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Chemical compatibility of model soil-bentonite backfill containing multiswellable bentonite / Michael A. Malusis in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 2 (Février 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 189-198 Titre : Chemical compatibility of model soil-bentonite backfill containing multiswellable bentonite Type de document : texte imprimé Auteurs : Michael A. Malusis, Auteur ; Matthew D. McKeehan, Auteur Année de publication : 2013 Article en page(s) : pp. 189-198 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : backfill;  bentonite;  chemical  compatibility;  cutoff  wall;  hydraulic  conductivity;  vertical  barrier Résumé : The objective of this study was to evaluate the chemical compatibility of model soil-bentonite backfills containing multiswellable bentonite (MSB) relative to that of similar backfills containing untreated sodium (Na) bentonite or a commercially available, contaminant-resistant bentonite (SW101). Flexible-wall tests were conducted on consolidated backfill specimens (effective stress=34.5 kPa) containing clean sand and 4.5–5.7% bentonite (by dry weight) using tap water and calcium chloride (CaCl2) solutions (10–1,000 mM) as the permeant liquids. Final values of hydraulic conductivity (k) and intrinsic permeability (K) to the CaCl2 solutions were determined after achieving both short-term termination criteria as defined by ASTM D5084 and long-term termination criteria for chemical equilibrium between the influent and effluent. Specimens containing MSB exhibited the smallest increases in k and K upon permeation with a given CaCl2 solution relative to specimens containing untreated Na bentonite or SW101. However, none of the specimens exhibited more than a fivefold increase in k or K, regardless of CaCl2 concentration or bentonite type. Final k values for specimens permeated with a given CaCl2 solution after permeation with tap water were similar to those for specimens of the same backfill permeated with only the CaCl2 solution, indicating that the order of permeation had no significant effect on k. Also, final k values for all specimens were within a factor of two of the k measured after achieving the ASTM D5084 termination criteria. Thus, use of only the ASTM D5084 criteria would have been sufficient to obtain reasonable estimates of long-term hydraulic conductivity for the specimens in this study. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000729 [article] Chemical compatibility of model soil-bentonite backfill containing multiswellable bentonite [texte imprimé] / Michael A. Malusis, Auteur ; Matthew D. McKeehan, Auteur . - 2013 . - pp. 189-198. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 2 (Février 2013) . - pp. 189-198 Mots-clés : backfill;  bentonite;  chemical  compatibility;  cutoff  wall;  hydraulic  conductivity;  vertical  barrier Résumé : The objective of this study was to evaluate the chemical compatibility of model soil-bentonite backfills containing multiswellable bentonite (MSB) relative to that of similar backfills containing untreated sodium (Na) bentonite or a commercially available, contaminant-resistant bentonite (SW101). Flexible-wall tests were conducted on consolidated backfill specimens (effective stress=34.5 kPa) containing clean sand and 4.5–5.7% bentonite (by dry weight) using tap water and calcium chloride (CaCl2) solutions (10–1,000 mM) as the permeant liquids. Final values of hydraulic conductivity (k) and intrinsic permeability (K) to the CaCl2 solutions were determined after achieving both short-term termination criteria as defined by ASTM D5084 and long-term termination criteria for chemical equilibrium between the influent and effluent. Specimens containing MSB exhibited the smallest increases in k and K upon permeation with a given CaCl2 solution relative to specimens containing untreated Na bentonite or SW101. However, none of the specimens exhibited more than a fivefold increase in k or K, regardless of CaCl2 concentration or bentonite type. Final k values for specimens permeated with a given CaCl2 solution after permeation with tap water were similar to those for specimens of the same backfill permeated with only the CaCl2 solution, indicating that the order of permeation had no significant effect on k. Also, final k values for all specimens were within a factor of two of the k measured after achieving the ASTM D5084 termination criteria. Thus, use of only the ASTM D5084 criteria would have been sufficient to obtain reasonable estimates of long-term hydraulic conductivity for the specimens in this study. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000729

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]  in Journal 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

Hydraulic conductivity and compressibility of soil-bentonite backfill amended with activated carbon / Michael A. Malusis in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 5 (Mai 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 5 (Mai 2009) . - pp. 664–672 Titre : Hydraulic conductivity and compressibility of soil-bentonite backfill amended with activated carbon Type de document : texte imprimé Auteurs : Michael A. Malusis, Auteur ; Edward J. Barben, Auteur ; Jeffrey C. Evans, Auteur Année de publication : 2009 Article en page(s) : pp. 664–672 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Activated  carbon  Bentonite  Compression  Cutoff  walls  Hydraulic  conductivity Résumé : Flexible-wall permeability tests and rigid-wall consolidation/permeability tests were performed to evaluate the hydraulic conductivity and compressibility of a model soil-bentonite (SB) backfill amended with granular activated carbon (GAC) or powdered activated carbon (PAC). The tests were performed as part of an assessment of enhanced SB backfill with improved attenuation capacity for greater longevity of barrier containment performance. Backfill specimens containing fine sand, 5.8% sodium bentonite, and GAC or PAC (0, 2, 5, and 10% by dry weight) were prepared to target slumps of 125±12.5mm . Hydraulic conductivity (k) and compressibility of backfill test specimens were measured in consolidometers as a function of effective stress, σ′ (24⩽σ′⩽1,532kPa) , whereas flexible-wall k was measured for backfill specimens consolidated to σ′=34.5kPa . The results indicate that addition of GAC has little impact on the hydraulic and consolidation properties of the backfill, whereas addition of PAC causes a decrease in k and consolidation coefficient (cv) and a slight increase in compression index (Cc) . Differences in behavior between GAC-amended backfills and PAC-amended backfills are attributed primarily to differences in GAC and PAC particle size. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000041 [article] Hydraulic conductivity and compressibility of soil-bentonite backfill amended with activated carbon [texte imprimé] / Michael A. Malusis, Auteur ; Edward J. Barben, Auteur ; Jeffrey C. Evans, Auteur . - 2009 . - pp. 664–672. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 5 (Mai 2009) . - pp. 664–672 Mots-clés : Activated  carbon  Bentonite  Compression  Cutoff  walls  Hydraulic  conductivity Résumé : Flexible-wall permeability tests and rigid-wall consolidation/permeability tests were performed to evaluate the hydraulic conductivity and compressibility of a model soil-bentonite (SB) backfill amended with granular activated carbon (GAC) or powdered activated carbon (PAC). The tests were performed as part of an assessment of enhanced SB backfill with improved attenuation capacity for greater longevity of barrier containment performance. Backfill specimens containing fine sand, 5.8% sodium bentonite, and GAC or PAC (0, 2, 5, and 10% by dry weight) were prepared to target slumps of 125±12.5mm . Hydraulic conductivity (k) and compressibility of backfill test specimens were measured in consolidometers as a function of effective stress, σ′ (24⩽σ′⩽1,532kPa) , whereas flexible-wall k was measured for backfill specimens consolidated to σ′=34.5kPa . The results indicate that addition of GAC has little impact on the hydraulic and consolidation properties of the backfill, whereas addition of PAC causes a decrease in k and consolidation coefficient (cv) and a slight increase in compression index (Cc) . Differences in behavior between GAC-amended backfills and PAC-amended backfills are attributed primarily to differences in GAC and PAC particle size. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000041