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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)

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

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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