Change search
ReferencesLink to record
Permanent link

Direct link
Prediction of swelling pressures of different types of bentonite in dilute solutions
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Chemical Engineering.
2013 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, Vol. 434, 303-318 p.Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
2013. Vol. 434, 303-318 p.
Keyword [en]
Bentonite, Bentonite/sand mixtures, Mechanistic model, Swelling pressure, Water retention curve
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-126037DOI: 10.1016/j.colsurfa.2013.05.068ISI: 000322418400040ScopusID: 2-s2.0-84879509717OAI: diva2:641814

QC 20130819

Available from: 2013-08-19 Created: 2013-08-19 Last updated: 2013-09-06Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Liu, Longcheng
By organisation
Chemical Engineering
In the same journal
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 43 hits
ReferencesLink to record
Permanent link

Direct link