Consolidation and hydraulic conductivity of zeolite-amended soil-bentonite backfills / Catherine S. Hong in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 1 (Janvier 2012)  

Public ISBD [article]  inJournal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 15-25 Titre : Consolidation and hydraulic conductivity of zeolite-amended soil-bentonite backfills Type de document : texte imprimé Auteurs : Catherine S. Hong, Auteur ; Charles D. Shackelford, Auteur ; Michael A. Malusis, Auteur Année de publication : 2012 Article en page(s) : pp. 15-25 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Bentonite Consolidation Cutoff wall Hydraulic conductivity Soil-bentonite backfill Zeolite Résumé : The effect of zeolite amendment for enhanced sorption capacity on the consolidation behavior and hydraulic conductivity, k, of a representative soil-bentonite (SB) backfill for vertical cutoff walls was evaluated via laboratory testing. The consolidation behavior and k of test specimens containing fine sand, 5.8% (dry weight) sodium bentonite, and 0, 2, 5, or 10% (dry weight) of one of three types of zeolite (clinoptilolite, chabazite-lower bed, or chabazite-upper bed) were measured using fixed-ring oedometers, and k also was measured on separate specimens using a flexible-wall permeameter. The results indicated that addition of a zeolite had little impact on either the consolidation behavior or the k of the backfill, regardless of the amount or type of zeolite. For example, the compression index, Cc, for the unamended backfill specimen was 0.24, whereas values of Cc for the zeolite-amended specimens were in the range 0.19 ≤ Cc ≤ 0.23. Similarly, the k for the unamended specimen based on flexible-wall tests was 2.4×10-10  m/s, whereas values of k for zeolite-amended specimens were in the range 1.2×10-10 ≤ k ≤ 3.9×10-10  m/s. The results of the study suggest that enhancing the sorption capacity of typical SB backfills via zeolite amendment is not likely to have a significant effect on the consolidation behavior or k of the backfill, provided that the amount of zeolite added is small ( ≤ 10%). DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p15_s1?isAuthorized=no [article] Consolidation and hydraulic conductivity of zeolite-amended soil-bentonite backfills [texte imprimé] / Catherine S. Hong, Auteur ; Charles D. Shackelford, Auteur ; Michael A. Malusis, Auteur . - 2012 . - pp. 15-25. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 1 (Janvier 2012) . - pp. 15-25 Mots-clés : Bentonite Consolidation Cutoff wall Hydraulic conductivity Soil-bentonite backfill Zeolite Résumé : The effect of zeolite amendment for enhanced sorption capacity on the consolidation behavior and hydraulic conductivity, k, of a representative soil-bentonite (SB) backfill for vertical cutoff walls was evaluated via laboratory testing. The consolidation behavior and k of test specimens containing fine sand, 5.8% (dry weight) sodium bentonite, and 0, 2, 5, or 10% (dry weight) of one of three types of zeolite (clinoptilolite, chabazite-lower bed, or chabazite-upper bed) were measured using fixed-ring oedometers, and k also was measured on separate specimens using a flexible-wall permeameter. The results indicated that addition of a zeolite had little impact on either the consolidation behavior or the k of the backfill, regardless of the amount or type of zeolite. For example, the compression index, Cc, for the unamended backfill specimen was 0.24, whereas values of Cc for the zeolite-amended specimens were in the range 0.19 ≤ Cc ≤ 0.23. Similarly, the k for the unamended specimen based on flexible-wall tests was 2.4×10-10  m/s, whereas values of k for zeolite-amended specimens were in the range 1.2×10-10 ≤ k ≤ 3.9×10-10  m/s. The results of the study suggest that enhancing the sorption capacity of typical SB backfills via zeolite amendment is not likely to have a significant effect on the consolidation behavior or k of the backfill, provided that the amount of zeolite added is small ( ≤ 10%). DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i1/p15_s1?isAuthorized=no

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