Accelerated Investigation of Media Impact on Polyethylene Geomembranes

Geomembranes are applied in a wide range of engineering barrier systems, where among vari-ous complex impacts at least one property is in common, the requirement of extraordinary me-dia resistance (Scheirs 2009). Polyethylene with high density (PE-HD) shows a remarkable good resistance against various aggressive liquids, making it suitable for landfills, hazardous waste ponds and reservoirs. Physical and chemical aging of the material are commonly investi-gated by means of time-consuming immersion tests with subsequent tensile tests (Müller 2007). The present study deals with a new fracture mechanics characterization method combining cyclic tests with cracked round bars (CRB) and a special glass media cell for a defined environment.

A PE-HD grade for geomembrane applications in two different compounding, one carbon black filled and one natural material was investigated concerning physical and chemical aging. Cyclic Cracked Round Bar (CRB) tests were conducted on unexposed and ex-posed specimens in air and within environmental tests of unexposed specimens in a media cell. Additional immersion tests with subsequent tensile tests, Oxidation Induction Time (OIT) measurement and Infrared (IR)-spectroscopy were carried out. Films as well as a series of CRB specimens were exposed to a 10 % aqueous solution of Arkopal® N110 and a 20 % aqueous so-lution of sodium chloride. A reduction of the stiffness was found for both materials under the impact of both media. The environmental cyclic CRB tests in the media cell showed comparable results to the conventional methods.

Copyright: © Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben
Quelle: Depotech 2012 (November 2012)
Seiten: 2
Preis: € 1,00
Autor: A. Redhead
Dr. Andreas Frank
Univ.-Prof. Dr. Gerald Pinter

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