...S. Taheri; A. El-Zein; B. Yu Desiccation-induced cracks in reactive soils reduce their mechanical strength and increase their hydraulic conductivity (HC). Polymer additives have demonstrated efficacy in improving the resistance of clay against desiccation cracking and retaining low HC when exposed...

...A. Norris; J. Scalia IV; C. D. Shackelford The hydraulic conductivity (k) of specimens of enhanced-bentonite geosynthetic clay liners (EB-GCLs) comprising anionic polymers permeated with two concentrated salt solutions, 500 mM NaCl and 167 mM CaCl₂, was measured to determine...

... with a hole. The wetting involved water flowing over the GCL for 8 h each cycle. Three drying cycles (0.67, 7, and 14 days) were examined. After 12–18 months of wet–dry cycles, the samples were X-rayed to identify representative specimens for testing. The changes in the hydraulic conductivity, k...

... 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 (S_a) and corresponding suction using a custom-designed air permeability test setup. The effect...

... smaller than that of the corresponding virgin GCLs. GCLs with powdered bentonite with an initial SI of 32 ml/2 g generally self-healed better and the intact specimens had a lower hydraulic conductivity than GCLs with granular bentonite with an initial SI of 24–26 ml/2 g. Higher mass per unit area...

...K.-H. Yang; W. M. Adilehou; S.-T. Jian; S.-B. Wei A series of upward seepage tests on unreinforced and reinforced sand specimens was conducted to investigate the influence of soil density and fibre parameters (i.e. fibre contents and lengths) on the piping failure mode, hydraulic conductivity...

... bentonite prehydration with a polymer solution and vacuum extrusion. This paper describes the results of permeability tests that were carried out using flexible-wall permeameters to investigate the hydraulic conductivity of a DPH GCL to water, natural seawater and a 12.5 mmol/l CaCl₂ solution...

... the interface between each GCL product and a 0.1 m thick cast-in-place concrete above the GCL over a 14-month period and, from this data, calculating the concrete/GCL interface transmissivity (θ); and (ii) the hydraulic conductivity (k) of the GCLs below poured concrete when exposed...

...). Despite this reduction in the swelling capacity, the maximum measured hydraulic conductivity (k) for this GCL was 1 × 10⁻¹⁰ m/s, which is still considered low. The GCLs with polymer-enhanced bentonite experienced less cation exchange (ESP = 10–27% in the field and 17–53...

... before becoming clogged. Predicting the hydraulic conductivity of the filter throughout the filter lifespan is one way in which the duration of use can be determined. In this study, a semi-theoretical model was developed which predicts the hydraulic conductivity of the filter system as a function...

... of laboratory falling-head dewatering column tests using two reservoir sediment slurries and four woven geotextile filters. Analytical results also show that the hydraulic conductivity of the soil cakes plays a key role, their compressibility plays a secondary role, and the permeability of the geotextile...

... of knowledge regarding the hydraulic properties of porous geosynthetics under unsaturated conditions relevant for geosynthetic capillary barrier design. These properties include the water retention curve and the hydraulic conductivity function. In addition, the mechanisms involved in the development...

...R. K. Rowe; P. Hurst; T. Mukunoki The hydraulic conductivity of hydrated and partially hydrated geosynthetic clay liners (GCLs) with respect to Jet Fuel A-1 (Arctic diesel) is examined at −20°C, −5°C, 5°C, and 20°C. Methods developed to hydrate GCLs to specific water contents (60%, 90%, 120...

... © 2004 Thomas Telford Ltd 2004 Geosynthetics Geosynthetic clay liner Geomembrane Bentonite Flow Liquid Water Migration Hydration Leakage Defect Containment Liner system Barrier Hydraulic conductivity In the analyses presented in Sections 2 and 3 of this paper...

... the suction at the hydration front. This paper presents an analytical method to evaluate the extent of the hydrated area of the bentonite layer as a function of: time, the initial and hydrated moisture content of the bentonite, the hydraulic conductivity of the bentonite, the overlap width, the distance...

...D. C. Kolstad; C. H. Benson; T. B. Edil; H. Y. Jo A series of swell and hydraulic conductivity tests were conducted with aggressive aqueous solutions (1 M CaCl₂, 1 M NaCl, HCl solution with pH 1.2, and NaOH solution with pH 13.1) and deionised water (DI) on two GCLs. One GCL is moistened...

..., the hydraulic conductivities of the two layers, the length of the drainage system, and the slope. Design examples are presented. 24 06 2001 29 01 2004 01 02 2004 © 2004 Thomas Telford Ltd 2004 Geosynthetics Geocomposite Geonet Flow Liquid Water Leachate Two layers Drainage...

... with a bentonite and kaolinite mixture on a biodegradable jute base is discussed in the present paper. The hydraulic conductivity and consolidation behaviour of bentonite: kaolinite mixtures was investigated. It was revealed that at least 30% bentonite was required in the mixture to result in the same decreasing...

... of time. Geosynthetic Geonet Geotextile Thickness Hydraulic transmissivity Hydraulic conductivity Theoretical Reduction factor Technical Paper by J.P. Giroud, A. Zhao, and G.N. Richardson EFFECT OF THICKNESS REDUCTION ON GEOSYNTHETIC HYDRAULIC TRANSMISSIVITY ABSTRACT: A new theoretical...

.... A theoretical analysis described in the present paper shows that, in the case of unconfined flow (which is the usual design case), two liquid collection layers that have different thicknesses and hydraulic conductivities (such as granular and geosynthetic liquid collection layers) cannot have the same flow...