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Swelling Properties and Permeability of GMZ Bentonite-Sand Mixtures during Different Solutions Infiltration

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  • Yu-Ping Wang

    (School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
    International Faculty of Applied Technology, Yibin University, Yibin 644000, China
    Laboratory of Nuclear Wastes and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China)

  • Zhe Wang

    (School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
    Laboratory of Nuclear Wastes and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China)

  • Yu Zhao

    (School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China)

  • Fa-Cheng Yi

    (School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China
    Laboratory of Nuclear Wastes and Environmental Safety, Southwest University of Science and Technology, Mianyang 621010, China)

  • Bao-Long Zhu

    (School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China)

Abstract

In China, Gaomiaozi (GMZ) bentonite is recognized as a barrier material for isolating nuclear waste. Different chemical solutions may change the hydraulic conductivity and swelling capacity of bentonite. Consequently, a series of swelling pressure and permeability experiments was carried out on bentonite-sand mixtures with various dry densities and infiltrating solutions. X-ray diffraction (XRD) and the field emission scanning electron microscope (FESEM) were carried out on the samples experiencing the tests to identify the influence of chemistry pore solutions upon the mineralogical and microstructure changes. The results show that the swelling pressure experienced rapid swelling, slow expansion, and the stable expansion stage for the specimens of infiltrating solutions except for NaOH. For the specimens infiltrated with NaOH solutions, the swelling pressure experienced rapid increases, slow decreases, and a stable development stage. With hyper-alkaline and hyper-salinity infiltration, the swelling pressure decreased, and the permeability increased. In addition, swelling pressure attained stability more quickly on contact with hyper-alkaline and hyper-salinity solutions. Comparing the test results, the results indicate that the influence of NaOH on the expansion and permeability was higher than NaCl-Na 2 SO 4 at the same concentration.

Suggested Citation

  • Yu-Ping Wang & Zhe Wang & Yu Zhao & Fa-Cheng Yi & Bao-Long Zhu, 2021. "Swelling Properties and Permeability of GMZ Bentonite-Sand Mixtures during Different Solutions Infiltration," Sustainability, MDPI, vol. 13(4), pages 1-12, February.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:4:p:1622-:d:492485
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    References listed on IDEAS

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    1. Maria R.H. Takeuchi & Tatsuya Hasegawa & Linda McKinley & Gian Powell Marquez & Keiichi N. Ishihara, 2020. "What Is Suitable Leadership for High-Level Radioactive Waste (HLW) Management?," Sustainability, MDPI, vol. 12(20), pages 1-15, October.
    2. Gang Cheng & Hong-Hu Zhu & Ya-Nan Wen & Bin Shi & Lei Gao, 2020. "Experimental Investigation of Consolidation Properties of Nano-Bentonite Mixed Clayey Soil," Sustainability, MDPI, vol. 12(2), pages 1-15, January.
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    Cited by:

    1. Zhe Wang & Yuping Wang & Facheng Yi, 2022. "Effect of Various Aqueous Mediums on the Microstructure of Compacted Bentonite–Sand Mixture Characterized by X-ray CT Investigation," Sustainability, MDPI, vol. 14(15), pages 1-12, August.

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