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Effects of alkaline solution on shear strength of GMZ bentonite as a buffer/backfill material in China

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Abstract

The concrete in the auxiliary structure decomposes to produce high-alkaline pore water in the disposal repositories thus substantially affecting the mechanical properties of bentonite. Direct shear tests have been performed on GMZ01 bentonite inundated in NaOH and KOH solutions for evaluating the alkaline solution impact on its shear strength (SS). The experimental results reveal that the SS value is directly related to the concentration of the two kinds of alkaline solution. At the same concentration, the SS of the sample treated with KOH solution is higher than that of the NaOH solution. The concept of modified effective stress p' helps to understand the SS of bentonite eroded by alkaline solution on the basis of Mohr–Coulomb criterion. Upon further analyses, it was found that angle of internal friction φ' increased at higher alkaline concentration. The micrographs of scanning and transmission electron microscopy analyses revealed the cracking of smectite aggregates depicted as smaller stacks after corrosion of alkaline solution. As a result, the smectite layers surface was nonuniform which led to the increase of surface roughness as well as the φ′. The effective cohesion c′ remained unchanged in NaOH solutions, however, it was observed to increase with the KOH concentration which is mainly due to the strong K-linkage of K+.

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References

  1. Anson RWW, Hawkins AB (1998) The effect of calcium ions in pore water on the residual shear strength of kaolinite and sodium montmorillonite. Géotechnique 48(6):787–800

    Article  Google Scholar 

  2. Di Maio C, Scaringi G (2016) Shear displacements induced by decrease in pore solution concentration on a pre-existing slip surface. Eng Geol 200:1–9

    Article  Google Scholar 

  3. Elkady TY, Al-Mahbashi AM (2017) Effect of solute concentration on the volume change and shear strength of compacted natural expansive clay. Environ Earth Sci 76(14):483

    Article  Google Scholar 

  4. Fernández R, Cuevas J, Sánchez L, Villa RV, Leguey S (2006) Reactivity of the cement–bentonite interface with alkaline solutions using transport cells. Appl Geochem 21(6):977–992

    Article  Google Scholar 

  5. Fang YG, Ou ZF, Li B (2019) Effect of pore fluid concentration on shear strength of soft clay. Soil Mech Found Eng 56(4):265–272

    Article  Google Scholar 

  6. Hayakawa T, Minase M, Fujita KI, Ogawa M (2016) Modified method for bentonite purification and characterization; A case study using bentonite from Tsunagi Mine, Niigata. Japan Clay Clay Miner 64(3):275–282

    Article  Google Scholar 

  7. He Y, Ye WM, Chen YG, Cui YJ (2019) Effects of K+ solutions on swelling behavior of compacted GMZ bentonite. Eng Geol 249:241–248

    Article  Google Scholar 

  8. Nakayama S, Sakamoto Y, Yamaguchi T, Akai M, Tanaka T, Sato T, Iida Y (2004) Dissolution of montmorillonite in compacted bentonite by highly alkaline aqueous solutions and diffusivity of hydroxide ions. Appl Clay Sci 27(1–2):53–65

    Article  Google Scholar 

  9. Pitzer KS, Mayorga G (1973) Thermodynamics of electrolytes. II. Activity and osmotic coefficients for strong electrolytes with one or both ions univalent. J Phys Chem 77(19):2300–2308

    Article  Google Scholar 

  10. Ramrez S, Cuevas J, Vigil R, Leguey S, (2002) Hydrothermal alteration of “La Serrata” bentonite (Almeria, Spain) by alkaline solutions. Appl Clay Sci 21(5–6):257–269

    Article  Google Scholar 

  11. Sun Z, Chen YG, Cui YJ (2018) Effect of synthetic water and cement solutions on the swelling pressure of compacted Gaomiaozi (GMZ) bentonite: the Beishan site case, Gansu, China. Eng Geol 244:66–74

    Article  Google Scholar 

  12. Sun Z, Chen YG, Cui Y (2020) Adsorption of Eu (III) onto Gaomiaozi bentonite corroded by cement waters: Effect of cement solutions on the long-term sorption performance of bentonite in the repository conditions. J Clean Pro 251:119692

    Article  Google Scholar 

  13. Sun Z, Chen YG, Ye WM, Cui YJ, Wang Q (2020) Swelling deformation of Gaomiaozi bentonite under alkaline chemical conditions in a repository. Eng Geol 279:105891

    Article  Google Scholar 

  14. Xu YF, Xiang GS, Jiang H, Chu FF (2014) Role of osmotic suction in volume change of clays in salt solution. Appl Clay Sci 101:354–361

    Article  Google Scholar 

  15. Xu YF (2019) Peak shear strength of compacted GMZ bentonites in saline solution. Eng Geol 251:93–99

    Article  Google Scholar 

  16. Xiang GS, Ye WM, Jalal FE, Hu ZJ (2022) Shear strength of bentonite saturated with saline solutions exhibiting variety of cations. Eng Geol 298:106537

    Article  Google Scholar 

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

    Article  Google Scholar 

  18. Ye WM, Wan M, Chen B, Chen YG, Cui YJ, Wang J (2012) Temperature effects on the unsaturated permeability of the densely compacted GMZ01 bentonite under confined conditions. Eng Geol 126:1–7

    Article  Google Scholar 

  19. Ye WM, Zhang F, Chen YG, Chen B, Cui YJ (2017) Influences of salt solutions and salinization-desalinization processes on the volume change of compacted GMZ01 bentonite. Eng Geol 222:140–145

    Article  Google Scholar 

  20. Zhang L, Jia D (2016) Shear strength of GMZ07 bentonite and its mixture with sand saturated with saline solution. Appl Clay Sci 132:24–32

    Article  Google Scholar 

Download references

Acknowledgements

The authors acknowledge the National Natural Science Foundation of China (Grant Nos. 41702311, 42030714), Nature Science Foundation of Anhui Province of China (2208085MD98), and the Foundation of Key Laboratory of Soft Soils and Geoenvironmental Engineering (Zhejiang University), Ministry of Education (2020P03) for providing financial support.

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Authors and Affiliations

  1. College of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan, 243002, China

    Guosheng Xiang, Zhijie Hu & Wenqing Fu

  2. Department of Geotechnical Engineering, Tongji University, Shanghai, 200030, China

    Guosheng Xiang & Weimin Ye

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  1. Guosheng Xiang
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  2. Weimin Ye
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Correspondence to Guosheng Xiang or Weimin Ye.

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Xiang, G., Ye, W., Hu, Z. et al. Effects of alkaline solution on shear strength of GMZ bentonite as a buffer/backfill material in China. Acta Geotech. 19, 2013–2021 (2024). https://doi.org/10.1007/s11440-023-01990-6

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  • DOI: https://doi.org/10.1007/s11440-023-01990-6

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