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Prediction of swelling pressures of different types of bentonite in dilute solutions
KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Kemisk apparatteknik.ORCID-id: 0000-0001-6801-9208
2013 (engelsk)Inngår i: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 434, s. 303-318Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A mechanistic model is developed to predict the swelling pressure of fully saturated, bentonite-based materials in distilled water or dilute saline solutions over a large range of final dry densities of bentonite. It applies a thermodynamic relationship between swelling pressure and suction to describe the contribution of crystalline swelling, while using a diffuse double-layer model to explain the behavior of osmotic swelling. In addition, it accounts for the demixing of exchangeable cations and the disintegration of the montmorillonite particles into small stacks of unit layers upon water uptake.Comparison of the model predictions with a great number of experimental results of swelling pressures of different types of bentonites and bentonite-aggregate mixtures in both distilled water and saline solutions suggests that the model works excellently in the cases tested. It is found that the water chemistry, the montmorillonite content, the type and amount of exchangeable cations in the interlayers are important in determining the extent to which the montmorillonite particles are delaminated and hence the swelling behavior of saturated, bentonite-based materials.On the other hand, the applicability of the model in predicting the water retention curves of unsaturated bentonites is also tested. The results show that the predicted curves are in good agreement with the measured data and that the montmorillonite particles are more difficult to disintegrate into small pieces in the case of unsaturated bentonites than would otherwise be possible.

sted, utgiver, år, opplag, sider
2013. Vol. 434, s. 303-318
Emneord [en]
Bentonite, Bentonite/sand mixtures, Mechanistic model, Swelling pressure, Water retention curve
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-126037DOI: 10.1016/j.colsurfa.2013.05.068ISI: 000322418400040Scopus ID: 2-s2.0-84879509717OAI: oai:DiVA.org:kth-126037DiVA, id: diva2:641814
Merknad

QC 20130819

Tilgjengelig fra: 2013-08-19 Laget: 2013-08-19 Sist oppdatert: 2017-12-06bibliografisk kontrollert

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