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dc.contributor.authorLiu, Hengshuoen_US
dc.contributor.authorRahardjo, Hariantoen_US
dc.contributor.authorSatyanaga, Alfrendoen_US
dc.contributor.authorDu, Hejunen_US
dc.identifier.citationLiu, H., Rahardjo, H., Satyanaga, A. & Du, H. (2022). Use of synthesised polymers for the development of new osmotic tensiometers. Géotechnique.
dc.description.abstractCompared with conventional water-filled tensiometers, polymer-filled osmotic tensiometers (OTs) can measure a higher matric suction by increasing the osmotic pressure of the water inside the tensiometer. The measuring range of OT is equal to the osmotic pressure of water inside the OT. All previous research used commercial polymers in developing OTs and the mechanism of long-term pressure decay of OTs was not found. In this study, polymers including polyacrylamide (PAM) and sodium polyacrylate (NaPA) with different degrees of crosslinking were synthesised by UV polymerisation to develop new OTs. Long-term pressure variations of OTs indicated that the pressure decay was more likely due to the stress relaxation of polymer materials instead of polymer leakage. PAM-filled OTs have a faster stress relaxation behaviour than NaPA-filled OTs so that they can keep constant pressure (i.e., constant measuring range) for a long time and there is no need for pressure correction based on the pressure decay rate. However, the measuring range of PAM-filled OTs is lower than that of NaPA-filled OTs. The result of matric suction measurements demonstrated that the proposed OTs can be used to measure matric suction both in low and high ranges with fast response and high accuracy.en_US
dc.description.sponsorshipNanyang Technological Universityen_US
dc.description.sponsorshipNational Parks Boarden_US
dc.rights© 2021 ICE Publishing. All rights reserved. This paper was published in Géotechnique and is made available with permission of ICE Publishing.en_US
dc.subjectEngineering::Environmental engineeringen_US
dc.titleUse of synthesised polymers for the development of new osmotic tensiometersen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Civil and Environmental Engineeringen_US
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.researchNanyang Environment and Water Research Instituteen_US
dc.contributor.researchEnvironmental Process Modelling Centreen_US
dc.description.versionSubmitted/Accepted versionen_US
dc.subject.keywordsField Instrumentationen_US
dc.description.acknowledgementThe authors would like to acknowledge the financial support from Nanyang Environment and Water Research Institute (NEWRI), Interdisciplinary Graduate School, Nanyang Technological University, Singapore, as well as the National Parks Board, Singapore.en_US
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