engineering structures [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Investigation of the Properties of Biphasic Hybrid Composites Based on Bentonite, Copper Hexacyanoferrate, Acrylamide and Acrylic Acid Hydrogel

2023

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This article presents a study of the synthesis and characterization of new biphasic hybrid composite materials consisting of intercalated complexes (ICC) of natural mineral bentonite with copper hexaferrocyanide (phase I), which are incorporated into the bulk of the polymer matrix (phase II). It has been established that the sequential modification of bentonite with copper hexaferrocyanide and introduction of acrylamide and acrylic acid cross-linked copolymers into its volume by means of in situ polymerization promote the formation of a heterogeneous porous structure in the resulting hybrid material. The sorption abilities of prepared hybrid composite toward radionuclides of liquid radioactive waste (LRW) have been studied, and the mechanism for binding radionuclide metal ions with the components of the hybrid composition have been described.

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“…The function of backfill materials is to form an impermeable zone around radioactive waste, since nuclear waste shall be kept separate from the environment. Backfill materials shall have swelling properties, since the swelling properties lead to development of impermeability in backfill materials [6,7].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Composite Materials for Immobilization of Radionuclides in Liquid Radioactive Waste

GК¹

2023

J Miner Sci Materials

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The biphasic hybrid composite materials for immobilization and fixation of radionuclides of the Liquid Radioactive Waste (LRW) of the research water-water reactor KIR WWR-K have been studied. It was found that the hybrid compositions have a high synergistic effect regard to the sorption of radionuclides, especially 137Cs+ and 134Cs+ . The distribution coefficient of cesium radionuclides in the composite materials are 2 times higher in comparison with the those sorption activity in the mineral matrix. It has been established that the sorption of radionuclides by two-phase hybrid compositions is carried out by a combination of three mechanisms. Firstly, due to the electrostatic binding reaction between the functional groups of sorbents and metal ions stabilized by the system of coordination bonds with electron-donating nitrogen and oxygen atoms of the amino and carbonyl groups of the polymer matrix. Secondly, as a result of ion exchange between counterions of the mineral matrix and radionuclides ions in the environmental solution. Finally, due to the superequimolar absorption of radionuclides as a result of deformation of the crystal lattice of mineral fillers of the polymer matrix of bentonite and copper ferrocyanide, which increases their pore size. It has been shown that biphasic hybrid composite materials have an increased mechanical and radiation resistance while retaining elasticity even at high doses of electron irradiation, at which in despite on a noticeable decrease the value of deformation there is no significant decline in their compressive strength. The obtained information on the mechanism of binding of biphasic hybrid composite materials with various metal ions makes it possible to synthesize new classes of materials for selective sorption of certain types of radionuclides in the body of mineral and polymer matrices. This will allow us to use these materials as a highly effective sorption materials with a synergetic effect for the detection, identification, immobilization and fixation of LRW radionuclides.

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On swelling behaviours of a bentonite under different water contents

Cited by 19 publications

References 41 publications

Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

Research Progress on the Influence of Thermo-Chemical Effects on the Swelling Pressure of Bentonite

Synthesis and Investigation of the Properties of Biphasic Hybrid Composites Based on Bentonite, Copper Hexacyanoferrate, Acrylamide and Acrylic Acid Hydrogel

Hybrid Composite Materials for Immobilization of Radionuclides in Liquid Radioactive Waste

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