Effect of hydrating liquid on the hydraulic properties of geosynthetic clay liners

Shan, Hsin-Yu; Lai, Yen Jing

doi:10.1016/s0266-1144(01)00023-1

Cited by 84 publications

(36 citation statements)

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“…Several studies were focused on determination of leachate effect on geosynthetic materials applied in construction of landfill bottom liner -usually geosynthetic clay liners (GCLs) used as hydraulic barrier in landfills, remediation sites or other contamination systems. Shan and Lai (2002) tested the hydraulic conductivity of two different geosynthetic liners: Bentomat ST and Claymax 200R, CETCO, USA, using different liquids as penetrating medium. Both tested GCLs were approx.…”

Section: Influence Of Leachates On Water Permeabilitymentioning

confidence: 99%

“…The trials of sequential permeation by water and then by leachate were also conduced. The results of the measurements conducted by Shan and Lai (2002) are presented in Table 3. Hydraulic conductivity of two types of geosynthetic clay liners (Shan & Lai, 2002 (Table 4).…”

Section: Influence Of Leachates On Water Permeabilitymentioning

confidence: 99%

“…The results of the measurements conducted by Shan and Lai (2002) are presented in Table 3. Hydraulic conductivity of two types of geosynthetic clay liners (Shan & Lai, 2002 (Table 4). It should be emphasized that there no data related to the action time of many years, as the longest test did not exceed 15 months (Francisca & Glatstein, 2010).…”

Section: Influence Of Leachates On Water Permeabilitymentioning

confidence: 99%

See 2 more Smart Citations

Hydraulic Conductivity and Landfill Construction

Stępniewski¹,

Widomski²,

Horn³

2011

Developments in Hydraulic Conductivity Research

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Section: Influence Of Leachates On Water Permeabilitymentioning

confidence: 99%

Section: Influence Of Leachates On Water Permeabilitymentioning

confidence: 99%

Section: Influence Of Leachates On Water Permeabilitymentioning

confidence: 99%

See 1 more Smart Citation

Hydraulic Conductivity and Landfill Construction

Stępniewski¹,

Widomski²,

Horn³

2011

Developments in Hydraulic Conductivity Research

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“…Numerous laboratory studies have focused on quantifying the hydraulic conductivity of GCLs in contact with various types of permeant liquids containing cations (Alther et al, 1985;Shan and Daniel, 1991;Egloffstein, 1997;Petrov and Rowe, 1997; Petrov et al, 1997 a,b;Quaranta et al, 1997;Ruhl and Daniel, 1997;Shackelford et al, 2000;Egloffstein, 2001;Jo et al, 2001;Vasko et al, 2001;Ashmawy et al, 2002;Shan and Lai, 2002; Kolstad et al, 2004a,b;Lee et al, 2005;Guyonnet et al, 2005;Jo et al, 2005;Benson et al, 2008; Katsumi et al, 2008a,b;Rauen et al, 2008;Touze Foltz et al, 2008;Guyonnet et al, 2009;Johns and Shamrock 2009;Shackelford et al 2010). Hydraulic conductivity tests were conducted either with flexible wall permeameters (ASTM, 2008(ASTM, , 2003 or rigid-wall permeameters such as the oedopermeameters according to NF P 84-705 (AFNOR, 2008).…”

Section: Introductionmentioning

confidence: 99%

Impact of a synthetic leachate on permittivity of GCLs measured by filter press and oedopermeameter tests

Rosin-Paumier

Touze-Foltz

Pantet

2011

Geotextiles and Geomembranes

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Geosynthetic clay liners (GCLs) are used in landfill liner applications due primarily to their low hydraulic conductivity to water. The low hydraulic conductivity of GCLs comes from the structure of the clay in the bentonite. However, the interaction between clay and aggressive liquids may alter the structure of the clay and, thus, result in an increase in the hydraulic conductivity of the GCL. This paper presents the results of a project aimed at evaluating the impact of a synthetic leachate on the structure of four different bentonites used in the manufacturing of GCLs. The preparation of bentonite dispersions increased the interaction between the bentonites and the various liquids. The hydraulic properties of the dispersions also were tested using filter press tests to obtain flow curves. Results of these tests were correlated with the cationic concentration, electrical conductivity and pH of the 2 / 46 dispersions, swell indexes of the bentonite extracted from the GCLs, and permittivities of the intact GCLs determined in oedopermeameter tests. The results showed that one bentonite was more sensitive to the synthetic leachate than the other bentonites. For example, the permittivities of the more sensitive bentonite based on the oedopermeameter tests and filter press tests were respectively 2.11x10 -8 s -1 and 5.6x10 -8 s -1 , whereas the permittivities for other bentonites, including a natural sodium bentonite and two sodium activated calcium bentonites, were respectively 5.7 to 6.5x10 -9 s -1 and 3.2 to 3.5x10 -8 s -1 . The filter press test served as a quick and easy-to-use test to compare the performance of the various bentonites in containing a given liquid. However, the oedopermeameter test or direct permeation test is preferable to filter press tests or fluid loss tests for evaluating the long-term impact of a liquid on a bentonite.Keywords: bentonite, cation exchange, permittivity, synthetic leachate. INTRODUCTIONGeosynthetic clay liners (GCLs) generally consist of a layer of granular or powdered bentonite sandwiched between two geotextiles, linked by needle punching or stitch bonding.Bentonite has been widely studied, and consists of a mixture of minerals, with the predominant mineral being smectite (van Olphen, 1977;Patterson and Murray, 1983).However, the quality of bentonites used in GCLs for landfill applications may vary widely.The smectite mineral imparts to the bentonite its swelling properties and its low hydraulic conductivity. For landfill bottom liner applications in France, sodium bentonite is recommended for use in GCLs, meaning that sodium ions are the predominant exchangeable cations of the bentonite (MEEDDAT, 2008). The existence of sodium as the exchangeable cation may be the result of natural geological processes, as typically the case for Wyoming 3 / 46 sodium bentonites, or the result of an activation process whereby naturally occurring calcium bentonite is mixed with soda ash to force sodium-for-calcium cation exchange. These latter bentonites are often called sodium-activ...

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“…However, basic performance and fundamental factors in addition to estimating the performance in the peculiar conditions of a waste containment facility must be considered when designing a bottom liner system. Many researchers have studied the performance of GCLs in a laboratory setting; for example, the hydraulic and mechanical behavior involved in overlapping and partial deformation (Barroso et Shan and Lai, 2002), and so on. Although most of these reports focus on the performance evaluation of the GCLs themselves, few reports investigate the eŠects of geological and hydrological conditions in actual sites on the performance of the GCLs.…”

Section: Introductionmentioning

confidence: 99%