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Experimental study on shrinkage characteristics of compacted bentonite–sand mixtures

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Abstract

Bentonite–sand mixtures have been proposed as the potential engineered barrier materials because of their low permeability and strong sealing ability under hydrated repository conditions. However, the mixtures may gradually lose water and shrink, which could compromise the engineering integrity of the barrier, under the environmental conditions of the repository where there is a continuous release of radiant heat from nuclear waste. To investigate the shrinkage characteristics of compacted bentonite–sand mixtures, we carry out laboratory drying tests by preparing samples with varying initial dry densities, water contents, and sand contents. The fabric of sand particles is characterized through the quantitative analysis of micro-CT scanning results. Experimental results reveal that both initial compaction condition and sand content significantly influence the shrinkage behaviors of bentonite–sand mixtures. Both shrinkage strain and shrinkage coefficient of the specimens decrease with the increasing initial dry density and the decreasing initial water content. Generally, the development of suction during drying is responsible for the volume shrinkage. The shrinkage and water retention capacities reduce with the increasing sand content in the mixture. Moreover, micro-CT results reveal that, with higher amount of sand inclusions, the mixture presents higher sand particle contact density. When sand content exceeds 30%, these sand particles tend to form sand skeletons that provide high inter-particle friction forces and limit the further shrinkage of mixture. This study is expected to improve the basic understanding of the underlying shrinkage mechanisms of bentonite–sand mixtures and help guide the future design of nuclear waste repository.

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The authors confirm that the data supporting the findings of this study are available within the article and its supplementary materials.

References

  • Agus SS, Schanz T (2008) A method for predicting swelling pressure of compacted bentonites. Acta Geotech 3(2):125–127

    Article  Google Scholar 

  • Bilsel H, Iravanian A. (2009) Characterization of compacted sand-bentonite mixtures as landfill barriers in North CyprusIn. Proceedings of the 2nd international conference of new developments in soil mechanics and geotechnical engineering. North Cyprus: Near East University, pp 472–9

  • Cabalar AF, Hasan RA (2013) Compressional behaviour of various size/shape sand-clay mixtures with different pore fluids. Eng Geol 164:36–49

    Article  Google Scholar 

  • Cabalar AF, Mustafa WS (2015) Fall cone tests on clay-sand mixtures. Eng Geol 192:154–165

    Article  Google Scholar 

  • Chen YG, Sun Z, Cui YJ, Ye WM, Liu QH (2019) Effect of cement solutions on the swelling pressure of compacted GMZ bentonite at different temperatures. Constr Build Mater 229:116872

    Article  Google Scholar 

  • Cornelis WM, Corluy J, Medina H, Hartmann R, Van Meirvenne M, Ruiz ME (2006) A simplified parametric model to describe the magnitude and geometry of soil shrinkage. Eur J Soil Sci 57(2):258–268

    Article  Google Scholar 

  • Cui SL, Zhang HY, Zhang M (2012) Swelling characteristics of compacted GMZ bentonite-sand mixtures as a buffer/backfill material in China. Eng Geol 141:65–73

    Article  Google Scholar 

  • Dao MH, Liu QB, Wei H, Wei X, Wang ZH (2020) Study on desiccation -shrinkage characteristic and shrinkage cracking mechanism of bentonite and sand mixtures. Rock & Soil Mech 41:789–798 (in Chinese)

    Google Scholar 

  • Delage P, Howat MD, Cui YJ (1998) The relationship between suction and swelling properties in a heavily compacted unsaturated clay. Eng Geol 50(1–2):31–48

    Article  Google Scholar 

  • Delage P, Marcial D, Cui YJ, Ruiz X (2006) Ageing effects in a compacted bentonite: a Microstructure Approach. Géotechnique 56(5):291–304

    Article  Google Scholar 

  • Demdoum A, Gueddouda MK, Goual I, Souli H, Ghembaza MS (2020) Effect of landfill leachate on the hydromechanical behavior of bentonite-geomaterials mixture. Constr & Build Mater 234:117356

    Article  Google Scholar 

  • Demdoum A, Gueddouda MK, Goual I, Souli H, Anlauf R, Ghembaza MS (2021) Effect of water content on hydraulic properties of bentonite-geomaterials mixture. European Journal of Eur J Environ Civ En 25(13):2370–2395

    Article  Google Scholar 

  • Dixon DA, Gray MN, Thomas AW (1985) A study of the compaction properties of potential clay-sand buffer mixtures for use in nuclear fuel waste disposal. Eng Geol 21(3–4):247–255

    Article  Google Scholar 

  • Du JP, Zhou AN, Lin XS, Bu YH, Kodikara J (2020) Revealing expansion mechanism of cement-stabilized expansive soil with different interlayer cations through molecular dynamics simulations. J Phys Chem C 124(27):14672–14684

    Article  Google Scholar 

  • Du JP, Zhou AN, Lin XS, Bu YH, Kodikara J (2021) Prediction of swelling pressure of expansive soil using an improved molecular dynamics approach combining diffuse double layer theory. Appl Clay Sci 203:105998

    Article  Google Scholar 

  • Jia LY, Chen YG, Ye WM, Cui YJ (2019) Effects of a simulated gap on anisotropic swelling pressure of compacted GMZ bentonite. Eng Geol 248:155–163

    Article  Google Scholar 

  • Li SJ (2019) Study on swelling and shrinkage behavior of GMZ bentonite based buffer/backfill material. Master Thesis. Nanjing University, China, pp 56–59 (in Chinese)

  • Liu YM, Wen ZJ (2003) An investigation of the physical properties of clayey materials used in nuclear waste disposal at great depth. Miner Rocks 23:42–45

    Google Scholar 

  • Liu ZR, Cui YJ, Ye WM, Zhang Z, Wang Q, Chen B (2020) Investigation on vibration induced segregation behaviour of crushed GMZ bentonite pellet mixtures. Constr Build Mater 241:117949

    Article  Google Scholar 

  • Lloret A, Villar MV (2007) Advances on the knowledge of the thermo-hydro-mechanical behavior of heavily compacted FEBEX bentonite. Phys Chem Earth 32(8–14):701–715

    Article  Google Scholar 

  • Lu N, Likos WJ (2004) Unsaturated soil mechanics. John Wiley & Sons Inc

    Google Scholar 

  • Manca D (2015) Hydro-chemo-mechanical characterisation of sand/bentonite mixtures, with a focus on the water and gas transport properties. Ph.D. Thesis. École polytechnique fédérale de Lausanne, pp 22–27

  • Monkul MM, Ozden G (2007) Compressional behavior of clayey sand and transition fines content. Eng Geol 89(3–4):195–205

    Article  Google Scholar 

  • Naeini SA, Baziar MH (2004) Effect of fines content on steady-state strength of mixed and layered samples of a sand. Soil Dyn Earthq Eng 24(3):181–187

    Article  Google Scholar 

  • Ni Q, Tan TS, Dasari GR, Hight DW (2004) Contribution of fines to the compressive strength of mixed soils. Géotechnique 54(9):561–569

    Article  Google Scholar 

  • Omidi GH, Prasad TV, Thomas JC, Brown KW (1996) The influence of amendments on the volumetric shrinkage and integrity of compacted clay soils used in landfill liners. Water Air Soil Pollut 86(1–4):263–274

    Article  Google Scholar 

  • Pusch R (1979) Highly compacted sodium bentonite for isolating rock-deposited radioactive waste products. Nucl Technol (UnitedStates) 45(2):153–157

    Article  Google Scholar 

  • Pusch R (1982) Mineral-water interactions and their influence on the physical behavior of highly compacted Na bentonite. Can Geotech J 19(3):381–387

    Article  Google Scholar 

  • Rahman MM, Lo SR, Gnanendran CT (2008) On equivalent granular void ratio and steady state behaviour of loose sand with fines. Can Geotech J 45(10):1439–1456

    Article  Google Scholar 

  • Rees EVL, Priest JA, Clayton CRI (2011) The structure of methane gas hydrate bearing sediments from the Krishna-Godavari Basin as seen from Micro-CT scanning. Mar Pet Geol 28(7):1283–1293

    Article  Google Scholar 

  • Rice EE, Edgecombe DS, Compton PR, Best RE (1982) U.S. program assessing nuclear waste disposal in space-A 1981 status report. In: Space mankind’s fourth environment. Pergamon, pp 295–305. https://doi.org/10.1016/B978-0-08-028708-9.50025-7

  • Rowe RK, Brachman RWI, Hosney MS, Take WA, Arnepalli DN (2017) Insight into hydraulic conductivity testing of geosynthetic clay liners (GCLs) exhumed after 5 and 7 years in a cover. Can Geotech J 54(8):1118–1138

    Article  Google Scholar 

  • Sanden T, Nilsson U, Andersson L (2016) Investigation of parameters influencing bentonite block quality. Swedish, Svensk Kulling Boskap, pp 16–22. https://www.skb.com/publication/2484969/P-16-06.pdf

  • Schanz T, Tripathy S (2009) Swelling pressure of a divalent-rich bentonite: Diffuse double-layer theory revisited. Water Resour Res. https://doi.org/10.1029/2007WR006495

    Article  Google Scholar 

  • Schanz T, Yasir A (2014) Swelling pressure characteristics of compacted Chinese Gaomiaozi bentonite GMZ01. Soils Found 54(4):748–759

    Article  Google Scholar 

  • Sridharan A, Prakash K (2000) Shrinkage limit of soil mixtures. Geotech Test J 23(1):3–8

    Article  Google Scholar 

  • Sun DA, Sun WJ, Cui HB (2009) Swelling of compacted sand–bentonite mixtures. Appl Clay Sci 43(3):485–492

    Article  Google Scholar 

  • Sun DA, Zhang JY, Zhang JR, Zhang L (2013) Swelling characteristics of GMZ bentonite and its mixtures with sand. Appl Clay Sci 83:224–230

    Article  Google Scholar 

  • Sun WJ, Wei ZF, Sun DA, Liu SQ, Fatahi B, Wang XQ (2015) Evaluation of the swelling characteristics of bentonite-sand mixtures. Eng Geol 199:1–11

    Article  Google Scholar 

  • Sun WJ, Zong FY, Sun DA, Wei ZF, Schanz T, Fatahi B (2017) Swelling prediction of bentonite-sand mixtures in the full range of sand content. Eng Geol 222:146–155

    Article  Google Scholar 

  • Swedish Nuclear Fuel and Waste Management (1992) Final disposal of spent nuclear fuel-SKB9. importance of the bedrock for safety. KBS Technical Report. p 20. http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/24/024/24024040.pdf

  • Tan Y, Zhang HY, Wang Y (2020) Evaporation and shrinkage processes of compacted bentonite-sand mixtures. Soils Found 60:505–519

    Article  Google Scholar 

  • Tang CS, Cui YJ, Tang AM, Shi B (2011) Volumetric shrinkage characteristics of soil during drying. Chinese J Geotech Eng 33(08):1271–1279 (in Chinese)

    Google Scholar 

  • Tay YY, Stewart DI, Cousens TW (2001) Shrinkage and desiccation cracking in bentonite-sand landfill liners. Eng Geol 60:263–274

    Article  Google Scholar 

  • Tovey NK (1980) A digital computer technique for orientation analysis of micrographs of soil fabric. J Microsc 120:303–315

    Article  Google Scholar 

  • Villar MV, Lloret A (2008) Influence of dry density and water content on the swelling of a compacted bentonite. Appl Clay Sci 39(1–2):38–49

    Article  Google Scholar 

  • Villar MV, Pérez del Villar L, Martin PL, Pelayo M, Femández AM, Garralón A, Cuevas J, Leguey S, Caballero E, Huertas FJ, Jiménez de Cisneros C, Linares J, Reyes E, Delgado A, Fernández-Soler JM, Astudillo J (2006) The study of Spanish clays for their use as sealing materials in nuclear waste repositories: 20 years of progress. J Iber Geol 32(1):15–36

    Google Scholar 

  • Walton S (1980) Nuclear Waste Disposal: U.S. Eyes Burial at Sea. BioScience 30(11):729–732

    Article  Google Scholar 

  • Wang J, Chen WM, Guo YH (2006) Deep geological disposal of high-level radioactive wastes in China. Chin J Rock Mech Eng 25(4):649–649 (in Chinese)

    Google Scholar 

  • Wang Q, Tang AM, Cui YJ, Delage P, Gatmiri B (2012) Experimental study on the swelling behavior of bentonite/claystone mixture. Eng Geol 124(1):59–66

    Article  Google Scholar 

  • Wen ZJ (2006) Physical property of China’s buffer material for high-level radioactive waste repositories. Chinese J Rock Mech Eng 25(4):794–800 (in Chinese)

    Google Scholar 

  • Xie Y, Chen ZH, Sun SG, Li G, Fang XW (2007) Volumetric shrinkage characteristics of soil during drying. Chinese J Rock Soil Mech 08:1636–1642 (in Chinese)

    Google Scholar 

  • Xu L, Ye WM, Chen B, Chen YG, Cui YJ (2016) Experimental investigations on thermo-hydro-mechanical properties of compacted GMZ01 bentonite-sand mixture using as buffer materials. Eng Geol 213:46–54

    Article  Google Scholar 

  • Ye WM, Chen YG, Chen B, Wang Q, Wang J (2010) Advances on the knowledge of the buffer/backfill properties of heavily-compacted GMZ bentonite. Eng Geol J 116:12–20

    Article  Google Scholar 

  • Zhang F, Ye WM, Chen YG, Chen B, Cui YJ (2016) Influences of salt solution concentration and vertical stress during saturation on the volume change behavior of compacted GMZ01 bentonite. Engi Geol 207:48–55

    Article  Google Scholar 

  • Zhang H, Tan Y, Zhu F, He DJ, Zhu JH (2019) Shrinkage property of bentonite-sand mixtures as influenced by sand content and water salinity. Constr Build Mater 224:78–88

    Article  Google Scholar 

  • Zhiyan Consulting Group (2017) 2017–2022 China’s nuclear waste treatment market operation situation and investment strategy research report. https://baijiahao.baidu.com/s?id=1772446403968877323&wfr=spider&for=pc (in Chinese)

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Funding

This work was supported by the National Natural Science Foundation of China (Grant No. 41925012, 42230710, 42172290, 42007244), Natural Science Foundation of Jiangsu Province (Grant No. BK20211087), and the Fundamental Research Funds for the Central Universities. The micro-CT tests in this study were conducted at State Key Laboratory of Paeobiology and Stratigraphy of Nanjing Institute of Geology and Palaeotology, Chinese Academy of Sciences.

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Authors and Affiliations

  1. School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China

    Dong-Wei Wang, Chao-Sheng Tang, Qing Cheng, Sheng-Jie Li & Bin Shi

  2. Department of Civil and Environmental Engineering, Rowan University, 201 Mullica Hill Road, Glassboro, NJ, 08028, USA

    Cheng Zhu

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  1. Dong-Wei Wang
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  2. Cheng Zhu
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  3. Chao-Sheng Tang
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Correspondence to Chao-Sheng Tang.

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Wang, DW., Zhu, C., Tang, CS. et al. Experimental study on shrinkage characteristics of compacted bentonite–sand mixtures. Bull Eng Geol Environ 83, 43 (2024). https://doi.org/10.1007/s10064-023-03521-9

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