Influence of calcium and silica on hydraulic properties of sodium montmorillonite assemblages under alkaline conditions

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dc.contributor.authorKinsela, ASen_AU
dc.contributor.authorTjitradjaja, Aen_AU
dc.contributor.authorCollins, RNen_AU
dc.contributor.authorWaite, TDen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorMacdonald, BCTen_AU
dc.contributor.authorWhite, Ien_AU
dc.date.accessioned2010-04-20T01:53:14Zen_AU
dc.date.accessioned2010-04-30T05:09:40Zen_AU
dc.date.available2010-04-20T01:53:14Zen_AU
dc.date.available2010-04-30T05:09:40Zen_AU
dc.date.issued2010-03-01en_AU
dc.date.statistics2010-03-01en_AU
dc.description.abstractA sodium-washed montmorillonite was exposed to calcium and silica under alkaline conditions in order to gain insight into possible interactions of engineered clay barriers and cementitious leachates found in many waste storage facilities. The changes in physico-chemical properties of the material were investigated using a combination of dead-end filtration, electrophoresis and scanning electron microscopy. The results show minimal differentiation between unaltered Na-montmorillonite samples at the two pH values tested (9 and 12), with the structure of the resulting assemblages arising from repulsive tactoid interactions. The addition of calcium (50 mM) greatly decreases the size of the structural network, and in doing so, increases the hydraulic conductivity ~65-fold, with the effect being greatest at pH 12. Whilst the addition of silica alone (10 mM) produced little change in the hydraulic properties of montmorillonite, its combined effect with calcium produced alterations to the structural assemblages that could not be accounted for by the presence of calcium alone. The likely binding of calcium with multiple silanol groups appears to enhance the retention of water within the Na-montmorillonite assemblage, whilst still allowing the fluent passage of water. The results confirm that polyvalent cations such as Ca2+ may have a dramatic effect on the structural and hydraulic properties of montmorillonite assemblages while the effects of solutions containing both silicate and calcium are complex and influenced by silica–cation interactions. © 2010, Elsevier Ltd.en_AU
dc.identifier.citationKinsela, A. S., Tjitradjaja, A., Collins, R. N., Waite, T. D., Payne, T. E., Macdonald, B. C. T., & White, I. (2010). Influence of calcium and silica on hydraulic properties of sodium montmorillonite assemblages under alkaline conditions. Journal of Colloid and Interface Science, 343(1), 366-373. doi:10.1016/j.jcis.2009.10.044en_AU
dc.identifier.govdoc1622en_AU
dc.identifier.issn0021-9797en_AU
dc.identifier.issue1en_AU
dc.identifier.journaltitleJournal of Colloid and Interface Scienceen_AU
dc.identifier.pagination366-373en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jcis.2009.10.044en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3242en_AU
dc.identifier.volume343en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectSilicaen_AU
dc.subjectClaysen_AU
dc.subjectCalciumen_AU
dc.subjectHydraulic conductivityen_AU
dc.subjectMontmorilloniteen_AU
dc.subjectSodiumen_AU
dc.titleInfluence of calcium and silica on hydraulic properties of sodium montmorillonite assemblages under alkaline conditionsen_AU
dc.typeJournal Articleen_AU
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