Thermal properties of GMZ bentonite pellet mixtures subjected to different temperatures for high-level radioactive waste repository

Xu, Yunshan; Zhou, Xiangyun; Li, Jingpei; Zeng, Zhaotian

doi:10.1007/s11440-021-01244-3

Cited by 36 publications

(7 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Over the past decades, much research have explored the thermal properties of various types of bentonite. Related experiments can be found in the works of Madsen (1998) and Dixon (2019) on MX80 bentonite [9,10], suggesting that thermal properties can be affected by material source, texture, and dry density, Villar (2000) and Rutqvist (2020) on Febex bentonite, proposing that the thermal conductivity is linearly dependent on saturation in the numerical model [11,12], Ould-Lahoucine et al (2002) and Huang (2020) on Kunigel-V1 bentonite [13,14], which does not behave very differently from MX80 in terms of the moisture distribution and heat transfer characteristics with the same boundary conditions assumed in the simulation model, Chen and Huang (2004) on ZH-clay which is found to be a temperature-sensitive Ca-bentonite produced in Taiwan [15], Ye et al (2010) and Xu et al (2021) on GMZ bentonite, drawing the conclusions that thermal conductivity increased with increasing temperature, and the different pore-size distribution can influence the conductive heat transfer [16,17], and Cho et al (2008) and Yoon (2019) on Kyeongju bentonite, describing the thermal conductivity of compacted bentonite as a function of water fraction at each dry density [18,19]. Additionally, there are research indicating that soil thermal conductivity is strongly affected by soil structure and chemical composition [20,21].…”

Section: Introductionmentioning

confidence: 80%

Experimental Study on the Thermal Conductivity of Compacted SPV200 Bentonite

et al. 2022

View full text Add to dashboard Cite

This study employed two thermal conductivity measuring techniques, including the needle probe-based transient needle-probe method in accordance with ASTM 5334-14 and the surface probe-based transient plane source method in compliance with ISO 22007-2:2015, to examine the thermal conductivity of compacted SPV200 bentonite. The effects of temperature, water content, and dry density on the thermal behavior of SPV200 bentonite were extensively investigated. The test results indicate: (1) thermal conductivity measured by the two methods agreed well, while the transient plane source method exhibited good efficiency; (2) the thermal conductivity of compacted SPV200 increases with water content, dry density, and temperature; (3) three-dimensional representations of the thermal conductivity of SPV200 bentonite as functions of dry density, water content, and temperature were generated to illustrate a clear relationship among them; (4) two multi-parameter models for predicting thermal conductivity of compacted SPV200 bentonite were proposed, and both showed good fits to the experimental data. The results provide a practical approach to the prediction of thermal properties of compacted bentonite, which can be helpful in the coupled thermo-hydro-mechanical analysis of buffer materials.

show abstract

Section: Introductionmentioning

confidence: 80%

Experimental Study on the Thermal Conductivity of Compacted SPV200 Bentonite

et al. 2022

View full text Add to dashboard Cite

show abstract

“…12,66,69 We also note that thermal strain is effective-stress dependent, and in particular, the thermal volumetric strain under high confining stress may occur as contractive rather than expansive because of the mechanical weakening of contacts. 13 Finally, we note that our simulations evaluate the thermal strain in undrained conditions and that additional processes related to osmotic 15,22,54,56,58,59,63,64 Experiments were performed using Kyeongju bentonite, 15 GMZ07 bentonite, 54 Kunigel V1 bentonite, 22 Gyeongju bentonite, 58 and MX-80 bentonite. 56,59,63,65 Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…Heat capacity of smectite and bentonite at T ≈ 298 K as a function of water mass fraction, with color representing dry density ρ d , including MD simulation predictions from this work (squares) and literature data. ,,− Results from Honorio and Brochard are based on MD simulations of perfectly ordered, infinite montmorillonite particles. Experiments were performed using pure water, dry Wyoming Na-montmorillonite, GMZ07 bentonite, BENESA bentonitic clay, Gyeongju bentonite, Wyoming bentonite, Volclay bentonite, , and Sardinian bentonite . Here and in the following figures, the confidence intervals on our MD simulation predictions, if not visible, are smaller than the symbol size.…”

Section: Resultsmentioning

confidence: 99%

“… 28 , 39 , 47 − 54 Results from Honorio and Brochard 39 are based on MD simulations of perfectly ordered, infinite montmorillonite particles. Experiments were performed using pure water, 53 dry Wyoming Na-montmorillonite, 52 GMZ07 bentonite, 54 BENESA bentonitic clay, 48 Gyeongju bentonite, 28 Wyoming bentonite, 49 Volclay bentonite, 50 , 51 and Sardinian bentonite. 47 Here and in the following figures, the confidence intervals on our MD simulation predictions, if not visible, are smaller than the symbol size.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Nanoscale Prediction of the Thermal, Mechanical, and Transport Properties of Hydrated Clay on 10⁶- and 10¹⁵-Fold Larger Length and Time Scales

Zheng,

Bourg

2023

ACS Nano

View full text Add to dashboard Cite

Coupled thermal, hydraulic, mechanical, and chemical (THMC) processes, such as desiccation-driven cracking or chemically driven fluid flow, significantly impact the performance of composite materials formed by fluid-mediated nanoparticle assembly, including energy storage materials, ordinary Portland cement, bioinorganic nanocomposites, liquid crystals, and engineered clay barriers used in the isolation of hazardous wastes. These couplings are particularly important in the isolation of high-level radioactive waste (HLRW), where heat generated by radioactive decay can drive the temperature up to at least 373 K in the engineered barrier. Here, we use large-scale all-atom molecular dynamics simulations of hydrated smectite clay nanoparticle assemblages to predict the fundamental THMC properties of hydrated compacted clay over a wide range of temperatures (up to 373 K) and dry densities relevant to HLRW management. Equilibrium simulations of clay–water mixtures at different hydration levels are analyzed to quantify material properties, including thermal conductivity, heat capacity, thermal expansion, suction, water and ion self-diffusivity, and hydraulic conductivity. Predictions are validated against experimental results for the properties of compacted bentonite clay. Our results demonstrate the feasibility of using atomistic-level simulations of assemblages of clay nanoparticles on scales of tens of nanometers and nanoseconds to infer the properties of compacted bentonite on scales of centimeters and days, a direct upscaling over 6 orders of magnitude in space and 15 orders of magnitude in time.

show abstract

“…Extensive research has been subsequently conducted to develop more sophisticated soil models with improved hardening rules based on the concepts of multi-surface and bounding surface plasticity [1,16,25,48,51,56,57,59]. Following the approach of Gens and Nova [20], the influence of structure can also be included within the critical-state based soil models [3,19,26,27,32,43,52,58]. A versatile extension to the non-associative anisotropic model, SANICLAY [17], was proposed by Taiebat et al [53] for modeling sensitive or structured clays with considerations of both isotropic and frictional destructuration.…”

mentioning

confidence: 99%

Undrained cavity expansion in anisotropic soils with isotropic and frictional destructuration

Chen

2021

Acta Geotech.

View full text Add to dashboard Cite

This paper proposes a semi-analytical solution of undrained cylindrical cavity expansion in anisotropic soils with both isotropic and frictional destructuration. The rigorous derivation based on the general form of the SANICLAY model with destructuration is provided following a standardized solving procedure, and the features of anisotropy and structuration are then invoked in the cavity expansion solution by adopting the non-associated hierarchical model. Cavity expansion tests in both structured and unstructured clays with various overconsolidation ratio are conducted to investigate the evolutions of effective stresses, excess pore pressure, anisotropic parameters and structuration factors during cylindrical expansion. The results show that the effective stresses at the cavity wall are lower after expansion and the cavity excess pore pressure is oppositely higher in structured clays with slightly smaller plastic regions. The evolutions of anisotropy for structured clays appear to follow similar patterns to unstructured cases, whereas the degree of anisotropy is further developed with gradual loss of inter-particle bonds. Finally, the proposed solution is applied to predict the limit pressure of pressuremeter tests in Bothkennar clay, showing its ability for interpretation of in situ testing data in natural structured clays.

show abstract

Thermal properties of GMZ bentonite pellet mixtures subjected to different temperatures for high-level radioactive waste repository

Cited by 36 publications

References 42 publications

Experimental Study on the Thermal Conductivity of Compacted SPV200 Bentonite

Experimental Study on the Thermal Conductivity of Compacted SPV200 Bentonite

Nanoscale Prediction of the Thermal, Mechanical, and Transport Properties of Hydrated Clay on 10⁶- and 10¹⁵-Fold Larger Length and Time Scales

Undrained cavity expansion in anisotropic soils with isotropic and frictional destructuration

Contact Info

Product

Resources

About

Thermal properties of GMZ bentonite pellet mixtures subjected to different temperatures for high-level radioactive waste repository

Cited by 36 publications

References 42 publications

Experimental Study on the Thermal Conductivity of Compacted SPV200 Bentonite

Experimental Study on the Thermal Conductivity of Compacted SPV200 Bentonite

Nanoscale Prediction of the Thermal, Mechanical, and Transport Properties of Hydrated Clay on 106- and 1015-Fold Larger Length and Time Scales

Undrained cavity expansion in anisotropic soils with isotropic and frictional destructuration

Contact Info

Product

Resources

About

Nanoscale Prediction of the Thermal, Mechanical, and Transport Properties of Hydrated Clay on 10⁶- and 10¹⁵-Fold Larger Length and Time Scales