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An alternative approach to determine suction of aqueous polyethylene glycols for laboratory testing of unsaturated soils

Lieske, W., Tripathy, S., Baille, W. and Schanz, T. 2019. An alternative approach to determine suction of aqueous polyethylene glycols for laboratory testing of unsaturated soils. Géotechnique Letters 9 (4) 10.1680/jgele.19.00017

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Abstract

Determination of suction of Polyethylenglycol (PEG) is vital for unsaturated laboratory testing that use osmotic technique to study the hydro-mechanical behaviour of fine-grained soils. To date, suctions of PEG solutions are either experimentally measured or calculated from established semi-empirical relationships between concentration of PEG and suction. The current paper presents an alternative approach to determine suctions of aqueous PEG solutions based on a modified Flory-Huggins equation. Using the proposed method, suctions of various PEGs can be precisely calculated by knowing the average molar mass, concentration of the solution and an interaction coefficient which represents the quality of PEG-solvent interaction. The suggested method relies on the characteristics and thermodynamical behaviour of PEGs in solution. Experimental data of several PEG-water mixtures reported in the literature were analysed. The superiority of the current approach remains with abilities to verify molar of mass of PEGs and estimate suctions of PEG at high concentrations.

Item Type: Article
Date Type: Published Online
Status: In Press
Schools: Engineering
Publisher: Thomas Telford (ICE Publishing)
ISSN: 2045-2543
Date of First Compliant Deposit: 29 July 2019
Date of Acceptance: 5 July 2019
Last Modified: 18 Oct 2019 16:38
URI: http://orca.cf.ac.uk/id/eprint/124574

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