Osmotic Oedometer Using Sodium Chloride Solution and Reverse Osmosis Membrane

Bulolo, Sam; Leong, Eng Choon

doi:10.1520/gtj20190403

Cited by 2 publications

(1 citation statement)

References 57 publications

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“…One such device is an oedometer pressure plate device (OPPD), which uses axis-translation suction-control methods [45]. Other suction-controlled oedometers include osmotic suctioncontrol and high capacity tensiometer measurement methods [66][67][68][69]. Suction-controlled oedometer devices are rarely used for routine foundation design problems.…”

Section: Use Of the Oppd -An Approach For Shrink/swell And Collapse R...mentioning

confidence: 99%

A Unified Two Independent Stress Variable Approach to Moisture-Change-Induced Unsaturated Soil Volume Change

Houston

Zhang

2023

E3S Web of Conf.

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In 1968, Matyas and Radhakrishna introduced the concept of the state surface, demonstrating that unsaturated soil volume change is dependent on two independent stress state variables, net total stress and suction. For decades the basic theory of unsaturated soils has been known, and a holistic view of the elastoplastic response of unsaturated soils, based on a modified state surface approach (MSSA), makes it clear that a method accounting for independent roles of net total stress and suction is required to quantify volume change of unsaturated soils. Still, reliance on pre-unsaturated-soil-mechanics-era methods persists, particularly within the geotechnical practice community. Unsaturated soil theory forms the basis for compelling arguments for discarding long-held efforts to classify unsaturated soils as exclusively expansive or exclusively collapsible with respect to volume change response. A more fundamental and unified approach to thinking about volume change of unsaturated soils supports the use of a consistent Stress Path Method to practice-based volume change analyses. Implications of geotechnical engineers’ continued reliance on expansive and collapsible soil classifications, often based on index-based correlations and non-stress-path appropriate laboratory testing, are explored. Recommendations for laboratory testing and modeling for moisture-change induced unsaturated soil volume change are made.

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Section: Use Of the Oppd -An Approach For Shrink/swell And Collapse R...mentioning

confidence: 99%

A Unified Two Independent Stress Variable Approach to Moisture-Change-Induced Unsaturated Soil Volume Change

Houston

Zhang

2023

E3S Web of Conf.

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Polyethylene glycol and membrane processes applied to suction control in geotechnical osmotic testing

Vandoorne

Gräbe

Heymann

2021

International Journal of Geotechnical Engineering

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The osmotic technique in geotechnical testing of unsaturated soils is a promising technique to control soil-water potential. This technique is sometimes used as an alternative to the axistranslation technique. In this technique an aqueous polyethylene glycol (PEG) solution is interfaced with a selectively permeable membrane. The geotechnical literature has regularly referred to membrane effects which tend to reduce the achieved matric suction in relation to that theoretically attainable by consideration of the osmotic pressure of the bulk PEG solution. In this review, the literature on membrane science is studied in order to identify potential causes for these membrane effects. It is clear that consideration of the effects of concentration polarisation, membrane fouling and reverse solute draw has not been adequately considered or discussed in the geotechnical literature. A better understanding of membrane science and its application to geotechnical osmotic testing can aid in the optimisation of osmotic testing and the systematic improvement of the technique.

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Osmotic Oedometer Using Sodium Chloride Solution and Reverse Osmosis Membrane

Abstract: Osmotic oedometer using sodium chloride solution and reverse osmosis membrane

Cited by 2 publications

References 57 publications

A Unified Two Independent Stress Variable Approach to Moisture-Change-Induced Unsaturated Soil Volume Change

A Unified Two Independent Stress Variable Approach to Moisture-Change-Induced Unsaturated Soil Volume Change

Polyethylene glycol and membrane processes applied to suction control in geotechnical osmotic testing

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