Modeling gas breakthrough and flow phenomena through engineered barrier systems using a discrete fracture approach

Fabbri, Heber Agnelo Antonel; Sánchez, Marcelo; Maedo, Michael A.; Cleto, Pedro; Manzoli, Osvaldo L.

doi:10.1016/j.compgeo.2022.105148

Cited by 2 publications

(3 citation statements)

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“…It consequently leads to a higher AEV in biochar‐amended clays. In general, the biochar addition and the porewater salinity would certainly alter soil–water characteristics, which has the implication of minimizing the water percolation and gas breakthrough for clay‐engineered barriers (Fabbri et al., 2023).…”

Section: Resultsmentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

“…Sodium ions (Na + ) are the most abundantly reported electrolyte from the in situ pore fluid within clay barriers (Das & Bharat, 2021;Schofield & Kirkby, 2003). Therefore, NaCl solution was commonly adopted as the saline porewater (Das & Bharat, 2021;Zhou et al, 2017). The NaCl concentrations (by weight of the deionized water) of 0% (control), 1%, 5%, and 10% were selected, simulating the high-level porewater salinity conditions that were practically observed in landfill leachate samples (Zhou et al, 2017).…”

Section: Sample Preparationmentioning

confidence: 99%

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Influence of plasticity and porewater salinity on shrinkage and water retention characteristics of biochar‐engineered clays

Cai,

Bordoloi,

Zhu

et al. 2023

Soil Science Soc of Amer J

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Clay‐engineered barriers might be subjected to soil salinization issues under climate change. A recently emerged desalinization method is achieved by modifying clays using biochar. However, unsaturated soil responses of biochar‐engineered clays in saline environments under drought conditions remain unknown. This study aims to investigate soil shrinkage and water retention characteristics of biochar‐amended kaolin and bentonite under saline conditions. Soil shrinkage and water retention tests were conducted on clays (with and without biochar addition) with various porewater salinity (i.e., 0–10%). Physiochemical properties (including zeta potential and porewater pH) were measured to interpret particle‐fluid interactions. Shrinkage characteristics of kaolin and bentonite exhibited sensitivity and insensitivity to the porewater salinity, respectively. This phenomenon were explained by hydrogen‐sodium ion exchange and deprotonation phenomena occurring on kaolin and bentonite, respectively. Biochar significantly alleviated the salinity‐induced shrinkage of clays, by increasing the shrinkage limit of kaolin and bentonite by 6–14% and 50–107%, respectively (p < 0.05). This was attributed to the porous structure and hydrophilic functionality of biochar that immobilized sodium ions through ion exchange and protonation reactions. The air entry value of clays significantly increased with porewater salinity and biochar addition due to the reduction of void ratio and enhanced capillarity, respectively. An empirical equation was proposed to predict the shrinkage limit of clay in various saline conditions. It highlighted that the application of biochar‐engineered clays could contribute to the desalination and the improvement of resistance to shrinkage damage in hydro‐chemical barriers.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%