CUED Publications database

Long-term performance of cement-bentonite containment wall

Joshi, K and Soga, K and Tedd, P (2009) Long-term performance of cement-bentonite containment wall. In: UNSPECIFIED pp. 2028-2031..

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Abstract

The paper presents hydraulic conductivity, unconfined compression strength (UCS) and triaxial test results of an 11 year old slag-cement-bentonite (CB) cut-off wall material and identifies factors affecting their long-term performance. The laboratory tests were performed on three types of CB samples ranging from contaminated block field samples to uncontaminated laboratory cast samples. The results showed that hydraulic conductivity reduces till 3 years and UCS increases till 90 days, but there after it remains constant till 11 years of age. The mean hydraulic conductivity and UCS values of block field samples are inferior and have large variability than laboratory cured samples. Such variations are mainly because of heterogeneity caused by aggressive environment and impurities within the specimen. Consolidated undrained triaxial test found that under an effective confining pressure of less than 200 kPa, tension failure occurred since the minor principal stress dropped to zero value at failure. The research outcome is useful for understanding future liability of CB wall and improving their design. © 2009 IOS Press.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Uncontrolled Keywords: Cement-bentonite Cut-off wall Hydraulic conductivity Triaxial test UCS
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:31
Last Modified: 08 Dec 2014 02:38
DOI: 10.3233/978-1-60750-031-5-2028