Evaluation of a geosynthetic clay liner water retention curve using vapour equilibrium technique

Rouf, M. A.; Singh, Rao Martand; Bouazza, Abdelmalek; Gates, Will P.; Rowe, R. Kerry

doi:10.1201/b17034-145

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…A limited number of studies have been carried out over the last decade on the water retention behaviour of GCLs using different suction measurement techniques (Abuel-Naga & Bouazza, 2010;Beddoe et al, 2010Beddoe et al, , 2011Bannour et al, 2014;Rouf et al, 2014). Among these techniques, the contact filter paper test (CFPT) is attractive owing to its simplicity and accessibility, but has been used with limited success, primarily related to the accuracy of the suction measurements (Barroso et al, 2006;Acikel et al, 2011).…”

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confidence: 99%

Applicability and accuracy of the initially dry and initially wet contact filter paper tests for matric suction measurement of geosynthetic clay liners

et al. 2015

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An initially wet contact filter paper test (IW-CFPT) and an initially dry contact filter paper test (ID-CFPT) were used to examine the wetting paths of geosynthetic clay liners, including non-contact filter paper tests for comparative purposes. The CFPTs were applied to both geosynthetic clay liner faces to examine the effect of geotextile type on capillary contact. The non-woven geotextile face was found to be more likely to cause capillary breaks than the woven geotextile face. Both IW-and ID-CFPTs were found to be applicable to geosynthetic clay liners within their accurate upper matric suction measurement limits of 146 kPa and 66 kPa, respectively.

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Section: Introductionmentioning

confidence: 99%

Applicability and accuracy of the initially dry and initially wet contact filter paper tests for matric suction measurement of geosynthetic clay liners

et al. 2015

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Back-analysis of the water retention curve of a GCL on the wetting path

Tincopa

Bouazza

Rowe

et al. 2020

Geosynthetics International

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A new approach is presented to obtain the water retention curve of a geosynthetic clay liner (GCL) on the wetting path (i.e. when it is hydrating). This approach is based on a back-analysis process using data from a hydration test. The back-analysis method was validated by comparing it to conventional experimental measurement techniques such as vapour equilibrium, chilled-mirror dew point and osmotic techniques as well as published data. This approach is shown to be a viable alternative to quickly identify the retention properties of a GCL on the wetting path.

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Air and hydraulic flow characteristics of polymer amended bentonite based unsaturated GCLs

Rajesh

Jain

2022

Geosynthetics International

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Geosynthetic clay liners (GCLs) are used in landfill applications because of their high deformation resistance and excellent self-healing ability. In the present study, air and hydraulic flow characteristics of natural bentonite based GCL (GCL-N) and polymer amended bentonite based GCL (GCL-A) were assessed using air permeability and hydraulic conductivity measurements. The airflow characteristics of GCLs were studied at various apparent degrees of saturation (Sa) and corresponding suction using a custom-designed air permeability test setup. The effect of desiccation on the airflow characteristics of GCL-A was also examined. Further, hydraulic flow characteristics of virgin and desiccated-rehydrated GCLs were assessed using a flexible wall permeameter. The water absorption capacity of GCL-A is relatively higher than GCL-N, irrespective of the stress state. For any chosen Sa, air permeability of GCL-A is lower than GCL-N. Moreover, with the decrease in the suction from 2500 kPa to 1000 kPa, the air permeability of virgin GCL-A has reduced from 9 × 10−12 m2 to 3.57 × 10−16 m2 while the desiccated-rehydrated GCL-A has reduced from 8.86 × 10−11 m2 to 1.9 × 10−13 m2. The hydraulic conductivity of GCL-A is two orders of magnitude less than GCL-N, which shows the better performance of GCL made with amended bentonite.

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Evaluation of a geosynthetic clay liner water retention curve using vapour equilibrium technique

Cited by 3 publications

References 17 publications

Applicability and accuracy of the initially dry and initially wet contact filter paper tests for matric suction measurement of geosynthetic clay liners

Applicability and accuracy of the initially dry and initially wet contact filter paper tests for matric suction measurement of geosynthetic clay liners

Back-analysis of the water retention curve of a GCL on the wetting path

Air and hydraulic flow characteristics of polymer amended bentonite based unsaturated GCLs

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