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Compacted sand–bentonite mixtures for the confinement of waste landfills.

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Title: Compacted sand–bentonite mixtures for the confinement of waste landfills.
Authors: Proia, Robeta1 (AUTHOR), Salvatore, Erminio2 (AUTHOR) e.salvatore@unicas.it, Croce, Paolo2 (AUTHOR), Modoni, Giuseppe2 (AUTHOR)
Source: Acta Geotechnica. Dec2024, Vol. 19 Issue 12, p8007-8022. 16p.
Subjects: Oedometers (Soil mechanics), Hydraulic conductivity, Waste management, Solid waste, Bentonite
Abstract: This paper illustrates the results of an experimental study on sand–bentonite mixtures for their use as confinement barriers for solid waste landfills. The mixtures have been prepared parametrically varying the percentage of bentonite. The sample preparation method was established willing to simulate the compaction processes on site. In fact, the compacted samples were tested following two different stress-wetting paths representative of the possible stress and imbibition sequences occurring on a landfill confinement barrier. In the first case, the barrier comes into contact with rainwater before being subjected to the overloading stress induced by waste disposal, while, in the second case, the barrier is overloaded by the waste before being wetted by the leachate. The compressibility and permeability of the sand–bentonite mixtures were determined, in both cases, by oedometric compression tests. The experimental results are analysed and compared in order to evaluate the influence of the bentonite content on the mechanical and hydraulic behaviour of the mixture. Interpretation of the results is also accomplished with a micro-mechanical investigation of the mixtures fabric. Suitable compositions of sand and bentonite are finally proposed for the design of effective confinement barriers. [ABSTRACT FROM AUTHOR]
Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Compacted sand–bentonite mixtures for the confinement of waste landfills.
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  Data: <searchLink fieldCode="JN" term="%22Acta+Geotechnica%22">Acta Geotechnica</searchLink>. Dec2024, Vol. 19 Issue 12, p8007-8022. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Oedometers+%28Soil+mechanics%29%22">Oedometers (Soil mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Hydraulic+conductivity%22">Hydraulic conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Waste+management%22">Waste management</searchLink><br /><searchLink fieldCode="DE" term="%22Solid+waste%22">Solid waste</searchLink><br /><searchLink fieldCode="DE" term="%22Bentonite%22">Bentonite</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: This paper illustrates the results of an experimental study on sand–bentonite mixtures for their use as confinement barriers for solid waste landfills. The mixtures have been prepared parametrically varying the percentage of bentonite. The sample preparation method was established willing to simulate the compaction processes on site. In fact, the compacted samples were tested following two different stress-wetting paths representative of the possible stress and imbibition sequences occurring on a landfill confinement barrier. In the first case, the barrier comes into contact with rainwater before being subjected to the overloading stress induced by waste disposal, while, in the second case, the barrier is overloaded by the waste before being wetted by the leachate. The compressibility and permeability of the sand–bentonite mixtures were determined, in both cases, by oedometric compression tests. The experimental results are analysed and compared in order to evaluate the influence of the bentonite content on the mechanical and hydraulic behaviour of the mixture. Interpretation of the results is also accomplished with a micro-mechanical investigation of the mixtures fabric. Suitable compositions of sand and bentonite are finally proposed for the design of effective confinement barriers. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s11440-024-02335-7
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      – Code: eng
        Text: English
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        Type: general
      – SubjectFull: Hydraulic conductivity
        Type: general
      – SubjectFull: Waste management
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            – D: 01
              M: 12
              Text: Dec2024
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