Academic literature on the topic 'Bentonite clay based geosynthetic liner'

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Journal articles on the topic "Bentonite clay based geosynthetic liner"

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Khan, M. K., M. D. Camillis, G. D. Emidio, and A. Bezuijen. "Experimental study to evaluate soil water retention curve of HYPER clay geosynthetic clay liner." IOP Conference Series: Materials Science and Engineering 1260, no. 1 (2022): 012027. http://dx.doi.org/10.1088/1757-899x/1260/1/012027.

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Abstract Geosynthetic clay liners are widely used as hydraulic barrier due to their low hydraulic conductivity but bentonite in the liners loses its effectiveness due to significant thermal fluxes by both diurnal and seasonal heating and cooling cycles. Modified sodium carboxy methyl cellulose-based bentonite clay (HYPER clay) has shown better hydraulic performance in both situations. A possible reason for this improved performance of HYPER clay based geosynthetic clay liner is the improvement in the suction under changing thermal conditions. Thus, the relationship between soil suction and moisture content, also called the soil water retention curve, needs to be estimated. Therefore, we investigated the soil-water retention curve of the HYPER clay based geosynthetic clay liner and compared it with the untreated clay based geosynthetic clay liner. The article presents the suction test results on wetting path conducted on geosynthetic clay liner prototypes containing HYPER and untreated clay assessed by the contact filter paper method and the relative humidity sensor. The results showed that the geosynthetic clay liner containing HYPER clay has a high volumetric water content and thus, high water retention compared to untreated bentonite at a given suction value. In other words, the HYPER clay can be considered as a potential alternative to conventional bentonite due to its improved water retention capacity.
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Rowe, R. Kerry, Richard W. I. Brachman, and W. Andy Take. "Field measurements of overlap reductions for two reinforced fabric-encased geosynthetic clay liners (GCLs)." Canadian Geotechnical Journal 55, no. 5 (2018): 631–39. http://dx.doi.org/10.1139/cgj-2017-0375.

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Two geosynthetic clay liners (GCLs) reported to have experienced significant shrinkage at other locations are examined on both a 3H:1V south-facing slope and a relatively flat base on a silty sand. The GCLs were overlapped by 300 mm with 400 g/m of supplemental bentonite and covered by a black 1.5 mm high-density polyethylene (HDPE) geomembrane to form a composite liner that was left exposed in a full-scale field test embankment for a period of almost 5 years. It is shown that despite the relatively uniform exposure conditions, shrinkage is highly variable with a maximum shrinkage of GCL A being 165 mm on the slope and 415 mm on the base while GCL B shrunk by up to 75 mm on the side slope and only up to 25 mm on the base. The dominant role played by variable overlap stick and heterogeneity to the locations where the overlaps are re-wetted are discussed. Based on this study of shrinkage and a related study of downslope erosion at the same site, it is concluded that neither GCLs A nor B should be left in exposed composite liners when they can be subjected to thermal cycles that can lead to hydration and dehydration of the GCL.
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Zhu, Jianghong, Yu Tan, Craig H. Benson, Jimmy Youngblood, Sabrina Bradshaw, and Tuncer B. Edil. "Using viscosity as an index for polymer loading of bentonite-polymer composite geosynthetic clay liners." E3S Web of Conferences 569 (2024): 14002. http://dx.doi.org/10.1051/e3sconf/202456914002.

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Bentonite-polymer composite (BPC) geosynthetic clay liners (GCLs) containing a mixture of air-dry granules of bentonite and polymer have been developed for containment of wastes that generate leachates that are too aggressive for conventional sodium bentonite GCLs. Sufficient polymer loading is essential for BPC GCLs to maintain low hydraulic conductivity, and expedient methods are needed for manufacturing quality control and construction quality control to confirm that BPC GCLs contain sufficient polymer. In this study, a methodology for developed to estimate the polymer loading based on viscosity testing of slurries prepared with the BPC. A simplified version of the method can be used to determine if polymer is present in a BPC. Factors influencing the viscosity measurement were evaluated systematically, including water-to-BPC ratio, tempering time, and mixing method. The method that was developed consists of (1) adding deionized water to dry BPCs to achieve a water-to-BPC ratio of 30, (2) blending the BPC-water mixture with an overhead stirrer at 5000 rpm for 30 min to create a homogeneous slurry, (3) tempering the slurry in a zip-top bag for 24 hr, and (4) measuring the viscosity of the slurry in a viscometer at 300 and 600 rpm. Linear relationships were developed between polymer loading and viscosity for two BPC GCLs. Independent validation confirmed that the polymer loading estimated with the method is ±0.25% of the actual polymer loading.
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Salemi, Niloofar, Seyed Mehdi Abtahi, Mohammad Ali Rowshanzamir, and Seyed Mehdi Hejazi. "Improving hydraulic performance and durability of sandwich clay liner using super-absorbent polymer." Journal of Sandwich Structures & Materials 21, no. 3 (2017): 1055–71. http://dx.doi.org/10.1177/1099636217707559.

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The hydraulic performance and durability of geosynthetic clay liner containing various amounts of sodium polyacrylate polymer are experimentally studied. Sodium polyacrylate, generally known as a super-absorbent polymer, is a polymeric material with a potential of high water absorbance due to its chemical structure. In this study, sodium polyacrylate powder is used as a partial replacement of bentonite as much as 3%, 5% and 7% by the weight of bentonite. For comparison, the hydraulic performance of geosynthetic clay liner without super-absorbent polymer is also experimented. Atterberg limits, free swell index, hydraulic conductivity, self-healing capacity and wet/dry cycle tests are conducted in order to assess how super-absorbent polymer can affect the performance of geosynthetic clay liners as landfill liners and covers. The results show that the hydraulic conductivity and self-healing capacity of geosynthetic clay liner are relatively enhanced by super-absorbent polymer inclusion. The results of wet/dry cycle test show that using super-absorbent polymer as a partial replacement of bentonite considerably improves the durability of geosynthetic clay liner against wet/dry cycles. Geosynthetic clay liner containing super-absorbent polymer shows a negligible increase in hydraulic conductivity while there is a noticeable increase in hydraulic conductivity of specimen without super-absorbent polymer after 10 cycles of wetting and drying.
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Huai, Yang Yang, Zhong Lei Dou, Zhi Ming Sun, Shui Lin Zheng, and Hao Ran Cui. "The Research on Improving the Salt Resistance of Bentonite Used in Geosynthetic Clay Liner." Advanced Materials Research 476-478 (February 2012): 696–700. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.696.

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Geosynthetic Clay Liner, a water-proofing material which takes polymer as its carrier and bentonite as its basis, has been widely applied in the seepage-proofing projects including irrigation works, gardening and roadbed. In order to improve salt-resistance of bentonite used in Geosynthetic Clay Liner in saline environment, this paper innovatively uses chemical methods to modify the bentonite material. The experimental result shows that the optimum conditions are 100% of acrylic neutralization degree, 0.04%MBA, 1.2%KPS and holding at 70°C for 1 h. According to results of soil moisture supply capacity (MSC), swelling capacity of modified samples raises 30% ~170%.
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Lange, K., R. K. Rowe, H. Jamieson, R. L. Flemming, and A. Lanzirotti. "Characterization of geosynthetic clay liner bentonite using micro-analytical methods." Applied Geochemistry 25, no. 7 (2010): 1056–69. http://dx.doi.org/10.1016/j.apgeochem.2010.04.011.

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Brachman, R. W. I., A. Rentz, R. K. Rowe, and W. A. Take. "Classification and quantification of downslope erosion from a geosynthetic clay liner (GCL) when covered only by a black geomembrane." Canadian Geotechnical Journal 52, no. 4 (2015): 395–412. http://dx.doi.org/10.1139/cgj-2014-0241.

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Field observations of downslope bentonite erosion from a geosynthetic clay liner (GCL) covered by only a black geomembrane are reported for a composite liner left exposed without a protective soil cover for much longer than recommended by the GCL manufacturer. A new nondestructive, light-transmission technique developed to investigate bentonite erosion features in the field is presented. A classification system is developed to describe the type of erosion features observed. Results from five field investigations at the Queen’s University Environmental Liner Test Site (QUELTS II) are reported to quantify the onset, progression, and severity of downslope erosion for one particular geotextile-encased, needle-punched GCL for exposure periods of between 7 weeks and 1.3 years. The first significant erosion feature (type “E”with bentonite loss narrower than 2.5 cm) was observed after 6 months of exposure. Irrecoverable erosion features (type “EE” with bentonite loss wider than 2.5 cm) were observed after 12 months of exposure. These findings highlight the need to follow the manufacturer’s recommendations for timely covering of a composite liner with soil following liner installation.
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Seah, Yew-Heng Sherman, and Eng-Choon Leong. "Shrinkage cracks of bentonite-zeolite mixtures." E3S Web of Conferences 382 (2023): 14002. http://dx.doi.org/10.1051/e3sconf/202338214002.

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Bentonite is commonly used in geosynthetic clay liner (GCL) as well as compacted clay liner (CCL) for containment facilities such as sanitary landfills due to its low permeability. Bentonite experiences significant shrinkage on drying, leading to the formation of desiccation cracks and increasing the likelihood of contaminant leachate from the landfill. Adding granular materials such as fine sand to bentonite canreduce shrinkage and hence shrinkage cracks. Recently, zeolite has been suggested as another possible additive to reduce be shrinkage cracks in bentonite. Zeolite has additional benefits of being able to adsorb heavy metals and when enriched with silver, zinc, or copper, it can function as a biocide. The objective of this paper is to present the results of a study on shrinkage crack formation of bentonite-zeolite mixtures during drying. The evolution of shrinkage cracks of the bentonite-zeolite mixtures on drying was studiedusing image processing. The results show that desiccation cracks are at a minimum when the zeolite content is between 15% and 20%. The finding is useful to design more efficient GCL or CCL when zeolite is incorporated into the bentonite layer.
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Chai, Jin-Chun, and Nutthachai Prongmanee. "Barrier properties of a geosynthetic clay liner using polymerized sodium bentonite." Geotextiles and Geomembranes 48, no. 3 (2020): 392–99. http://dx.doi.org/10.1016/j.geotexmem.2019.12.010.

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Hoai, T. T., M. T. Nhuan, T. Mukunoki, T. T. Dung, and L. T. K. Linh. "Modelling migration of ammonium ion through landfill bottom barriers subjected to elevated temperature and dry-wet cycles, a case study in southern Hanoi, Vietnam." IOP Conference Series: Earth and Environmental Science 1226, no. 1 (2023): 012018. http://dx.doi.org/10.1088/1755-1315/1226/1/012018.

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Abstract Geosynthetic clay liners and compacted clay liners are common bottom barriers in landfills. One of the important steps in barrier design is to evaluate the effectiveness of the bottom barrier system in practical conditions based on modelling contaminant migration. This study simulates the migration of ammonium ions through proposed bottom barriers for design under consideration of the southern Hanoi area’s temperature and geohydrology conditions, then evaluates potential impacts on normalized ammonium concentration in groundwater. Proposed bottom barriers include geosynthetic clay liner and compacted clay liner constituting from local soils. The results indicated the reclamation of locally natural soils and geosynthetic clay liner (GCL) placement was approximately 5.2 and 13.4 times more effective in slowing ammonium migration than natural soil, respectively. Compacted clay liner of natural soils exhibited few impacts from elevated temperature. However, being sensitive to an elevated temperature at 50°C, the barrier performance of GCL caused the peak normalized ammonium concentration in groundwater to be 4.2 times higher than normal conditions. Notably, normalized ammonium concentration in groundwater increased 29 times when the geosynthetic clay liner was exposed to 2 dry-wet cycles with ammonium solution. These results provided useful references for designers and engineers to consider in selecting barrier materials in the new landfill.
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Dissertations / Theses on the topic "Bentonite clay based geosynthetic liner"

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Rolfe, Damian C. "An investigation into a bentonite clay based geosynthetic liner in a caustic refinery environment." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/828.

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Bauxite residue (red mud) management is a major environmental issue for alumina refineries. The global average for residue storage can cover in excess of 2.1 million square metres per refinery and is increasing annually by 300 to 400 thousand square metres. Residue has the potential to damage surface and groundwater quality due to the residue’s high alkalinity. Bauxite residue drying areas (RDAs) need to be designed in a manner that is safe for the population and the natural environment. Currently, RDA construction practice relies on the placement of a minimum of two clay lifts, a constructed low permeability base and an embankment seal that is at least equivalent to a 0.5m depth of mechanically compacted clay with a permeability coefficient of less than 10-9m/sec. This is overlain with a high-density polyethylene (HDPE) geomembrane, as the primary seal against seepage of caustic liquor. In Western Australia it is becoming increasingly difficult to source sufficient clay for future RDA constructionTo continue to meet and improve on current community and environmental standards, this investigation proposes an alternative to the clay lining system. A factory prehydrated geosynthetic liner (GCL) was evaluated in terms of its feasibility and its use in the design of a RDA, which would reduce the dependency on the sourcing of mass volumes of high quality clay from potentially long distances. The investigation also reviews the use of the GCL in a structural application, utilising it as a secondary containment measure under concrete bunds containing alumina process tanks.
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Yu, Bowei. "Engineering Performance of Geosynthetic Clay Liners in Contact with Brine under High Temperature." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/23281.

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Geosynthetic Clay Liners (GCLs) have been widely adopted in barrier systems for waste containment facilities. GCLs must be adequately hydrated at all times to maintain their low hydraulic conductivity. However, in several applications the GCL is subjected to high temperatures and its bentonite is therefore at risk of dehydration and desiccation. This is the case in landfills, brine ponds, solar ponds and tailing ponds. Higher desiccation risks have been found in artificial ponds exposed directly to solar radiation. This is due to higher temperature (sometimes >80oC), as well as lower overburden pressures due to the shallow water depth. In addition, the GCL may be exposed to salt solutions. It is therefore that, understanding the behaviour of GCLs under the action of thermal gradients, in the presence of salt, is critical. The main findings of this project can be summarized as follows. The presence of brine resulted in changes in both osmotic and matric suctions in GCLs, as their SWCCs drastically changed when hydrated by a sodium rich brine. GCLs in column experiments experienced high levels of desiccation when subjected to thermal gradients. Creating air gaps between the composite liner and heat source led to a decrease of the temperature to which the GCL was exposed but did not reduce the extent of desiccation and cracking appreciably. Moreover, the polymer-enhanced GCL failed to self-heal when permeated with a sodium-rich brine. On the other hand, the new proposed I-GCLS design succeeded in increasing GCL hydration rates compared to conventional designs. In addition, when subjected to thermal gradients, the new design significantly reduced dehydration and completely prevented cracking. Finally, by adjusting parameters controlling moisture exchange between the liners and subsoils, reasonable predictions of liner system behaviour were obtained by the THM model, including predictions of GCL desiccation when subjected to relatively high heating temperatures (78oC).
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Weerasinghe, Isuri. "Investigation of the hydraulic performance at the geosynthetic clay liner overlap." Thesis, Queensland University of Technology, 2021. https://eprints.qut.edu.au/208258/1/Isuri_Weerasinghe_Thesis.pdf.

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Geosynthetic clay liners (GCL) are a critical barrier component in containment systems such as landfills and mines. This thesis presents a laboratory testing method and a numerical modelling technique to evaluate the hydraulic performance of Geosynthetic clay liner overlaps. The outcome of the thesis allows practitioners to evaluate specific GCL products and optimise the liner system performance based on the environmental conditions of the specific barrier applications. The industry benefits by reduced long-term experimentation and minimised financial costs, and improvement of service life of barrier systems, thereby minimising potential ground water contamination and contributing to environmental protection.
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Mendes, Marianna Jacominy de Amorim. "Etude des facteurs qui affectent la performance des géosynthétiques bentonitiques sous flux de gaz et liquides en barrières des installations de stockage de déchets." Grenoble, 2010. http://www.theses.fr/2010GRENU014.

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Géosynthétiques benthoniques (GCLs) sont matériaux synthétiques composées par un noyau de bentonite sodique ou calcique, en poudre ou en granulats, liés à un ou plus couches de géosynthétiques (géotextiles ou géomembranes en générale). Les GCLs peuvent être aiguillettes, cousus, liés par adhésive, entre autres. Lorsque le GCL est confinée et hydratée, il présente de bonnes propriétés d'étanchéité pour accomplir la fonction de barrière. Sa performance dépend, généralement de la conductivité hydraulique de la bentonite. Grâce à leur faible perméabilité, les GCLs sont souvent installés au fond ou couverture des Installations de Stockage de déchets (ISD) associés avec l'argile compactée (CCL) ou avec la géomembrane (GM). Des études précédentes ont investigué les facteurs qui affectent la fuite de gaz/liquide au travers les GCLs ou les étanchéités composites. Malgré la nature de la bentonite soit si importante pour la perméabilité des GCLs, il n'y a pas dans la littérature concernant l'influence de la nature de la bentonite dans la fuite de gaz au travers les GCL ou la fuite de liquide au travers les étanchéités composites. C'est pour quoi cette étude s'intéresse. On propose d'étudier également l'effet du procès de manufacture du GCL dans l'écoulement de liquide et transmissivité de l'interface GM-GCL. Deux études ont été menés : (i) investigation de la perméabilité aux gaz des GCL ; (ii) investigation du transfert de liquide au travers des étanchéités composites GM-GCL-CCL du a un endommagement dans la GM. Pour la première étude un équipement proposé récemment, basée sur la méthode de chute de pression a été utilisé pour mesurer la perméabilité aux gaz des GCLs. Trois GCLs cousus à base de bentonites de différentes natures (sodique naturelle, calcique naturelle et calcique activée) ont été testés. Les résultats indiquent que la teneur en eau gravimétrique nécessaire pour atteindre une certaine valeur de perméabilité dépend de la bentonite. Concernant la teneur en eau volumique, pratiquement la même relation a été obtenue, indépendamment de la bentonite. D'autres facteurs ont affecté plus significativement la perméabilité au gaz des GCLs : la dessiccation du au flux de gaz peut causer l'augmentation de la perméabilité et compromettre la performance du GCL comme barrière étanche. La deuxième étude s'est concentrée dans l'investigation de l'influence des caractéristiques du GCL sur l'écoulement de liquide au travers une étanchéité composite. GM-GCL-CCL. Quatre types de GCLs avec deux procès de manufacture (aiguilleté ou cousu) et deux natures de bentonite (sodique naturelle ou calcique naturelle) ont été testés. Les résultats indiquent que la nature de la bentonite n'affecte le flux que pendant le régime transitoire. Les valeurs de transmissivité de l'interface GM-GCL ont été calculées par une solution analytique qui a également possibilité des prédictions du débit de fuite au travers des étanchéités composites en configurations typiques du fond des ISD. Les résultats indiquent une faible influence de la nature de la bentonite dans l'écoulement de liquide au travers les étanchéités composites. Au même temps on a noté une certaine influence des chemins préférentielles de flux, notamment pendant le régime transitoire<br>Geosynthetic Clay Liners (GCLs) are synthetic materials composed by a core of calcium or sodium bentonite, either in powder or granular, bonded to one or more geosynthetic layers (geotextile or geomembrane, in general). These layers are usually bonded by an adhesive, needle-punching, stitch-bonding or sewing. When hydrated and confined, they fulfil functions of liquid or gas barrier with their hydraulic performance depending in most cases on the hydraulic conductivity of the bentonite. Thanks to their low permeability to water and gases, GCLs are often used in municipal solid waste landfill applications, combined to compacted clay liners (CCL) or with geomembranes (GM) as part of both bottom and cover liners. Previous studies were conducted to investigate the most important factors that influence the gas/liquid flow rate through GCLs or composite liners. Although the nature of bentonite is so important in the permeability of the GCLs there is a lack of data in the literature regarding the influence of the nature of the bentonite on the gas flow through GCLs and liquid flow through composite liners involving GCLs. That is what this thesis aims at clarifying. Furthermore, in conjunction with the nature of the bentonite, the impact of the manufacturing process of the GCL on the flow rate and transmissivity at GM-GCL interfaces was also discussed. Two studies were performed: (i) investigation of the GCL permeability to gas simulating the covering conditions of municipal solid waste landfill; (ii) investigation of liquid transfer through composite liners GM-GCL-CCL due to a defect in the geomembrane, simulating typical conditions of bottom liners in landfills. In the first study, an apparatus recently proposed, based on the falling pressure method, was used in tests to verify the GCL permeability to gas. Three stitch bonded GCLs from the same manufacturer differing by the bentonite nature (natural sodium, natural calcium and activated calcium) were tested. The results showed that the gravimetric water content of the GCL necessary to attain a certain permeability value depends on the bentonite nature, which was not observed in terms of volumetric water content. However, other factors showed to be more important than the nature of bentonite in the GCL permeability to gas: the desiccation due to the gas flow can increase significantly the permeability, which compromise the GCL performance as a gas barrier. The second study focused in investigating the influence of the GCL characteristics in the liquid flow through a composite liner under bottom liners solicitations. Four types of GCLs with two different bonding processes (stitch-bonded or needle-punched) and different bentonites (natural sodium or natural calcium) were tested. The results obtained showed no significant differences among flow rate versus time in most of the tests performed, especially after steady-state conditions of flow having been reached. An analytical solution was employed to estimate the transmissivity of the GM-GCL interfaces. This solution also allowed predictions of flow rates and radius of wetted areas for typical configurations of composite liners in the field. The results obtained showed little influence of the nature of the bentonite and the predominance of influence of the presence of preferential flow paths between the geomembrane and the GCL surface on the transmissivity of GM-GCL interfaces and flow rates through composite liners<br>Geocompostos bentoníticos (GCLs) são materiais sintéticos compostos por um núcleo de bentonita sódica ou cálcica, em pó ou em grânulos, unido a uma ou mais camadas de geossintéticos (geotêxtil ou geomembrana, geralmente). Essas camadas são ligadas por adesivo, agulhagem ou costura. Quando hidratados e confinados, eles cumprem função de barreira de líquidos ou gases com o seu desempenho dependendo, na maioria dos casos, da condutividade hidráulica da bentonita. Graças à baixa permeabilidade aos líquidos e gases, GCLs são comumente usados em aterros sanitários, associados a camada de argila compactada (CCL) e geomembrana (GM) para compor as impermeabilizações de cobertura e fundo dessas instalações. Estudos precedentes investigaram os fatores mais influentes no fluxo de gás/líquidos através de GCLs ou barreiras compostas. Apesar da natureza da bentonita ser tão importante para a permeabilidade dos GCLs, não há dados na literatura a respeito da influência da natureza da bentonita no fluxo de gás através de GCLs ou fluxo de líquidos através de barreiras compostas envolvendo GCLs. Isso é o tema que a presente tese quer esclarecer. Além de estudar a influência da natureza da bentonita, o impacto do processo de manufatura do GCL na vazão e na transmissibilidade na interface GM-GCL também foi discutido. Dois estudos foram conduzidos: (i) investigação da permeabilidade ao gás de GCLs simulando as condições de cobertura de aterros sanitários; (ii) investigação do transporte de líquidos através de barreiras compostas GM-GCL-CCL devido a um dano na geomembrana, sob condições típicas do fundo de aterros sanitários. No primeiro estudo, um equipamento recentemente proposto, cujo funcionamento baseia-se no método da queda de pressão, foi usado em ensaios para verificar a permeabilidade ao gás de GCLs. Três GCLs costurados do mesmo fabricante, diferindo pela natureza da bentonita (sódica natural, cálcica natural e cálcica ativada) foram testados. Os resultados mostram que o teor de umidade gravimétrica necessário para atingir certa permeabilidade depende da natureza da bentonita. O mesmo não foi observado em termos de teor de umidade volumétrica, destacando a importância da estrutura da bentonita na sua permeabilidade. No entanto, outros fatores se mostraram mais importantes do que a natureza da bentonita na permeabilidade ao gás dos GCLs: a dessecação devido ao fluxo de gás pode aumentar significativamente a permeabilidade, o que compromete o desempenho do GCL como barreira. O segundo estudo focou na investigação da influência das características do GCL no transporte de liquido através de uma barreira composta sob condições típicas da base de aterros sanitários. Quatro tipos de GCLs com dois processos de manufatura (costurado ou agulhado) e duas bentonitas diferentes (sódica natural ou cálcica natural) foram ensaiados. Os resultados obtidos mostram que não houve influência significativa de vazão versus tempo para os ensaios conduzidos, especialmente depois de atingido o regime permanente de fluxo. Uma solução analítica foi empregada para estimar a transmissibilidade da interface GM-GCL. Essa solução permitiu também a previsão de vazamento e raio da área molhada em barreiras compostas de dimensões reais. Os resultados obtidos mostram pouca influência da natureza da bentonita na vazão e a predominância de caminhos preferenciais de fluxo na interface transmissível GM-GCL
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Ashe, Lauren. "A Laboratory Examination of Down-slope Bentonite Erosion in Geosynthetic Clay Liners." Thesis, 2014. http://hdl.handle.net/1974/12164.

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Geosynthetic Clay Liners (GCLs) are commonly paired with a geomembrane and used as part of a composite liner system for landfill barriers. Under some circumstances, leaving a composite geomembrane/geosynthetic clay liner exposed to solar radiation in the field has been shown to cause shrinkage of the underlying GCL. Recent field studies have shown that leaving a composite liner exposed can also lead to down-slope erosion of bentonite from the GCL due to the down-slope movement of moisture. To investigate the factors that can affect the onset of bentonite erosion in a GCL an experimental technique was developed to reproduce similar erosion in the laboratory. The test method simulates the features that occur with the erosion of bentonite caused by down-slope migration of evaporative water in the field. One needle-punched GCL was tested to examine the factors that can affect the onset of erosion of bentonite particles with the flow of water. The factors examined include the effect of the initial wet/dry cycle, water source chemistry, flow rate, slope, prior cation exchange, and the effect of no drying phase in the test cycle. Ten different manufactured GCL products were tested to examine the effect of material properties on the erosion of bentonite from a GCL. The material properties of the products tested differed in terms of the type of carrier and cover geotextiles, bentonite (powdered, fine and coarse grained, and some with a polymer enhancement additive) and the presence of a polypropylene coating over the geotextile. It was found that the most critical factor to trigger the onset of bentonite erosion was the water source chemistry, with the tests that simulated the evaporation and condensation of water (deionized water) below an exposed composite liner leading to the formation of major erosion features. The results of the laboratory testing program also show that erosion features are more visible in products with white coloured geotextiles. The products containing a polypropylene coated geotextile and polymer enhanced bentonite slowed or, in some cases, prevented erosion features from developing.<br>Thesis (Master, Civil Engineering) -- Queen's University, 2014-05-01 10:16:14.05
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Book chapters on the topic "Bentonite clay based geosynthetic liner"

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Miles, W. J. "Chemical, mineralogical and physical characterization of bentonite for geosynthetic liner applications." In Clay Geosynthetic Barriers. CRC Press, 2021. http://dx.doi.org/10.1201/9781003078777-17.

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Khan, Vishwajeet, and S. Rajesh. "Mineral and Chemical Characterization of Geosynthetic Clay Liner Bentonite." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-2704-9_19.

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Lake, C., and R. Rowe. "Contaminant transport through GCL-based liner systems." In Geosynthetic Clay Liners for Waste Containment Facilities. CRC Press, 2010. http://dx.doi.org/10.1201/b10828-6.

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Boscov M.E.G., Soares V., Vasconcelos F.D., and Ferrari A.A.P. "Geotechnical properties of a silt-bentonite mixture for liner construction." In Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2009. https://doi.org/10.3233/978-1-60750-031-5-217.

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Abstract:
Cover and bottom liners at waste disposal sites are usually composed of a compacted clay layer (CCL) or a geosynthetic clay liner (GCL) overlain by a geomembrane. Employing local materials in the compacted layer should be attempted, since transportation costs and environmental impacts associated to borrow pit exploitation may be significantly reduced. Saprolitic silty soils of acidic rocks, which occur extensively in tropical regions, may present adequate geotechnical properties when compacted and confined, but their compacted permeability is generally at least tenfold higher than the limit value of 10&amp;minus;9m/s usually required for liners. Furthermore, characterization of this construction material is particularly difficult due to the occurrence of thick layers with great spatial heterogeneity relative to mechanical and hydraulic properties. This paper shows the results of an investigation on the technical feasibility of using a silty saprolitic soil of the metropolitan region of S&amp;atilde;o Paulo for liner construction by means of bentonite addition and compaction at modified energy. Initially, optimum bentonite content was determined considering the mixture permeability. Compressibility, shear strength and expansibility were also determined for the natural soil and the soil-bentonite mixture. A test liner was built in a waste disposal site to consider practical construction aspects. Bentonite addition reduces soil permeability and ensures conformity to specification limits, without significantly modifying other geotechnical properties. The swelling potential of the natural soil and the mixture is a negative aspect that has to be properly addressed.
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Eid M.M., Abdelrahman M.T., and Abdel-Aal F.M.B. "Sand bentonite mixture as a secondary liners in landfills." In Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2009. https://doi.org/10.3233/978-1-60750-031-5-225.

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Engineering specifications for a compacted clay liner are based mainly on a permeability coefficient less than 10&amp;minus;7cm/s. Sand-bentonite mixtures are often used as a barrier material when there is a lack of naturally occurring clayey soils at a site. The addition of small amounts of bentonite (5-15%) improves the performance of a granular material providing a low permeability and an enhanced mechanical stability. In addition, bentonites, obtained in dry, powdered forms, are much easier to blend with onsite sandy soils and to be compacted than wet, sticky clods of clay. Thus, this paper investigates the permeability coefficient of the sand bentonite mixtures. The factors affecting it such as the bentonite content and the impact of real municipal solid waste leachate on the liner permeability are investigated. Volume change after inundation is also investigated taking into consideration the effect of the bentonite content and the type of the permeating fluid. The composite liner consisting from geomembrane (HDPE) sheets as a primary liner and sand bentonite mixture as a secondary liner is tested. The effect of imperfections of the HDPE sheets on the overall permeability of the composite liner is emphasized to clarify importance of the secondary liner in the prevention of the groundwater table contamination.
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Katsumi T. and Fukagawa R. "Factors affecting the chemical compatibility and the barrier performance of GCLs." In Proceedings of the 16th International Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2005. https://doi.org/10.3233/978-1-61499-656-9-2285.

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The chemical compatibility and the barrier performance of geosynthetic clay liners (GCLs) were examined in this paper. The use of GCLs as hydraulic barriers in liner and cover systems for waste containment facilities is on the rise. GCLs consist of a thin layer of bentonite sandwiched between two geotextiles or glued to a geomembrane. Their extremely low hydraulic conductivity to water is attributed to the bentonite in the GCLs, which is composed primarily of a smectite mineral. However, there have been concerns as to the chemical compatibility of GCLs, since bentonite is very sensitive to chemical effects and this can lead to an increase in hydraulic conductivity. The present study focuses on (1) the difference in performance between powdered and granular types of bentonite, (2) the influence of real waste leachates on the hydraulic conductivity of GCLs, (3) the effect of the overburden pressure on the hydraulic conductivity of GCLs, and (4) the chemical compatibility of modified bentonite and its long-term performance.
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Legg Peter and McLennan Molly. "Is there a future for GCLs in Waste Barrier Systems?" In Proceedings of the 15th African Regional Conference on Soil Mechanics and Geotechnical Engineering. IOS Press, 2011. https://doi.org/10.3233/978-1-60750-778-9-89.

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Geosynthetic clay liners (GCLs) are commonly used in geocomposite waste barrier systems as replacement for compacted clay liners. In recent years a number of problems associated with GCLs have been identified including panel shrinkage, desiccation cracking, chemical incompatibility, cation exchange and lack of hydration in geomembrane/GCL composite liner systems. The most important factor affecting the performance of a GCL is cation exchange in the bentonite. Leachate compatibility testing of the GCL is therefore necessary, initially by swell index testing, followed by hydraulic conductivity testing if the swell index test indicates promising results. The results of leachate GCL compatibility testing performed for four waste disposal facilities are presented and their influence on the respective barrier designs. It is concluded that there is a future for the use of GCLs in waste barrier systems provided that the compatibility of the GCL is confirmed through testing
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Conference papers on the topic "Bentonite clay based geosynthetic liner"

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Herlin, Bruno, and Kent von Maubeuge. "Geosynthetic Clay Liners (GCLs)." In 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27012.

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Geosynthetic Clay Liner’s (GCLs) are an established sealing product in the geoenvironmental industry. They are used in landfill applications as caps and base liners, secondary containment for fuel storage facilities, as well as within various other containment structures such as dams, canals, rivers, and lakes. Rolled out like a carpet to provide a durable impermeable liner, Geosynthetic Clay Liners consist of a layer of high swelling sodium bentonite sandwiched between two geotextiles. Manufactured around the world in different techniques, the Canadian manufactured GCL, is mechanically bonded by needlepunching from one nonwoven geotextile through the bentonite to the other nonwoven or woven geotextile. The low hydraulic conductivity of the GCLs are used mainly as a replacement to thick, difficult to build compacted clay liners to provide a barrier to liquids and gases, offering both a technical and economical advantage. GCLs, with an average thickness of 7mm, offer a volume advantage over Compacted Clay Liners. They are more capable of withstanding freeze-thaw and wet-dry cycles; offer substantial construction cost savings in reduced on-site QC/QA and a quicker installation. Furthermore, GCLs offer equivalent or lower rates of release of fluids and chemicals than Compacted Clay Liners (CCLs). Bentonite is a clay mineral with expansive characteristics and low permeability, where montmorillonite is the chief mineral. Montmorillonite, swells when contacted with water approximately 900% by volume or 700% by weight. When hydrated under confinement, the bentonite swells to form a low permeability clay liner, the equivalent hydraulic protection of several feet of compacted clay. A relatively new engineering material for some, geosynthetic clay liners have been used extensively over the past two decades, and are finding increasing use in every sector of the environmental industry. This paper will review the technical properties of these materials, their documentation at the research level, their integrity as a sealing barrier and recent field applications in the pipeline industry. Further, because these materials are factory produced, their properties are predictable, assisting the engineer to design with a high confidence level. Technical properties and economical benefits are sure to further increase GCL installations around the world to protect our environment and more importantly our groundwater.
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Chen, Jiannan, Craig H. Benson, William J. Likos, and Tuncer B. Edil. "Interface Shear Strength of a Bentonite-Polymer Geosynthetic Clay Liner and a Textured Geomembrane." In Geotechnical Frontiers 2017. American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480434.022.

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Tian, Kuo, Craig H. Benson, and William J. Likos. "Effect of an Anion Ratio on the Hydraulic Conductivity of a Bentonite-Polymer Geosynthetic Clay Liner." In Geotechnical Frontiers 2017. American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480434.018.

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Li, Dong, and Kuo Tian. "Effects of Prehydration on Hydraulic Conductivity of Bentonite-Polymer Geosynthetic Clay Liner to Coal Combustion Product Leachate." In Geo-Congress 2022. American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484012.057.

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Zhao, Hanrui, and Kuo Tian. "Effect of Polymer Elution on Shear Strength of Interface between Smooth Geomembrane and Bentonite-Polymer Geosynthetic Clay Liner." In Geotechnical Frontiers 2025. American Society of Civil Engineers, 2025. https://doi.org/10.1061/9780784485972.030.

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Khan, Vishwajeet, and Rajesh Sathiyamoorthy. "Hydration Characteristics of Bentonite Core of Geosynthetic Clay Liner: Key Role of Wet–Dry Cycles and Hydrating Fluids." In Geo-EnvironMeet 2025. American Society of Civil Engineers, 2025. https://doi.org/10.1061/9780784485699.044.

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