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Hydraulic conductivity of bentonite slurry mixed sands / David Castelbaum in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 12 (Décembre 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 12 (Décembre 2009) . - pp. 1941–1956 Titre : Hydraulic conductivity of bentonite slurry mixed sands Type de document : texte imprimé Auteurs : David Castelbaum, Auteur ; Charles D. Shackelford, Auteur Année de publication : 2010 Article en page(s) : pp. 1941–1956 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : BentoniteHydraulic  conductivitySandSoil  typeSlurriesSoil  mixing Résumé : The hydraulic conductivity (k) of specimens from columns containing initially dry sands mixed with bentonite slurries was measured. The mixed specimens represented a range in void ratios (0.672≤e≤3.94) and bentonite contents ( 0.61%≤BC≤7.65% , by dry weight). The measured k values, which ranged from 2.4×10−7 cm/s to 6.8×10−4 cm/s , correlated poorly with the total void ratio (e) of the specimens, due to the complicating effect of the bentonite in the sand-bentonite slurry mixtures. However, the measured k values correlated better with the void ratio of the bentonite (eb) , which is consistent with the results of previous studies involving permeation of compacted bentonite and sand-bentonite specimens, even though the range in values of eb in this study (42.5≤eb≤127) was much higher than that previously reported. The relatively large range in eb values for the sand-bentonite slurry mixtures was also consistent with the relatively large range in measured k values, which are about one to seven orders of magnitude higher than values of k commonly reported for compacted sand-bentonite mixtures, despite similar bentonite contents. In terms of bentonite content, addition of more than 3% bentonite via slurry injection and mixing with the sands was successful in reducing the k of the unmixed sands (9.4×10−3 cm/s≤k≤5.4×10−2 cm/s) by as much as four orders of magnitude to values less than 1.0×10−6 cm/s . En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000169 [article] Hydraulic conductivity of bentonite slurry mixed sands [texte imprimé] / David Castelbaum, Auteur ; Charles D. Shackelford, Auteur . - 2010 . - pp. 1941–1956. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 12 (Décembre 2009) . - pp. 1941–1956 Mots-clés : BentoniteHydraulic  conductivitySandSoil  typeSlurriesSoil  mixing Résumé : The hydraulic conductivity (k) of specimens from columns containing initially dry sands mixed with bentonite slurries was measured. The mixed specimens represented a range in void ratios (0.672≤e≤3.94) and bentonite contents ( 0.61%≤BC≤7.65% , by dry weight). The measured k values, which ranged from 2.4×10−7 cm/s to 6.8×10−4 cm/s , correlated poorly with the total void ratio (e) of the specimens, due to the complicating effect of the bentonite in the sand-bentonite slurry mixtures. However, the measured k values correlated better with the void ratio of the bentonite (eb) , which is consistent with the results of previous studies involving permeation of compacted bentonite and sand-bentonite specimens, even though the range in values of eb in this study (42.5≤eb≤127) was much higher than that previously reported. The relatively large range in eb values for the sand-bentonite slurry mixtures was also consistent with the relatively large range in measured k values, which are about one to seven orders of magnitude higher than values of k commonly reported for compacted sand-bentonite mixtures, despite similar bentonite contents. In terms of bentonite content, addition of more than 3% bentonite via slurry injection and mixing with the sands was successful in reducing the k of the unmixed sands (9.4×10−3 cm/s≤k≤5.4×10−2 cm/s) by as much as four orders of magnitude to values less than 1.0×10−6 cm/s . En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000169