Change search
ReferencesLink to record
Permanent link

Direct link
Free porosity investigation of compacted Bentonite using XRD
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Nuclear Chemistry.ORCID iD: 0000-0003-0663-0751
(English)In: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053Article in journal (Other academic) Submitted
Abstract [en]

Many countries intend to use compacted bentonite as abarrier in their deep geological repositories for nuclearwaste. In order to describe and predict hydraulicconductivity or radionuclide transport through thebentonite barrier, fundamental understanding of themicrostructure of compacted bentonite is needed. Thisstudy examined the interlayer swelling and overallmicrostructure of Wyoming Bentonite MX-80 and thecorresponding homo-ionic Na+ and Ca2+ forms, usingXRD with samples saturated under confined swellingconditions and free swelling conditions. For thesamples saturated under confined conditions, theinterparticle, or so-called free porosity was estimatedby comparing the experimental interlayer distancesobtained from one-dimensional XRD profile fittingagainst the maximum interlayer distances possible forthe corresponding water content. The results showedthat interlayer porosity dominated total porosity,irrespective of water content, and that free porositywas lower than previously reported in the literature. Atcompactions relevant for the saturated bentonitebarrier (1.4-1.8 g/cm3), the free porosity was estimatedto ≤ 3%.

Keyword [en]
Bentonite, clay swelling, Microstructure, porosity, Nuclear Waste disposal, XRD
National Category
Chemical Sciences
URN: urn:nbn:se:kth:diva-34044OAI: diva2:418865
QS 2011 QS 20120327Available from: 2011-06-08 Created: 2011-05-24 Last updated: 2012-03-27Bibliographically approved

Open Access in DiVA

Article 2(11597 kB)5218 downloads
File information
File name FULLTEXT01.pdfFile size 11597 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Holmboe, MichaelWold, SusannaJonsson, Mats
By organisation
Nuclear Chemistry
In the same journal
Applied Clay Science
Chemical Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 5218 downloads
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

Total: 118 hits
ReferencesLink to record
Permanent link

Direct link