Soil-water characteristic curves of clays

Tripathy, Snehasis; Tadza, Mohd Yuhyi Mohd; Thomas, Hywel Rhys

doi:10.1139/cgj-2013-0089

Cited by 73 publications

(29 citation statements)

References 30 publications

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“…The osmotic tests results at the overlapping suction region were found to remain lower than that of water contents obtained from vapour equilibrium. Similar observation was reported by Tripathy et al [10] for other types of bentonites. The lower water contents are primarily attributed to the intrusion of PEG solution into the bentonites specimens.…”

Section: Suction-water Content Swccsupporting

confidence: 91%

“…The physical and microbiological properties of the Andrassy bentonite was first determined following standard laboratory procedures described in [10] [14]. The microbiological properties of the bentonite, namely bacteria and fungi determination were carried out following plating, slide culture, streaking and isolation techniques [19].…”

Section: Determination Of Geotechnical and Microbiological Propertiesmentioning

confidence: 99%

“…shear strength, volume change, permeability) due to changes in the water content are commonly predicted by establishing the suction-water content soil-water characteristic curves (SWCCs). In the laboratory, the suction-water content SWCCs are commonly established using various techniques to predict the changes in the water content in soils [9] [10]. Recently, the vapour equilibrium and osmotic techniques have gained widespread acceptance as reliable methods for controlling suction in soil specimens [11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Evaluation of Osmotic Technique Under Ultraviolet Germicidal Irradiation Exposure

Tadza¹

2017

GEOMATE

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ABSTRACT:The osmotic technique, which uses polyethylene glycol (PEG) solutions of varying concentrations with semipermeable membranes of different molecular weight cutoffs (MWCO), is commonly used to apply suction in soils. Cellulose acetate membranes which are most commonly used, are susceptible to microbial attacks. This in turn will lead to the intrusion of PEG into soil specimens. Osmotic and vapour equilibrium techniques are often used to establish drying suction-water content soil-water characteristic curves (SWCC). In this study, suctions of 0.11 to 300 MPa were applied on Andrassy bentonite slurries. At higher applied suctions, the osmotic tests were carried under short length ultraviolet germicidal irradiation (UVGI). In addition, Atomic Force Microscopy (AFM) and Fourier Infrared (FTiR) were employed to evaluate the changes in the semipermeable membranes and PEG molecules, respectively. The water content of the clay obtained from the osmotic tests was found to be greater at the overlapping suction region. Interestingly, under UVGI exposure, the water content was found to be in good agreement with the water content determined using the osmotic technique at low suctions and the vapour equilibrium technique at higher suctions. FTiR spectrum and AFM results revealed that some changes had occurred on both the PEG and in the membrane pore sizes. However, these changes did not affect the final water content in the bentonite and therefore, more precise suction-water content SWCC for the clay could be established.

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Section: Suction-water Content Swccsupporting

confidence: 91%

Section: Determination Of Geotechnical and Microbiological Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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An Evaluation of Osmotic Technique Under Ultraviolet Germicidal Irradiation Exposure

Tadza¹

2017

GEOMATE

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“…Suctions obtained with the filter paper technique seem to match the psychrometer results reasonably well (see Table 1), with the biggest difference at very high suction where filter paper measurements are known to be less reliable. Furthermore, it is expected that, on average, the difference between total and matric suction in case of samples saturated with deionised water should be low (as the osmotic suction component should be zero assuming no salt is present in the natural bentonite; very small amounts of salt may be present though [20]). That is indeed confirmed -the average difference between the matric and total suction measurements (for all the samples partially saturated with water) is just 0.083 MPa.…”

Section: Accuracy Of the Resultsmentioning

confidence: 99%

Estimation of water retention behaviour of MX-80 bentonite partially saturated with saline solution

et al. 2016

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Abstract. The water retention behaviour of partially saturated MX-80 bentonite with pure water is relatively well investigated. However, in practical cases, the water contains a number of chemical compounds which affects the bentonite behaviour. In particular, bentonite is used in buffer applications of geological repositories for spent nuclear fuel, where the concentration of total dissolved solids in groundwater is expected to increase significantly with time. This paper investigates water retention behaviour of MX-80 type bentonite partially saturated with deionised water as well as 1M NaCl solution. In the experiments the specific volume of bentonite has been kept approximately constant.

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“…It is anticipated that changes in the pore fluid ionic concentrations would affect the engineering behavior of soils [22][23] [24]. Estabragh et al [25] noted that the magnitude of soil deformation is affected by the water quality.…”

Section: Compressibility Behaviormentioning

confidence: 99%

Treatment Efficiency and Compressibility Behavior of Soil Modified With Powdered Activated Carbon

Tadza¹

2017

GEOMATE

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Riverbank filtration (RBF) systems are often used to treat surface water near rivers. The effectiveness of such systems depends heavily on the properties of the riverbank material that is used for filtering and treating the water. To improve the system's treatment efficiency, modifications may be conducted to the riverbank soil. Altering the properties of the soil might, however, affect the stability of the riverbank. In this study, soil and water samples near Lake Chini were collected and characterized. Filtration test was conducted to evaluate the efficiency of the soil in treating the water. The soil was modified by mixing it with powdered activated carbon (PAC) at varying percentage of 5 and 10%. In addition, compressibility test was carried out using a standard oedometer. Test results indicated that the soil alone was insufficient to treat the water to drinking water quality standards. Modification with activated carbon improved the water quality from Class II to Class I. However, compressibility test revealed that there were some changes to the pressure -void ratio relationship, indicating that the alteration of soil properties with the addition of activated carbon filters might affect the stability of the riverbank.

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Soil-water characteristic curves of clays

Cited by 73 publications

References 30 publications

An Evaluation of Osmotic Technique Under Ultraviolet Germicidal Irradiation Exposure

An Evaluation of Osmotic Technique Under Ultraviolet Germicidal Irradiation Exposure

Estimation of water retention behaviour of MX-80 bentonite partially saturated with saline solution

Treatment Efficiency and Compressibility Behavior of Soil Modified With Powdered Activated Carbon

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