Evaluation of the longitudinal restraint, uplift resistance, and long-term performance of high-density polyethylene crosstie rail support system using static and cyclic loading

The effect of a synthetic municipal solid waste leachate on the long-term performance of dual-wedge welds in a 1.5 mm thick high-density polyethylene geomembrane (GMB) is reported based on 4 years of testing at 40, 65, 75, and 85 °C. The effect of leachate on the GMB well away from the weld, in the heat-affected zone (HAZ) beside the weld, and in the welded zone are investigated. The slowest antioxidant depletion rate was in the weld itself and the fastest rate for the HAZ adjacent to the weld. The shear break and peel break properties started to decrease after the standard oxidative induction time had depleted to residual, but before the high-pressure oxidative induction time had reached residual. Failures occured at the HAZ adjacent to weld in both the shear and peel tests. No failure of the seam itself was observed. The times to nominal failure of the GMB in the critical HAZ are predicted. The rate of degradation in the weld and sheet are compared.

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Finite element analysis of long-term performance of buried high density polyethylene pipes

10.33915/etd.1769 ◽

2006 ◽

Author(s):

Raj Kumar Gondle

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

High Density Polyethylene ◽

High Density ◽

Element Analysis ◽

Polyethylene Pipes ◽

Long Term Performance ◽

Term Performance

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Exhumation and performance of an Antarctic composite barrier system after 4 years exposure

Canadian Geotechnical Journal ◽

10.1139/cgj-2018-0715 ◽

2020 ◽

Vol 57 (8) ◽

pp. 1130-1152 ◽

Cited By ~ 1

Author(s):

R.S. McWatters ◽

R.K. Rowe ◽

V. Di Battista ◽

B. Sfiligoj ◽

D. Wilkins ◽

...

Keyword(s):

High Density Polyethylene ◽

Soil Samples ◽

Composite Liner ◽

Subgrade Soil ◽

And Performance ◽

Long Term Performance ◽

Term Performance ◽

The Antarctic ◽

Coarse Gravel

An Antarctic biopile using a composite liner (high-density polyethylene geomembrane (GMB) over a geosynthetic clay liner (GCL)) was constructed on a coarse granular subgrade to contain hydrocarbon-contaminated soil and leachate. The soil was remediated after 4 years and the biopile was decommissioned. The liner was exhumed to assess the properties and performance of the GMB and GCL. There was no significant change in the GMB index properties. Although cobbles and coarse gravel of the subgrade had left indentations in the GMB, implying tensile strains that could impact long-term performance, there were no holes. There was significant variability in the hydration of the GCL (from 10% to 220%) and in the underlying subgrade soil water content (from 5% to 30%). This reflects the complexity of the subgrade and groundwater flow in the Antarctic environment. The exhumed GCL specimens had low hydraulic conductivity (1 × 10−11 to 7 × 10−11 m/s) at 13 kPa. Soil samples from below the composite liner showed no detectable hydrocarbons and confirmed no migration through the barrier. It is concluded that the composite barrier contained the leachate and biopile soil over the 4 years in service in the extreme Antarctic conditions.

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