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Service Life of a High-Density Polyethylene Geomembrane under Simulated Landfill Conditions at 85°C
The time to rupture of a 1.5-mm-thick high-density polyethylene geomembrane aged in a typical landfill composite liner configuration is investigated under a pressure of 250 kPa at 85°C. The geomembrane was underlain with a geosynthetic clay liner and had a needle-pinched nonwoven geotextile protection layer separating it from 50 mm of drainage gravel containing leachate. Seventeen (0.6-m-diameter) tests were conducted. In addition to 9 months required to deplete antioxidants (Stage I), the tests indicated a lag period (Stage II) of 5.5 months and a time from the start of degradation to rupture (Stage III) of 20 months, giving a total inferred time to rupture of 34.5 months (2.9 years). There were up to 61 brittle ruptures per sample (i.e., ). The ruptures were predominately oriented in the machine direction and located (1) directly beneath a gravel contact, (2) at the side of a gravel indentation, or (3) between gravel indentations. The ruptures between gravel indentations were the least frequent but largest. The calculated strains perpendicular to the rupture direction were . Rupture occurred, although the average stress-crack resistance for all ruptured geomembrane samples still was approximately , with a minimum of 360 h. These results indicate the importance of minimizing tensile strains in the geomembrane in the design of a liner system.
Service Life of a High-Density Polyethylene Geomembrane under Simulated Landfill Conditions at 85°C
The time to rupture of a 1.5-mm-thick high-density polyethylene geomembrane aged in a typical landfill composite liner configuration is investigated under a pressure of 250 kPa at 85°C. The geomembrane was underlain with a geosynthetic clay liner and had a needle-pinched nonwoven geotextile protection layer separating it from 50 mm of drainage gravel containing leachate. Seventeen (0.6-m-diameter) tests were conducted. In addition to 9 months required to deplete antioxidants (Stage I), the tests indicated a lag period (Stage II) of 5.5 months and a time from the start of degradation to rupture (Stage III) of 20 months, giving a total inferred time to rupture of 34.5 months (2.9 years). There were up to 61 brittle ruptures per sample (i.e., ). The ruptures were predominately oriented in the machine direction and located (1) directly beneath a gravel contact, (2) at the side of a gravel indentation, or (3) between gravel indentations. The ruptures between gravel indentations were the least frequent but largest. The calculated strains perpendicular to the rupture direction were . Rupture occurred, although the average stress-crack resistance for all ruptured geomembrane samples still was approximately , with a minimum of 360 h. These results indicate the importance of minimizing tensile strains in the geomembrane in the design of a liner system.
Service Life of a High-Density Polyethylene Geomembrane under Simulated Landfill Conditions at 85°C
Ewais, A. M. R. (author) / Rowe, R. Kerry (author) / Brachman, R. W. I. (author) / Arnepalli, D. N. (author)
2014-07-28
Article (Journal)
Electronic Resource
Unknown
Service Life of a High-Density Polyethylene Geomembrane under Simulated Landfill Conditions at 85^oC
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