Durability of Hdpe Geomembranes: An Overview

Lavoie, Fernando Luiz; Kobelnik, Marcelo; Valentin, Clever Aparecido; Silva, Jefferson Lins da

doi:10.21577/0100-4042.20170540

Cited by 13 publications

(12 citation statements)

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“…and HP) than the minimum required values of the American standard. It can be seen that the amount of antioxidants has been severely reduced for antioxidants that work in the temperature range of 200 • C, which represents the beginning of a chain reaction, and changes in molecular composition begin [34]. The MIN2 sample, which presents the longer field exposure time, showed the lowest Std.…”

Section: Discussionmentioning

confidence: 99%

Environmental Protection with HDPE Geomembranes in Mining Facility Constructions

Lavoie

Kobelnik

Valentin

et al. 2021

Construction Materials

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The present work evaluated two high-density polyethylene (HDPE) geomembranes exhumed from mining facility constructions in Brazil. The MIN sample was exhumed from a pond for water use for the iron ore process after 7.92 years of exposure. The MIN2 sample was exhumed from a spillway channel of a ferronickel tailing dam after 10.08 years of service. The physical evaluations showed high depletion for antioxidants that work in the temperature range of 200 °C. The samples presented brittle tensile behavior and had similar behaviors between stress cracking and tensile. Low tensile elongation values and low-stress crack resistance were noted. The MIN2 sample presented a higher melt flow index (MFI) value and lower stress crack resistance. Thermogravimetric curves (TG) under synthetic air purge gas evaluation showed that both samples presented a similar behavior during the evaluation but had several mass losses. The results showed that exothermic and endothermic events occurred with loss of mass and showed no combustion events in the differential thermal analysis (DTA) curve evaluation. Differential scanning calorimetry (DSC) analysis showed no changes in the samples’ behavior. Thus, the results of tensile, stress cracking, and viscosity properties can demonstrate that changes in polymer structure occurred after field exposures.

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Section: Discussionmentioning

confidence: 99%

Environmental Protection with HDPE Geomembranes in Mining Facility Constructions

Lavoie

Kobelnik

Valentin

et al. 2021

Construction Materials

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“…However, it is difficult to protect synthetic membranes from damage. This, together with uncertainty about the long-term durability [23,24] and degradation of synthetic lining systems in a harsh chemical environment at the base of the landfills [25,26], increases the possibility of liner failure at some stage in the future when the waste is still active, leading to groundwater pollution by landfill leachate [22,27]. There is no single ideal liner material.…”

Section: Geotechnical Aspects Of the New Vinča Landfill Projectmentioning

confidence: 99%

Assessment of the Landfill Barrier System through Numerical Analysis: Rehabilitation and Expansion of Belgrade Landfill Case Study

Štefaňák

Chalmovský

2022

Sustainability

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There are still many unmanaged landfills around the world that pose significant potential environmental problems. One of the largest unmanaged landfills in Europe, which has been used for more than 40 years to deposit waste from Serbia’s capital, Belgrade, is the Vinča landfill. A revitalization and extension of this landfill was proposed that would allow its sustainable operation in the future. The revitalization project considered building a capping layer on the surface of the current landfill, which will close it and which will serve as a liner on the bottom of the new landfill. The use of a composite system including a HDPE geomembrane is considered in the project. New landfill settlements were predicted using the FEM method utilizing a Hardening-soil constitutive model for subgrade. Both immediate settlements of subgrade caused by waste deposition and primary consolidation settlement were calculated. The results show that a substantial increase in the settlement of the geomembrane subgrade can be expected during the primary consolidation period, due to the high rate of filling compared to the permeability of the subgrade. The total settlement of the new landfill in its crown is expected to be between 2.73 and 4.52 m. The axial force in the geomembrane will not exceed the tensile strength of the membrane at any time during or after the new landfill operation.

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“…These exposures can change the polyethylene's morphology, causing a reaction between the polymer chain with the oxygen molecule. Accelerated laboratory tests and exhumed sample evaluations indicate essential responses for the durability issue [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study of the Ultraviolet Radiation Effect on an HDPE Geomembrane

et al. 2021

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High-density polyethylene (HDPE) geomembranes are polymeric geosynthetic materials usually applied as a liner in environmental facilities due to their good mechanical properties, good welding conditions, and excellent chemical resistance. A geomembrane’s field performance is affected by different conditions and exposures, including ultraviolet radiation, thermal and oxidative exposure, and chemical contact. This article presents an experimental study with a 1.0 mm-thick HDPE virgin geomembrane exposed by the Xenon arc weatherometer for 2160 h and the ultraviolet fluorescent weatherometer for 8760 h to understand the geomembrane’s behavior under ultraviolet exposure. The evaluation was performed using the melt flow index (MFI) test, oxidative-induction time (OIT) tests, tensile test, differential scanning calorimetry (DSC) analysis, and Fourier transform infrared spectroscopy (FTIR) analysis. The sample exposed in the Xenon arc equipment showed a tendency to increase the MFI values during the exposure time. This upward trend may indicate morphological changes in the polymer. The tensile behavior analysis showed a tendency of the sample to lose ductility, without showing brittle behavior. The samples’ OIT test results under both device exposures showed faster antioxidant depletion for the standard OIT test than the high-pressure OIT test. The DSC and FTIR analyses did not demonstrate the polymer’s changes.

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Durability of Hdpe Geomembranes: An Overview

Cited by 13 publications

References 0 publications

Environmental Protection with HDPE Geomembranes in Mining Facility Constructions

Environmental Protection with HDPE Geomembranes in Mining Facility Constructions

Assessment of the Landfill Barrier System through Numerical Analysis: Rehabilitation and Expansion of Belgrade Landfill Case Study

Laboratory Study of the Ultraviolet Radiation Effect on an HDPE Geomembrane

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