Documents disponibles écrits par cet auteur

Aging of HDPE Geomembrane in Three Composite Landfill Liner Configurations / R. Kerry Rowe in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°7 (Juillet 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°7 (Juillet 2008) . - pp. 906–916 Titre : Aging of HDPE Geomembrane in Three Composite Landfill Liner Configurations Type de document : texte imprimé Auteurs : R. Kerry Rowe, Auteur ; S. Rimal, Auteur Année de publication : 2008 Article en page(s) : pp. 906–916 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Durability  Geomembranes  Landfills  Liners  Service  life  Temperature Résumé : Laboratory-accelerated aging experiments conducted to examine the depletion of antioxidant from a geomembrane (GM) underlain by a geosynthetic clay liner (GCL) are described. Three different “protection” layers between the GM and overlying gravel and leachate are examined: (1) A traditional nonwoven geotextile (GT); (2) a GT-GCL; and (3) a GT-sand-GT layer. The GT-GCL protection layer gives an antioxidant depletion rate 0.59 to 0.66 times slower than the GT layer alone. The GT-sand-GT layer gives depletion rates 0.72–0.75 times that of the conventional GT alone. Based on Arrhenius modeling, the time required for depletion of antioxidants at 35°C is estimated to be 65 years for a GM with a GT-GCL protection layer, 50 years for a GT-sand-GT layer, and 40 years for a conventional GT protection layer. These times are all significantly greater than the depletion time for GM immersed in leachate (10 years) for the geomembrane tested. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A7%2890 [...] [article] Aging of HDPE Geomembrane in Three Composite Landfill Liner Configurations [texte imprimé] / R. Kerry Rowe, Auteur ; S. Rimal, Auteur . - 2008 . - pp. 906–916. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°7 (Juillet 2008) . - pp. 906–916 Mots-clés : Durability  Geomembranes  Landfills  Liners  Service  life  Temperature Résumé : Laboratory-accelerated aging experiments conducted to examine the depletion of antioxidant from a geomembrane (GM) underlain by a geosynthetic clay liner (GCL) are described. Three different “protection” layers between the GM and overlying gravel and leachate are examined: (1) A traditional nonwoven geotextile (GT); (2) a GT-GCL; and (3) a GT-sand-GT layer. The GT-GCL protection layer gives an antioxidant depletion rate 0.59 to 0.66 times slower than the GT layer alone. The GT-sand-GT layer gives depletion rates 0.72–0.75 times that of the conventional GT alone. Based on Arrhenius modeling, the time required for depletion of antioxidants at 35°C is estimated to be 65 years for a GM with a GT-GCL protection layer, 50 years for a GT-sand-GT layer, and 40 years for a conventional GT protection layer. These times are all significantly greater than the depletion time for GM immersed in leachate (10 years) for the geomembrane tested. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A7%2890 [...]

Antioxidant depletion from a high density polyethylene geomembrane under simulated landfill conditions / R. Kerry Rowe in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 7 (Juillet 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 930-939 Titre : Antioxidant depletion from a high density polyethylene geomembrane under simulated landfill conditions Type de document : texte imprimé Auteurs : R. Kerry Rowe, Auteur ; M. Z. Islam, Auteur ; R. W. I. Brachman, Auteur Année de publication : 2010 Article en page(s) : pp. 930-939 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Durability  Geomembranes  Landfills  Liners  Service  life  Temperature  HDPE  Municipal  solid  waste Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Accelerated aging tests to evaluate the depletion of antioxidants from a high density polyethylene geomembrane are described. The effects of temperature, high pressure, and continuous leachate circulation on the aging of geomembranes in composite liner systems are examined. The antioxidant depletion rates (0.05, 0.19, and 0.41 month−1 at 55, 70, and 85°C, respectively) obtained for the simulated landfill liner at 250 kPa vertical pressure are consistently lower than that obtained from traditional leachate immersion tests on the same geomembrane (0.12, 0.39, and 1.1 month−1 at 55, 70, and 85°C). This difference leads to a substantial increase in antioxidant depletion times at a typical landfill liner temperature (35°C) with 40 years predicted based on the data from the landfill liner simulators tests, compared to 15 years predicted for the same geomembrane based on leachate immersion tests. In these tests, the crystallinity and tensile yield strain of the geomembrane increased in the early stages of aging and then remained relatively constant over the testing period. There was no significant change in other geomembrane properties within the testing period. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i7/p930_s1?isAuthorized=no [article] Antioxidant depletion from a high density polyethylene geomembrane under simulated landfill conditions [texte imprimé] / R. Kerry Rowe, Auteur ; M. Z. Islam, Auteur ; R. W. I. Brachman, Auteur . - 2010 . - pp. 930-939. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 7 (Juillet 2010) . - pp. 930-939 Mots-clés : Durability  Geomembranes  Landfills  Liners  Service  life  Temperature  HDPE  Municipal  solid  waste Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Accelerated aging tests to evaluate the depletion of antioxidants from a high density polyethylene geomembrane are described. The effects of temperature, high pressure, and continuous leachate circulation on the aging of geomembranes in composite liner systems are examined. The antioxidant depletion rates (0.05, 0.19, and 0.41 month−1 at 55, 70, and 85°C, respectively) obtained for the simulated landfill liner at 250 kPa vertical pressure are consistently lower than that obtained from traditional leachate immersion tests on the same geomembrane (0.12, 0.39, and 1.1 month−1 at 55, 70, and 85°C). This difference leads to a substantial increase in antioxidant depletion times at a typical landfill liner temperature (35°C) with 40 years predicted based on the data from the landfill liner simulators tests, compared to 15 years predicted for the same geomembrane based on leachate immersion tests. In these tests, the crystallinity and tensile yield strain of the geomembrane increased in the early stages of aging and then remained relatively constant over the testing period. There was no significant change in other geomembrane properties within the testing period. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i7/p930_s1?isAuthorized=no

Depletion of antioxidants from a HDPE geomembrane in a composite liner / R. Kerry Rowe in Journal of geotechnical and geoenvironmental engineering, Vol. 134 N°1 (Janvier 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 68–78 Titre : Depletion of antioxidants from a HDPE geomembrane in a composite liner Type de document : texte imprimé Auteurs : R. Kerry Rowe, Auteur ; S. Rimal, Auteur Année de publication : 2008 Article en page(s) : pp. 68–78 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Geomembranes  Durability  Liners  Landfills  Service  life  Temperature  Composite  materials Résumé : The results of two series of accelerated aging tests are reported. Both series of tests were conducted at temperatures of 85, 70, 55, and 26°C over a period of about 3years . In the simulated liner series, the top of the geomembrane was covered with a geotextile (protection) layer that was exposed to simulated municipal solid waste (MSW) landfill leachate while the bottom of the geomembrane was in contact with a hydrated geosynthetic clay liner. In the immersion series, the geomembrane was immersed in the simulated MSW leachate, and hence, both sides were exposed to leachate. The results from oxidative induction time tests indicate that the antioxidant depletion is about 2.2–4.8 times faster for the leachate immersed geomembrane than for geomembrane in a composite liner. The higher rates are attributed to the higher extraction of antioxidants from two sides of the geomembrane immersed in leachate. The measured antioxidant depletion rates are extrapolated to a range of temperatures (0–60°C) using Arrhenius modeling. At a liner temperature of 35°C , the calculated time for the depletion of antioxidants is about 40years for a geomembrane in a composite liner compared to 10years if it is simply immersed in leachate. These tests suggest that to obtain realistic estimates of geomembrane service life one needs data from tests that simulate the expected field conditions and that prediction based on immersion tests may underestimate the service life. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2868 [...] [article] Depletion of antioxidants from a HDPE geomembrane in a composite liner [texte imprimé] / R. Kerry Rowe, Auteur ; S. Rimal, Auteur . - 2008 . - pp. 68–78. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 N°1 (Janvier 2008) . - pp. 68–78 Mots-clés : Geomembranes  Durability  Liners  Landfills  Service  life  Temperature  Composite  materials Résumé : The results of two series of accelerated aging tests are reported. Both series of tests were conducted at temperatures of 85, 70, 55, and 26°C over a period of about 3years . In the simulated liner series, the top of the geomembrane was covered with a geotextile (protection) layer that was exposed to simulated municipal solid waste (MSW) landfill leachate while the bottom of the geomembrane was in contact with a hydrated geosynthetic clay liner. In the immersion series, the geomembrane was immersed in the simulated MSW leachate, and hence, both sides were exposed to leachate. The results from oxidative induction time tests indicate that the antioxidant depletion is about 2.2–4.8 times faster for the leachate immersed geomembrane than for geomembrane in a composite liner. The higher rates are attributed to the higher extraction of antioxidants from two sides of the geomembrane immersed in leachate. The measured antioxidant depletion rates are extrapolated to a range of temperatures (0–60°C) using Arrhenius modeling. At a liner temperature of 35°C , the calculated time for the depletion of antioxidants is about 40years for a geomembrane in a composite liner compared to 10years if it is simply immersed in leachate. These tests suggest that to obtain realistic estimates of geomembrane service life one needs data from tests that simulate the expected field conditions and that prediction based on immersion tests may underestimate the service life. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A1%2868 [...]

Diffusive transport of VOCs through LLDPE and two coextruded geomembranes / Rebecca S. McWatters in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 9 (Septembre 2010) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1167-1177 Titre : Diffusive transport of VOCs through LLDPE and two coextruded geomembranes Type de document : texte imprimé Auteurs : Rebecca S. McWatters, Auteur ; R. Kerry Rowe, Auteur Année de publication : 2010 Article en page(s) : pp. 1167-1177 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Geomembranes  Diffusion  Permeability  Volatile  organic  chemicals  Barrier Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The diffusive properties of two coextruded geomembranes, one with a polyamide inner core and the other with an ethylene vinyl-alcohol (EVOH) inner core, and a standard 0.53-mm (20-mil) linear low-density polyethylene (LLDPE) geomembrane were examined. Diffusion and sorption laboratory tests were performed to estimate the parameters controlling diffusive migration, including the partitioning, diffusion, and permeation coefficients of the geomembrane in both the aqueous and vapor phases. Results indicate a significant reduction in mass flux through the coextruded geomembranes compared to conventional LLDPE. The EVOH coextruded geomembrane had the lowest permeation coefficients (Pg) with a range of (2–6)×10−12 m2 s−1 for diffusion from the aqueous phase. These values for EVOH are upper bounds and the actual values may be lower than as stated. The polyamide (nylon) coextruded geomembrane had higher values than for EVOH, with a Pg range of (0.7–2.2)×10−11 m2 s−1 from the aqueous phase. The highest permeation coefficients were for the standard 20-mil LLDPE, which ranged from (0.6–1.1)×10−10 m2 s−1. Thus the permeation coefficient for LLDPE was about one order of magnitude greater than for the nylon coextruded and at least two orders of magnitudes higher than for the EVOH coextruded geomembrane. Both coextruded geomembranes showed decreased Pg values and therefore improved diffusive resistance to volatile organic compounds over traditional 0.56-mm PVC geomembranes. The EVOH geomembrane showed a 5–12-fold decrease in Pg in comparison to a 2.0-mm high density polyethylene geomembrane. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i9/p1167_s1?isAuthorized=no [article] Diffusive transport of VOCs through LLDPE and two coextruded geomembranes [texte imprimé] / Rebecca S. McWatters, Auteur ; R. Kerry Rowe, Auteur . - 2010 . - pp. 1167-1177. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 9 (Septembre 2010) . - pp. 1167-1177 Mots-clés : Geomembranes  Diffusion  Permeability  Volatile  organic  chemicals  Barrier Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : The diffusive properties of two coextruded geomembranes, one with a polyamide inner core and the other with an ethylene vinyl-alcohol (EVOH) inner core, and a standard 0.53-mm (20-mil) linear low-density polyethylene (LLDPE) geomembrane were examined. Diffusion and sorption laboratory tests were performed to estimate the parameters controlling diffusive migration, including the partitioning, diffusion, and permeation coefficients of the geomembrane in both the aqueous and vapor phases. Results indicate a significant reduction in mass flux through the coextruded geomembranes compared to conventional LLDPE. The EVOH coextruded geomembrane had the lowest permeation coefficients (Pg) with a range of (2–6)×10−12 m2 s−1 for diffusion from the aqueous phase. These values for EVOH are upper bounds and the actual values may be lower than as stated. The polyamide (nylon) coextruded geomembrane had higher values than for EVOH, with a Pg range of (0.7–2.2)×10−11 m2 s−1 from the aqueous phase. The highest permeation coefficients were for the standard 20-mil LLDPE, which ranged from (0.6–1.1)×10−10 m2 s−1. Thus the permeation coefficient for LLDPE was about one order of magnitude greater than for the nylon coextruded and at least two orders of magnitudes higher than for the EVOH coextruded geomembrane. Both coextruded geomembranes showed decreased Pg values and therefore improved diffusive resistance to volatile organic compounds over traditional 0.56-mm PVC geomembranes. The EVOH geomembrane showed a 5–12-fold decrease in Pg in comparison to a 2.0-mm high density polyethylene geomembrane. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i9/p1167_s1?isAuthorized=no

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

Effect of GCL properties on shrinkage when subjected to wet-dry cycles / R. Kerry Rowe in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 11 (Novembre 2011) 

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Effects of thickness on the aging of HDPE geomembranes / R. Kerry Rowe in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 2 (Fevrier 2010) 

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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) 

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Thickness and hydraulic performance of geosynthetic clay liners overlying a geonet / S. Dickinson in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 4 (Avril 2010) 

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Water-retention behavior of geosynthetic clay liners / Ryley A. Beddoe in Journal of geotechnical and geoenvironmental engineering, Vol. 137 N° 11 (Novembre 2011) 

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