Investigating the swelling pressure of highly compacted bentonite/sand mixtures under constant-volume conditions

Zeng, Zhixiong; Cui, Yu‐Jun; Talandier, Jean

doi:10.1007/s11440-021-01352-0

Cited by 9 publications

(2 citation statements)

References 29 publications

(38 reference statements)

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“…7a. During the hydration, the clay minerals in the bentonite/claystone mixtures, such as smectite, swelled and formed a matrix, while the inert minerals, such as quartz and feldspar, constituted the inclusion and were dispersed in the matrix [37]. Since the quartz and feldspar were generally nonporous, the inter-particle pores existed in the matrix and the obtained inter-particle distance represented the property of the matrix.…”

Section: Inter-particle Distance and Its Relationship To Swelling Pre...mentioning

confidence: 99%

Evaluation of swelling pressure of bentonite/claystone mixtures from pore size distribution

2022

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The swelling behaviour of expansive clays is strongly related to the interaction between clay particles. In this paper, a series of constant-volume swelling pressure and mercury intrusion porosimetry (MIP) tests were carried out on MX80 bentonite/Callovo-Oxfordian (COx) claystone mixtures with different bentonite fractions and dry densities. Results show that the swelling pressure increased linearly with the increase of dry density. Additionally, at a given dry density, the larger the bentonite fraction, the larger the swelling pressure. From the MIP results, the inter-particle pore volume decreased with the increases of bentonite fraction and dry density.To link the macroscopic swelling behaviour with the microstructure features, a new method was proposed, allowing the determination of the average inter-particle distance from the pore size distribution. Moreover, a linear relationship was identified between the swelling pressure and the average inter-particle distance in a semi-logarithmic plane, regardless of the bentonite fraction and montmorillonite content.

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Section: Inter-particle Distance and Its Relationship To Swelling Pre...mentioning

confidence: 99%

Evaluation of swelling pressure of bentonite/claystone mixtures from pore size distribution

2022

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“…The bentonite barriers encapsulate waste canisters in host rock deposits and provide major containment or buffering against radionuclide migration. Its high swelling property, low permeability, high sorption capacity and good self-sealing characteristics [5,10,23,27,28,43] make it an ideal buffer material. Safety and structural integrity of a repository largely depends on the performance of bentonite barriers [33].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of gas migration behaviour in saturated bentonite with consideration of temperature

Cui,

Masum,

et al. 2024

Acta Geotech.

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Gas migration behaviour in saturated, compacted bentonite, especially under rigid-boundary conditions, is controversial. Gas breakthrough phenomena, observed under higher pressure gradient conditions in laboratory experiments, are described in literatures by adopting visco-capillary or dilatancy-controlled flow concept. Since, under rigid-boundary conditions, volumetric expansion is restricted and/or water dissipation is not detected, these concepts cannot be implemented satisfactorily. Instead, a diffusion and solubility-controlled (DSC) flow concept was previously found to be adequate for describing the behaviours at lower temperatures (20 °C). The DSC concept describes gas breakthrough as a function of gas solubility. Breakthrough occurs when concentration of dissolved gas reaches or surpasses the solubility limit in the entire specimen. In this work, the DSC flow concept is applied to validate gas migration and breakthrough experiments conducted at higher temperatures, e.g. 40 and 60 °C. Good agreements are observed between the experimental and predicted results, suggesting that the DSC flow concept can be applied to describe gas migration behaviour satisfactorily in rigidly confined saturated bentonites (under constant volume conditions) for various temperature regimes. Results also show that helium dissolution and diffusion processes in saturated bentonite are sensitive to test temperature and pressure conditions. The processes become more stable with increasing gas injection pressure and ambient temperature.

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Bearing Capacity of a Footing on an Expansive Unsaturated Bentonite–Sand Mixture

Fattah,

Al-Lami,

Ayasrah

2023

Geotech Geol Eng

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Investigating the swelling pressure of highly compacted bentonite/sand mixtures under constant-volume conditions

Cited by 9 publications

References 29 publications

Evaluation of swelling pressure of bentonite/claystone mixtures from pore size distribution

Evaluation of swelling pressure of bentonite/claystone mixtures from pore size distribution

Numerical investigation of gas migration behaviour in saturated bentonite with consideration of temperature

Bearing Capacity of a Footing on an Expansive Unsaturated Bentonite–Sand Mixture

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