First saturation and resaturation of high capacity tensiometers with 1.5 MPa high air entry value (HAEV) ceramic filters
Mendes, J. and Gallipoli, D. and Toll, D.G. and Tarantino, A.; Hoyos, Laureano R. and McCartney, John S. and Houston, Sandra L. and Likos, William J., eds. (2018) First saturation and resaturation of high capacity tensiometers with 1.5 MPa high air entry value (HAEV) ceramic filters. In: PanAm Unsaturated Soils 2017. American Society of Civil Engineers (ASCE), USA, pp. 514-522. ISBN 9780784481684 (https://doi.org/10.1061/9780784481684.052)
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Abstract
High Capacity Tensiometers, or HCTs, are sensors that can measure negative pore water pressures (soil suctions) between -1.5 and -2 MPa. To achieve such measured values, HCTs first need to be fully saturated by water. For the first saturation of an initially dry HCT, the most common procedure involves application of vacuum followed by forced flooding by pressurised water. Instead, for the resaturation of a HCT that has cavitated (and is therefore still water flooded), only application of water pressure is necessary. Typically, the procedures for the first saturation and resaturation of HCTs can last days or weeks, which hinders adoption of these devices by the geotechnical industry. In this paper, faster procedures are presented for both first saturation and resaturation of HCTs built with 1.5 MPa air entry value filters. The duration of the first saturation can be reduced to less than 24 hours if high vacuum is first applied to the ceramic filter followed by water pressurisation at about twice the air entry value of the filter. Even more, resaturation of a cavitated HCT can be achieved in less than 10 minutes by simple water pressurisation of the ceramic filter. This is however true only if the HCT is not left to dry out to the atmosphere completely and is submerged in water just after cavitation.
ORCID iDs
Mendes, J., Gallipoli, D., Toll, D.G. and Tarantino, A. ORCID: https://orcid.org/0000-0001-6690-748X; Hoyos, Laureano R., McCartney, John S., Houston, Sandra L. and Likos, William J.-
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Item type: Book Section ID code: 65482 Dates: DateEvent20 June 2018Published22 September 2017AcceptedNotes: This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://doi.org/10.1061/9780784481684.052. Subjects: Technology > Engineering (General). Civil engineering (General) Department: Faculty of Engineering > Civil and Environmental Engineering Depositing user: Pure Administrator Date deposited: 19 Sep 2018 10:26 Last modified: 01 Oct 2024 00:11 Related URLs: URI: https://strathprints.strath.ac.uk/id/eprint/65482