@article{Mohd Yuhyi Mohd Tadza_Nurhidayah Mahazam_Snehasis Tripathy_2016, title={AN EVALUATION OF OSMOTIC TECHNIQUE UNDER ULTRAVIOLET GERMICIDAL IRRADIATION EXPOSURE}, volume={12}, url={https://geomatejournal.com/geomate/article/view/1286}, abstractNote={<p>The osmotic technique, which uses polyethylene glycol (PEG) solutions of varying <br>concentrations with semipermeable membranes of different molecular weight cutoffs (MWCO), is commonly <br>used to apply suction in soils. Cellulose acetate membranes which are most commonly used, are susceptible <br>to microbial attacks. This in turn will lead to the intrusion of PEG into soil specimens. Osmotic and vapour <br>equilibrium techniques are often used to establish drying suction-water content soil-water characteristic <br>curves (SWCC). In this study, suctions of 0.11 to 300 MPa were applied on Andrassy bentonite slurries. At <br>higher applied suctions, the osmotic tests were carried under short length ultraviolet germicidal irradiation <br>(UVGI). In addition, Atomic Force Microscopy (AFM) and Fourier Infrared (FTiR) were employed to <br>evaluate the changes in the semipermeable membranes and PEG molecules, respectively. The water content <br>of the clay obtained from the osmotic tests was found to be greater at the overlapping suction region. <br>Interestingly, under UVGI exposure, the water content was found to be in good agreement with the water <br>content determined using the osmotic technique at low suctions and the vapour equilibrium technique at <br>higher suctions. FTiR spectrum and AFM results revealed that some changes had occurred on both the PEG <br>and in the membrane pore sizes. However, these changes did not affect the final water content in the <br>bentonite and therefore, more precise suction-water content SWCC for the clay could be established.</p>}, number={32}, journal={GEOMATE Journal}, author={Mohd Yuhyi Mohd Tadza and Nurhidayah Mahazam and Snehasis Tripathy}, year={2016}, month={Nov.}, pages={30–36} }