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Effect of a calcium-rich Soil on the performance of an overlying GCL / R. Kerry Rowe in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 4 (Avril 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 423–431 Titre : Effect of a calcium-rich Soil on the performance of an overlying GCL Type de document : texte imprimé Auteurs : R. Kerry Rowe, Auteur ; Khaled Abdelatty, Auteur Année de publication : 2012 Article en page(s) : pp. 423–431 Note générale : Géologie appliquée Langues : Anglais (eng) Mots-clés : Bentonite  Calcium  Cation  exchange  Hydraulic  conductivity  Swell  index  Geosynthetic  clay  liner  Covers Résumé : Changes in geosynthetic clay liner (GCL) properties over time are examined for the case in which the GCL (1) rests directly on a Ca++ rich soil (1,700–1,800  mg/l Ca++) and (2) a 30 cm foundation soil (200–300  mg/l Ca++) overlying the Ca++ rich soil. Results for a control case in which the GCL rested only on the foundation soil are also reported. The moisture content increased to 108% and then remained constant in the control case. The moisture and calcium uptake from the underlying soil caused the moisture content of GCL to increase to 96 and 86% in the first 279 days of the experiment for the cases with and without foundation soil, respectively. The moisture content then decreased to 80 and 67% after 1,100 days under isothermal condition with and without the foundation layer, respectively. After 1,100 days (three years), the hydraulic conductivity of the GCL increased (attributable to cation exchange) from approximately 3×10−11  m/s initially to approximately 7×10−11   and 2×10−10  m/s with and without the foundation layer. Changes in swell index (SI) and exchangeable cations were measured and correlated to changes in hydraulic conductivity. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000614 [article] Effect of a calcium-rich Soil on the performance of an overlying GCL [texte imprimé] / R. Kerry Rowe, Auteur ; Khaled Abdelatty, Auteur . - 2012 . - pp. 423–431. Géologie appliquée Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 4 (Avril 2012) . - pp. 423–431 Mots-clés : Bentonite  Calcium  Cation  exchange  Hydraulic  conductivity  Swell  index  Geosynthetic  clay  liner  Covers Résumé : Changes in geosynthetic clay liner (GCL) properties over time are examined for the case in which the GCL (1) rests directly on a Ca++ rich soil (1,700–1,800  mg/l Ca++) and (2) a 30 cm foundation soil (200–300  mg/l Ca++) overlying the Ca++ rich soil. Results for a control case in which the GCL rested only on the foundation soil are also reported. The moisture content increased to 108% and then remained constant in the control case. The moisture and calcium uptake from the underlying soil caused the moisture content of GCL to increase to 96 and 86% in the first 279 days of the experiment for the cases with and without foundation soil, respectively. The moisture content then decreased to 80 and 67% after 1,100 days under isothermal condition with and without the foundation layer, respectively. After 1,100 days (three years), the hydraulic conductivity of the GCL increased (attributable to cation exchange) from approximately 3×10−11  m/s initially to approximately 7×10−11   and 2×10−10  m/s with and without the foundation layer. Changes in swell index (SI) and exchangeable cations were measured and correlated to changes in hydraulic conductivity. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000614

Leakage and contaminant transport through a single hole in the geomembrane component of a composite liner / R. Kerry Rowe in Journal of geotechnical and geoenvironmental engineering, Vol. 139 N° 3 (Mars 2013) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 357-366 Titre : Leakage and contaminant transport through a single hole in the geomembrane component of a composite liner Type de document : texte imprimé Auteurs : R. Kerry Rowe, Auteur ; Khaled Abdelatty, Auteur Année de publication : 2013 Article en page(s) : pp. 357-366 Note générale : geotechnique Langues : Anglais (eng) Mots-clés : leakage;  composite  materials;  clay  liners;  geosynthetics;  landfills;  geomembranes Résumé : The migration of contaminants through a 10-mm-diameter hole (0.785 cm2) in a geomembrane in direct contact with a geosynthetic clay liner (GCL) and adjacent silty sand is examined. Experiments were conducted in four 0.6-m-diameter cells at a vertical stress of 100 kPa and hydraulic head differences of 0.3 and 1 m. The system was first permeated with distilled water until steady-state flow was attained (the reference case). After 280 days the permeant was changed to a NaCL solution. After 800 days of permeation with 0.14 M NaCl solution there was only a 3% increase in the flow (leakage) compared with the reference case despite up to almost an order of magnitude increase in GCL permeability near the hole. The wetted radius at the end of the experiments was inferred by injection of dye and was found to be about 0.1–0.15 m. This provides the first experimental evidence in support of theoretical predictions that, when the geomembrane is in direct contact with a GCL, leakage through a hole is primarily controlled by the interface transmissivity rather than the GCL hydraulic conductivity when there is interaction between the permeant and the GCL. The observed chloride distribution in the silty sand at the end of the experiments is reported. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000773 [article] Leakage and contaminant transport through a single hole in the geomembrane component of a composite liner [texte imprimé] / R. Kerry Rowe, Auteur ; Khaled Abdelatty, Auteur . - 2013 . - pp. 357-366. geotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 139 N° 3 (Mars 2013) . - pp. 357-366 Mots-clés : leakage;  composite  materials;  clay  liners;  geosynthetics;  landfills;  geomembranes Résumé : The migration of contaminants through a 10-mm-diameter hole (0.785 cm2) in a geomembrane in direct contact with a geosynthetic clay liner (GCL) and adjacent silty sand is examined. Experiments were conducted in four 0.6-m-diameter cells at a vertical stress of 100 kPa and hydraulic head differences of 0.3 and 1 m. The system was first permeated with distilled water until steady-state flow was attained (the reference case). After 280 days the permeant was changed to a NaCL solution. After 800 days of permeation with 0.14 M NaCl solution there was only a 3% increase in the flow (leakage) compared with the reference case despite up to almost an order of magnitude increase in GCL permeability near the hole. The wetted radius at the end of the experiments was inferred by injection of dye and was found to be about 0.1–0.15 m. This provides the first experimental evidence in support of theoretical predictions that, when the geomembrane is in direct contact with a GCL, leakage through a hole is primarily controlled by the interface transmissivity rather than the GCL hydraulic conductivity when there is interaction between the permeant and the GCL. The observed chloride distribution in the silty sand at the end of the experiments is reported. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000773