Effect of Wet–Dry Cycles and Cation Exchange on Gas Permeability of Geosynthetic Clay Liners

Bouazza, Abdelmalek; Vangpaisal, Thaveesak; Jefferis, Stephan A.

doi:10.1061/(asce)1090-0241(2006)132:8(1011)

Cited by 51 publications

(30 citation statements)

References 14 publications

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“…Cyclic temperatures and associated wet/dry and freeze/thaw cycles also have adverse effects on earthen barriers including low permeability soil liners and geosynthetic clay liners ͑GCLs͒. Cracking of the barriers that occurs due to these effects results in increases in flow of fluids as demonstrated in several studies ͑Benson and Othman 1993; Benson et al 1995;Albrecht and Benson 2001;Bouazza et al 2006͒. In addition, thermal gradients cause coupled moisture transfer and lead to desiccation cracking of soil liners and GCLs ͑Doll 1997; Southen and Rowe 2005͒.…”

Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Cover Systems in Municipal Solid Waste Landfills

Yeşiller

Hanson

Oettle

et al. 2008

J. Geotech. Geoenviron. Eng.

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Cover temperature variations were determined at four municipal solid waste landfills located in different climatic regions in North America: Michigan, New Mexico, Alaska, and British Columbia. Cover temperatures varied seasonally similarly to air temperatures and demonstrated amplitude decrement and phase lag with depth. Elevated temperatures in the underlying wastes resulted in warmer temperatures and low frost penetration in the covers compared to surrounding subgrade soils. The ranges of measured temperatures decreased and average temperatures generally increased ͑approximately 2°C / m͒ with depth. The ranges of measured temperatures ͑T max − T min ͒ were 18-30°C and 13-21°C and the average temperatures were 13-18°C and 14-23°C at 1 and 2 m depths, respectively. For soil and geosynthetic barrier materials around 1 m depth, the maximum and minimum temperatures were 22-25°C and 3-4°C, respectively. Frost depths were determined to be approximately 50% of those for soils at ambient conditions. The main direction of heat flow in the covers was upward ͑negative gradients͒. The cover gradients varied between −18 and 14°C / m, with averages of −7 to 1°C/ m. The gradients for soil and geosynthetic barrier materials around 1 m depth varied between −11 and 9°C / m with an average of −2°C/ m. Cover thawing n-factors ranged between 1.0 and 1.4 and the cover freezing n-factor was 0.6. Design charts and guidelines are provided for cover thermal analyses for variable climatic conditions.

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Section: Introductionmentioning

confidence: 99%

Thermal Analysis of Cover Systems in Municipal Solid Waste Landfills

Yeşiller

Hanson

Oettle

et al. 2008

J. Geotech. Geoenviron. Eng.

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“…When the seasons change and the bentonite is subjected to dry summers on an annual basis, the bentonite, subsequent to repeated wet-dry cycles, may progressively become more brittle, less plastic, and thus swell less when hydrated in the next rainy season. (Lin and Benson 2000, Bouazza et al 2006, 2007. Cation exchange coupled with wet-dry cycling will makes the GCL more permeable because the particles will not swell as much and desiccation cracks will be present (Lin and Benson 2000, Bouazza et al 2006, 2007.…”

Section: Cation Exchange In Gclsmentioning

confidence: 99%

“…(Lin and Benson 2000, Bouazza et al 2006, 2007. Cation exchange coupled with wet-dry cycling will makes the GCL more permeable because the particles will not swell as much and desiccation cracks will be present (Lin and Benson 2000, Bouazza et al 2006, 2007.…”

Section: Cation Exchange In Gclsmentioning

confidence: 99%

“…However, these tests were conducted to determine the effects of cation exchange and therefore a high concentration was necessary to ensure that cation exchange occurred within the 20 cycle testing period. Tests at or above this concentration have been conducted by Lee and Shackelford (2005) and Bouazza et al (2006Bouazza et al ( , 2007 in order to test the effects of cation exchange in an accelerated time frame. Specimens were wetted with their selected permeant liquid type throughout the duration of the tests.…”

Section: Permeant Type Testsmentioning

confidence: 99%

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Dimensional Stability of Geosynthetic Clay Liners in Landfill Applications

Olsen¹

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“…This ageing simulation may in fact induce degradation of conventional clay materials [8,13,25,44,77], but also on modified clays such MSB and DPH GCL [54].…”

Section: Wet and Dry Ageing With Seawatermentioning

confidence: 99%

Modified clays for barriers: a review

Emidio

Verástegui-Flores

Mazzieri

et al. 2017

Innov. Infrastruct. Solut.

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The aim of this Specialized Lecture is to present the recent advances and issues, as well as original research, on Modified Clays for Barriers. Topics of interest include:(1) long-term hydraulic performance of modified clays for GCLs, (2) chemico-osmotic and diffusion efficiency of modified clays, (3) modeling coupled chemical-hydraulicmechanical behavior of modified clays, (4) wet and dry ageing of modified clays, (5) use of novel bentonites for vertical barrier applications, and (6) organoclays for various barrier applications. In addition, the possible reuse of dredged sediments after polymer treatment will also be discussed. Environmental management and handling of dredged sediments are important worldwide because enormous amounts of dredged material emerge from maintenance, construction and remedial works within water systems. Usually these materials after temporary upland disposal in lagoons are disposed in landfills. The aim of this study is to analyse the possible reuse of these sediments as a low-cost alternative material for landfill covers. The mechanisms through which polymers can improve the efficiency of dredged sediments for waste containment low permeable barriers are discussed.

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Effect of Wet–Dry Cycles and Cation Exchange on Gas Permeability of Geosynthetic Clay Liners

Cited by 51 publications

References 14 publications

Thermal Analysis of Cover Systems in Municipal Solid Waste Landfills

Thermal Analysis of Cover Systems in Municipal Solid Waste Landfills

Dimensional Stability of Geosynthetic Clay Liners in Landfill Applications

Modified clays for barriers: a review

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