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Accelerated swell testing of artificial sulfate bearing lime stabilised cohesive soils

Buttress, A. J.; Grenfell, J.R.A.; Airey, Gordon

Authors

J.R.A. Grenfell james.grenfell@nottingham.ac.uk

GORDON AIREY GORDON.AIREY@NOTTINGHAM.AC.UK
Professor of Pavement Engineering Materials



Abstract

This paper reports on the physico-chemical response of two lime stabilised sulfate bearing artificial soils subject to the European Accelerated Volumetric Swell Test (EN13286-49). At various intervals during the test, a specimen was removed and subject to compositional and microstructural analysis. Ettringite was formed by both soils types, but with significant differences in crystal morphology. Ettringite crystals formed from kaolin based soils were very small, colloidal in size and tended to form on the surface of other particles. Conversely, those formed from montmorillonite were relatively large and typically formed away from the surface in the pore solution. It was concluded that the mechanism by which ettringite forms is determined by the hydroxide ion concentration in the pore solution and the fundamental structure of the bulk clay. In the kaolin soil, ettringite forms by a topochemical mechanism and expands by crystal swelling. In the montmorillonite soil, it forms by a through-solution mechanism and crystal growth.

Journal Article Type Article
Publication Date 2015-11
Journal Materials and Structures
Print ISSN 1359-5997
Electronic ISSN 1871-6873
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 48
Issue 11
Pages 3635-3655
APA6 Citation Airey, G. D., Grenfell, J. A., Buttress, A. J., Grenfell, J., & Airey, G. (2015). Accelerated swell testing of artificial sulfate bearing lime stabilised cohesive soils. Materials and Structures, 48(11), 3635-3655. https://doi.org/10.1617/s11527-014-0428-y
DOI https://doi.org/10.1617/s11527-014-0428-y
Keywords Soil stabilisation, Ettringite, Deleterious, Swell testing, Volumetric
Publisher URL http://link.springer.com/article/10.1617%2Fs11527-014-0428-y
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information The final publication is available at Springer via http://dx.doi.org/10.1617/s11527-014-0428-y

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Adam%20Buttress%20Accelerated%20Swell%20testing%20of%20Artificial%20Sulfate%20Bearing%20Lime%20Stabilised%20Cohesive%20Soils%20Revision_2[1].pdf (3.1 Mb)
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf



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