Evaluation of the water retention curves of cement- bentonite cut-off wall materials

S. E. Al-Baiaty, A. Bouazza, W. P. Gates

Research output: Contribution to journalArticleResearchpeer-review


Filter Paper, Dynamic Vapour Sorption and Vapour Equilibrium Methods were used to investigate cement-bentonite (CB) materials unsaturated properties. These measurement methods provide an insight into the potential for self-desiccation of CB materials and their ability to uptake and release of moisture. The current paper shows that the type and mineralogy of bentonite play a role in CB mixture performance criteria (i.e., workability/mechanical properties) and water retention behaviour. It was observed that the presence of a polymer in CB materials impaired the slurry performance criteria and water retention properties. The air entry value (AEV) was high in the CB mixture with a higher percentage of silica, and it slightly increased with time due to a pozzolanic reaction. It is believed that the chemical interaction between cement and bentonite is directly responsible for the formation of the CB internal structure matrix that affects its unsaturated behaviour.

Original languageEnglish
Pages (from-to)119-125
Number of pages7
JournalAustralian Geomechanics Journal
Issue number1
Publication statusPublished - Mar 2022

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