Study on the Hydraulic Conductivity of Sand-Bentonite mixtures used as Liner System of Waste Landfill

Si Fa Xu; Zhe Wang; Yong Zhang

doi:10.4028/www.scientific.net/AMR.194-196.909

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 194-196Study on the Hydraulic Conductivity of...

Study on the Hydraulic Conductivity of Sand-Bentonite mixtures used as Liner System of Waste Landfill

Abstract:

A liner system such as liner sheet underlying impermeable soil layer having hydraulic conductivity less than 1*10^-7 cm/s and a thickness larger than 100 cm is often used in china. As there is very little natural clay having such low permeability, bentonite is usually mixed into sand to decrease the permeability. In this paper, the compaction tests and permeability testing using flexible-wall permeameter are conducted. The test results show that the value of critical benonite ratio depends on bentonite ratio, and the hydraulic conductivity of the sand mixed with critical bentonite ratio for distilled water shows of the order of 1*10^-8 cm/s that satisfies the china standard requested as compacted soil liner of waste landfill. Finally, the permeability testing used leachate including calcium component was conducted.

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Periodical:

Advanced Materials Research (Volumes 194-196)

Pages:

909-912

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.194-196.909

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Online since:

February 2011

Authors:

Si Fa Xu, Zhe Wang, Yong Zhang

Keywords:

Bentonite Ratio, Hydraulic Conductivity, Liner System, Sand-Bentonite Mixture

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