Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hydraulic Conductivity of Sand-Bentonite Backfills Containing HYPER Clay
The hydraulic conductivity, k, of model sand-bentonite backfills containing HYPER clay (Na bentonite treated with carboxymethyl cellulose [CMC]) was investigated in this study. Flexible-wall tests were performed on backfill specimens composed of clean, fine sand and 2.7-5.6% HYPER clay containing either 2% CMC (HC2) or 8% CMC (HC8). The geometric mean k to water (kw) for HC8 specimens decreased by nearly two orders of magnitude (from ~3x10-9 m/s to ~3x10-11 m/s) with increasing HC8 content from 2.7 to 5.6%. The geometric mean kw of 3x10-11 m/s for the 5.6% HC8 backfill was nearly an order of magnitude lower than kw reported previously for similar backfill specimens containing 5.7% Na bentonite (Naturalgel® [NG]) or 5.6% multiswellable bentonite (MSB) due to the greater water absorption and swell capacity of HC8 relative to the NG and MSB. The 5.6% HC2 specimens exhibited slightly lower kw relative to specimens containing 5.7% NG or 5.6% MSB. Also, whereas the NG and MSB specimens exhibited increases in k when the permeant liquid was changed to a 10-mM CaCl2 solution, no increases were observed for 5.6% HC2. Although further testing is needed, the results illustrate the potential for HYPER clay to enhance the hydraulic performance of soil-bentonite vertical barriers.
Hydraulic Conductivity of Sand-Bentonite Backfills Containing HYPER Clay
The hydraulic conductivity, k, of model sand-bentonite backfills containing HYPER clay (Na bentonite treated with carboxymethyl cellulose [CMC]) was investigated in this study. Flexible-wall tests were performed on backfill specimens composed of clean, fine sand and 2.7-5.6% HYPER clay containing either 2% CMC (HC2) or 8% CMC (HC8). The geometric mean k to water (kw) for HC8 specimens decreased by nearly two orders of magnitude (from ~3x10-9 m/s to ~3x10-11 m/s) with increasing HC8 content from 2.7 to 5.6%. The geometric mean kw of 3x10-11 m/s for the 5.6% HC8 backfill was nearly an order of magnitude lower than kw reported previously for similar backfill specimens containing 5.7% Na bentonite (Naturalgel® [NG]) or 5.6% multiswellable bentonite (MSB) due to the greater water absorption and swell capacity of HC8 relative to the NG and MSB. The 5.6% HC2 specimens exhibited slightly lower kw relative to specimens containing 5.7% NG or 5.6% MSB. Also, whereas the NG and MSB specimens exhibited increases in k when the permeant liquid was changed to a 10-mM CaCl2 solution, no increases were observed for 5.6% HC2. Although further testing is needed, the results illustrate the potential for HYPER clay to enhance the hydraulic performance of soil-bentonite vertical barriers.
Hydraulic Conductivity of Sand-Bentonite Backfills Containing HYPER Clay
Malusis, Michael A. (Autor:in) / Di Emidio, Gemmina (Autor:in)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 1870-1879
24.02.2014
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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