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Laboratory and in situ tests for long-term hydraulic conductivity of a cement-bentonite cutoff wall / Kaushal Joshi in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 4 (Avril 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 562-572 Titre : Laboratory and in situ tests for long-term hydraulic conductivity of a cement-bentonite cutoff wall Type de document : texte imprimé Auteurs : Kaushal Joshi, Auteur ; Cedric Kechavarzi, Auteur ; Kenneth Sutherland, Auteur Année de publication : 2010 Article en page(s) : pp. 562-572 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Bentonite  Cements  Containment  Groundwater  pollution  Heterogeneity  Hydraulic  conductivity  In  situ  tests  Slurry  walls Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Slurry trench cutoff walls, constructed using self-hardening slag-cement-bentonite (Slag-CB), are the most common form of in-ground vertical contaminant barrier in the U.K., Europe, and Japan, and are increasingly being used in the United States. This paper presents a case study of the hydraulic conductivity evaluation of an 11-year-old Slag-CB wall material at a sulfate-contaminated site, using different in situ techniques and laboratory tests. The laboratory results suggest that the hydraulic conductivity of the samples, which vary in age from 4 weeks to 11 years, decreases with time for the first 3 years but then remains constant. The results indicate that the long-term performance of these containment walls is influenced by various parameters such as aging, the type/duration of contaminant exposure, mixing of surrounding soil during construction, and wall depth. Piezocone tests, packer tests, and self-boring permeameter tests were carried out in the field to determine the suitability of different in situ techniques and compare with the laboratory results. The hydraulic conductivity is affected by the type of in situ technique used and the geometric scale of the test section. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i4/p562_s1?isAuthorized=no [article] Laboratory and in situ tests for long-term hydraulic conductivity of a cement-bentonite cutoff wall [texte imprimé] / Kaushal Joshi, Auteur ; Cedric Kechavarzi, Auteur ; Kenneth Sutherland, Auteur . - 2010 . - pp. 562-572. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 4 (Avril 2010) . - pp. 562-572 Mots-clés : Bentonite  Cements  Containment  Groundwater  pollution  Heterogeneity  Hydraulic  conductivity  In  situ  tests  Slurry  walls Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Slurry trench cutoff walls, constructed using self-hardening slag-cement-bentonite (Slag-CB), are the most common form of in-ground vertical contaminant barrier in the U.K., Europe, and Japan, and are increasingly being used in the United States. This paper presents a case study of the hydraulic conductivity evaluation of an 11-year-old Slag-CB wall material at a sulfate-contaminated site, using different in situ techniques and laboratory tests. The laboratory results suggest that the hydraulic conductivity of the samples, which vary in age from 4 weeks to 11 years, decreases with time for the first 3 years but then remains constant. The results indicate that the long-term performance of these containment walls is influenced by various parameters such as aging, the type/duration of contaminant exposure, mixing of surrounding soil during construction, and wall depth. Piezocone tests, packer tests, and self-boring permeameter tests were carried out in the field to determine the suitability of different in situ techniques and compare with the laboratory results. The hydraulic conductivity is affected by the type of in situ technique used and the geometric scale of the test section. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i4/p562_s1?isAuthorized=no