A monolithic layered nonwoven–woven geotextile for use with drainage geocomposites in coal combustion residual projects

Narejo, Dhani; Li, Mengjia; Zimmel, E.; Wu, Yujie

doi:10.1016/j.geotexmem.2013.01.002

Cited by 21 publications

(6 citation statements)

References 21 publications

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“…The mechanical properties of polyester fabrics with standard deviations are shown in Table 2. The incorporation of LPET contributes to an increase in the tensile strength of PET fabrics, which in conformity with the findings of previous studies [18,19]. The optimal PET was selected according to the properties and it was the one having the ratio 50/30/ 20 and it was further used to make the final geotextile.…”

Section: Mechanical Properties Of Polyester Fabricssupporting

confidence: 86%

“…Only the hotpressed samples possess a distinct water resistance with all water passing through in 10 s, and yield an optimal water resistance of 86.4%. An increasing needle punching density fortifies the entanglement between fibers, thus augmenting the mechanical strength of the nonwoven fabrics, while also not causing any significant variations in the porosity [18,19]. The variations in porosities created by needle punching densities barely influence the water resistance of the geotextiles.…”

Section: Burst Strength Of Geotextiles As Related To Hot Pressingmentioning

confidence: 99%

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Effects of needle punching and hot pressing on mechanical properties of composite geotextiles

Lin

Hsieh

Huang

et al. 2016

Journal of Industrial Textiles

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This study proposes to make geotextiles from recycled materials. Polyester fibers, recycled polyester fibers, and low melting point polyester fibers are blended and needle punched to make the polyester fabrics, the mechanical properties of which are then evaluated to determine the optimal parameters. The polyester nonwoven fabrics are needle punched with various densities. Afterwards, the resulting polyester nonwoven fabrics, glass fiber woven fabrics, and polypropylene selvages are combined, needle punched, and hot pressed to form geotextiles, the properties of which are tested by tensile strength, tearing strength, burst strength, puncture strength, and water resistance tests. The test results show that polyester fabrics containing 50 wt% of polyester fibers have the optimal mechanical properties. Furthermore, needle punching at 90 needles/cm2 results in a greatest increase in mechanical properties of the polyester nonwoven fabrics. The tensile strength, tearing strength, and water resistance of the geotextiles increase as a result of hot pressing, and the bursting strength and puncture resistance are primarily associated with the needle punching densities. This study successfully creates composite geotextiles with reinforced mechanical properties by needle punching and hot pressing recycled polyester fabrics and polypropylene selvages.

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Section: Mechanical Properties Of Polyester Fabricssupporting

confidence: 86%

Section: Burst Strength Of Geotextiles As Related To Hot Pressingmentioning

confidence: 99%

Effects of needle punching and hot pressing on mechanical properties of composite geotextiles

Lin

Hsieh

Huang

et al. 2016

Journal of Industrial Textiles

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“…Cette filtration sur support ne correspond pas à l'acceptation traditionnelle de la filtration de sol par GTX, dans laquelle seules les particules immobiles sont retenues (critère de rétention des particules les plus grossières), alors que les particules mobiles ne doivent pas être stoppées par le GTX (critère de non-rétention des fines). De la même manière, les tests de compatibilité classiques des GTX avec les sols (Gradient Ratio) ne fonctionnent pas avec les boues (Aydilek et Edil, 2003 ;Narejo et al 2013). À partir de cet état de l'art et avec la volonté d'installer des géocomposites de drainage pour accélérer la consolidation des boues minières, des cellules de filtration sous pression (PF) ont été développées pour filtrer des boues minérales avec des GTX non tissés.…”

Section: éTat De L'artunclassified

Nonwoven geotextiles to filter clayey sludge: An experimental study

Bourgès-Gastaud¹,

Stoltz²,

Sidjui³

et al. 2014

Geotextiles and Geomembranes

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-L'industrie minière produit d'énormes quantités de déchets sous forme de boue minérale, comme les résidus fins matures issus de l'exploitation des sables bitumineux. Ces boues sont difficiles à assécher à cause de leur forte argilosité. Cet article propose une étude de la filtration sous pression de boues silto-argileuses par géotextiles non-tissés (GTX) : 8 GTX différents ont été testés avec une même boue fortement argileuse. Ensuite 8 boues de granularité différente ont été filtrées avec un même GTX. Ces boues sont composées de kaolinite et de silt dans différentes proportions afin d'obtenir 8 granularités différentes représentatives des boues minières (d50 entre 3 et 55 µm ; contenu en argile entre 0 et 38%). Les résultats indiquent que les boues peuvent être filtrées avec des GTX choisis sur la base de leur ouverture de filtration. Les GTX n'ont un impact que durant les premiers instants de la filtration, ils retiennent alors les particules les plus grossières ce qui induit la formation d'un gâteau de filtration. Ce gâteau devient très rapidement l'élément filtrant alors que le GTX n'est plus qu'un support. L'assèchement final atteint durant les tests est contrôlé par la composition de la boue et est totalement indépendant du GTX utilisé. Mots-clés : Filtration, Boue argileuse, Géotextile non-tissé, Assèchement ABSTRACT-Mining industry produces huge quantities of fine-grained mineral sludge, such as mature fine tailing from oil-sand extraction. These sludges are hard to dewater because of their high clay content and their low hydraulic conductivity. This paper describes pressure filtration tests in which eight different nonwoven geotextiles (GTXs) were used to filter high-clay-content sludges. The sludges were formulated by mixing kaolinite and silt to obtain eight different grain-size distributions (GSDs) with d 50 ranging from 3 to 55 mm and clay content ranging from 0% to 38% (d < 2 mm). The sludges created for this research had the GSD and variability of real fine tailings. The results indicate that sludges can be filtered with nonwoven GTXs selected on the basis of their pore-opening size. Furthermore, calendered GTXs are more efficient in retaining particles than needle punched GTXs. In addition, only during the early stage of filtration GTXs really influence filtering because it is at this stage that, by retaining coarser particles, they allow progressive formation of filter cake. Upon forming, the filter cake becomes the major contributor to particle retention. Finally, the sludge composition is found to be the most significant factor affecting the final state of dewatering.

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“…Kutay and Aydilek 21 conducted a laboratory test program to evaluate the filtration performance of four different woven/ nonwoven geotextile combinations with fly ash and bottom-sea dredged sediments, and found that a two-layer geotextile system significantly increased the filtration capacity. However, there are few studies 22,23 on composite filter of geotextile in tailings ponds.…”

Section: Introductionmentioning

confidence: 99%

Filtration characteristics of composite filter of woven-nonwoven geotextile in tailings ponds

Liu

Wang

et al. 2022

Journal of Industrial Textiles

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Nonwoven geotextiles are widely used in tailings ponds for filtration and drainage, but there is a risk of failure of nonwoven geotextile due to physical clogging. In this study, to reduce the clogging of nonwoven geotextile filter in tailings ponds and improve its long-term drainage performance, a layer of woven geotextile is placed between tailings and nonwoven geotextile to form a composite filter of woven-nonwoven geotextile. A series of gradient ratio tests were conducted to study the influence of the aperture of woven geotextile on the filtration characteristics of composite filter. The long-term filtration performance of composite filter was evaluated, and the filtration mechanism of composite filter was revealed. The results show that after adding a layer of woven geotextile with reasonable aperture upon the nonwoven geotextile, the gradient ratio of filter decreased and the flow rate of filter significantly increased. The filtration performance of composite filter of geotextile was better than that of nonwoven geotextile filter. The aperture of woven geotextile had an important influence on the filtration characteristics of composite filter. With the increase of the aperture of woven geotextile, the gradient ratio value of the composite filter decreased first and then increased. For relatively dense tailings, the recommended ratio of the equivalent aperture of woven geotextile (O95) to the characteristic particle diameter of tailings (d85) s is about 1.6.

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A monolithic layered nonwoven–woven geotextile for use with drainage geocomposites in coal combustion residual projects

Cited by 21 publications

References 21 publications

Effects of needle punching and hot pressing on mechanical properties of composite geotextiles

Effects of needle punching and hot pressing on mechanical properties of composite geotextiles

Nonwoven geotextiles to filter clayey sludge: An experimental study

Filtration characteristics of composite filter of woven-nonwoven geotextile in tailings ponds

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