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|Use of synthesised polymers for the development of new osmotic tensiometers
|Liu, H., Rahardjo, H., Satyanaga, A. & Du, H. (2022). Use of synthesised polymers for the development of new osmotic tensiometers. Géotechnique. https://dx.doi.org/10.1680/jgeot.21.00108
|Compared 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.
|School of Civil and Environmental Engineering
School of Mechanical and Aerospace Engineering
Interdisciplinary Graduate School (IGS)
|Nanyang Environment and Water Research Institute
Environmental Process Modelling Centre
|© 2021 ICE Publishing. All rights reserved. This paper was published in Géotechnique and is made available with permission of ICE Publishing.
|Appears in Collections:
|CEE Journal Articles
IGS Journal Articles
MAE Journal Articles
NEWRI Journal Articles
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