Deformation and Compression Behaviour of a Cement-Bentonite Slurry for Groundwater Control Applications

Alexander Royal, Alfred Opukumo, Chener Salam Qadr Qadr, Lisa Perkins, Muhammad Walenna

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
148 Downloads (Pure)

Abstract

Cement bentonite (CB) barriers are self-supporting, low permeability, structures used to retard groundwater flow and as such strength and hydraulic conductivity parameters are often stipulated when developing the mixtures. This paper reports an investigation into the deformation and compression behaviour of a CB containing groundgranulated blastfurnace slag using the unconfined compressive strength apparatus, triaxial (undrained, unconsolidated) and oedometer. Samples were also exposed to drying and rewetting to investigate possible response to changes in environmental conditions.

Cracking was observed prior to peak stress suggesting that the hydraulic conductivity of a barrier may be adversely affected before the shear strength is reached in undrained conditions. The compression response of CB indicates the presence of a threshold stress; once exceeded the magnitude of settlements are significantly greater than those encountered below this threshold. If a barrier experiences localised changes in loading conditions then there is the potential for damage from induced differential settlements; thus it is recommended that the threshold stress should also be considered at the design stage in addition to strength and hydraulic conductivity requirements. The response of the material exposed to drying-rewetting was unexpected and requires further investigation to determine how a barrier will respond to changing environmental conditions.
Original languageEnglish
Pages (from-to)1-19
JournalGeotechnical and Geological Engineering
Early online date2 Dec 2017
DOIs
Publication statusE-pub ahead of print - 2 Dec 2017

Keywords

  • cement-bentonite
  • low permeability barrier
  • deformation and compression behaviour

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