Influence of temperature on the swelling pressure of bentonite clay

Akinwunmi, Bukunmi; Sun, Linlin; Hirvi, Janne T.; Kasa, Seppo; Pakkanen, Tapani A.

doi:10.1016/j.chemphys.2018.09.009

Cited by 36 publications

(16 citation statements)

References 41 publications

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“…For having a better understanding of behavior of the host medium (mainly clayey soils and clay stones) toward thermal load induced from the waste especially in long-term during thousands of years, many small-scaled and field-scaled experiments as well as numerical modeling and simulations have been done by researchers [16][17][18][19]. Akinwunmi et al [20] studied the behavior of bentonite toward temperature change since generally bentonite is used as barrier for HLW disposals. For instance, in [20], disposal area is located in Finland 400 m below the ground.…”

Section: Introductionmentioning

confidence: 99%

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A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

Hoseinimighani

Szendefy

2021

Period. Polytech. Civil Eng.

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Temperature change in soils and its possible effects date back to 20th century where temperature difference between laboratory and field for sampling made researchers interested in this topic. Due to development of technology and industry nowadays, new engineering applications such as nuclear waste disposal, oil extraction and pipelines, geothermal structures etc. have turned temperature change in soils to one of the high trending research topics where suitable knowledge of thermal effects on soils is required. For this purpose, it is tried at first to highlight the importance of temperature effect on geotechnical design by some examples and possible effect of temperature change on mechanical properties of fine soils are reviewed afterward. Investigation on results from literature proved that temperature change could alter some strength and consolidation parameters of fine soils. Different factors are proposed to be responsible for such thermally induced changes in mechanical parameters, however, existing explanations and comments from literature are diverse and not fully understood yet. In order to fill this gap, it is tried to find connections between different mechanical parameters and their behavior toward temperature change and possibly find a unified approach and factor to explain the mechanism responsible for thermally induced changes in mechanical parameters of fine soils. Finally, at the end, it is concluded that effect of temperature on structural rearrangement of solid particles could be a promising factor to connect the responses of different mechanical parameters toward temperature change.

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Section: Introductionmentioning

confidence: 99%

“…Akinwunmi et al [20] studied the behavior of bentonite toward temperature change since generally bentonite is used as barrier for HLW disposals. For instance, in [20], disposal area is located in Finland 400 m below the ground.…”

Section: Introductionmentioning

confidence: 99%

A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

Hoseinimighani

Szendefy

2021

Period. Polytech. Civil Eng.

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“…Their results showed that the monolayer hydrate was more stable than the bilayer hydrate at a burial depth of 7.0 km, and with burial depth increased, the basal spacing of the monolayer and bilayer hydrates changed to varying degrees [26]. In addition, Akinwunmi et al studied the swelling behavior of Na-MT and found that the swelling pressure appeared rapidly due to the temperature rising [27], however, Peng et al found that it was the exchangeable cations that provided the dominant driving force for MT to swell through a molecular dynamic study [28].…”

Section: Introductionmentioning

confidence: 99%

Effect of Crystal Chemistry Properties on the Distribution Characteristics of H2O and Na+ in Na-Montmorillonite Interlayer Space: Molecular Dynamics Simulation Study

et al. 2020

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At monolayer hydration state, the spatial distribution of H2O and Na+ in the interlayer of Na-montmorillonite (Na-MT) with different crystal chemistry properties was investigated by the molecular dynamics simulation method. The simulation results show that when layer charge density increases, H2O will move and form hydrogen bonds with O in tetrahedral surfaces (Ot) at a distance of 1.676 ± 0.043 Å. The impact of isomorphic substitution on the relative concentration of H2O depends largely on the layer charge density of Na-MT, when layer charge density is high, H2O move obviously to both sides of Na-MT sheets with the increase of octahedral substitution ratio. Nevertheless, Na+ coordinate with Ot at a distance of 2.38 Å, and the effect of isomorphic substitution ratio on the diffusion of Na+ is opposite to that of H2O. The mobility of both H2O and Na+ decreases with the increase of layer charge density or tetrahedral substitution ratio. The radial distribution function of Na-Ow (O in H2O) shows that the coordination strength between Na+ and Ow decreases with the increase of layer charge density or tetrahedral substitution ratio, and Na+ are hydrated by four H2O at a Van der Waals radius of 2.386 ± 0.004 Å. The research results can provide a theoretical basis for the efficient application of Na-MT at the molecular and atomic levels.

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“…4 Shale's volumetric changes (swelling) when it was exposed to NaCl solution of 5% w/w concentration at 25 C, 50 C and 90 C.It can be seen from Fig.4that shale swelled when it interacted with 5% w/w NaCl solution at all temperatures. Shale swelling may be attributed to osmotic flow of water into shale by chemical osmosis and activation of clay sites by temperature[22][23][24][25]. The swelling of shale could be partially attributed to osmotic flow of water into shale since the water activity of shale (aw = 0.96) is less than that of 5% w/w NaCl solution (aw = 0.97).…”

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confidence: 99%

A critical examination of diffuse double layer alterations in clay-electrolyte systems at elevated temperatures

Al-Bazali

2022

Preprint

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The objective of this work was to explore the impact of temperature on shale swelling and explain it in terms of diffuse double layer mechanics; Debye Hückel length alterations. This was made possible through the use of our newly developed thermo linear swelling test. Moreover, combined impact of temperature, dielectric constant of water and ionic strength (ionic concentration) of salt solutions on Debye Hückel length and resultant shale swelling and shrinkage was investigated. For dilute solutions, results showed that the product of temperature and dielectric constant of water (T*er) remained near constant for a wide range of temperature (25C – 90C). When shale interacted with 12% and 20% w/w NaCl and CaCl2 solutions, the % change in shale shrinkage as temperature incrementally increased from 25C to 90C is quite large and cannot be neglected. Results suggests that dielectric constant of water may have been reduced by both temperature and ionic strength of solution, all of which caused a greater reduction in Debye Hückel length and subsequent shale shrinkage. As for saturated NaCl and CaCl2 solutions, shale exhibited swelling behavior at moderate temperatures (up to 50C for NaCl and up to 70C for CaCl2) followed by shale shrinkage thereafter. This could be attributed to the development of repulsive forces between alike ions with diffuse double layer which may have overcome their electrostatic screening effect on charged clay surfaces. At higher temperatures, the contribution of dielectric constant of water on lowering Debye Hückel length may have soften the repulsion action produced by ions.

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Influence of temperature on the swelling pressure of bentonite clay

Cited by 36 publications

References 41 publications

A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

A Review on Effect of Temperature Change on Mechanical Parameters of Fine Soils

Effect of Crystal Chemistry Properties on the Distribution Characteristics of H2O and Na+ in Na-Montmorillonite Interlayer Space: Molecular Dynamics Simulation Study

A critical examination of diffuse double layer alterations in clay-electrolyte systems at elevated temperatures

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