Polyolefin geosynthetics have to be stabilized by antioxidants (AO) to achieve life-times as required for geotechnical application. Two classes of AO packages are typically used for geosynthetics: (1) a combination of steric hindered phenols and phosphites, (2) hindered amines in combination with a marginal process stabilization. Depletion of the AO and degradation of plastic products show specific features. We argue that the exudation of the antioxidants is of paramount importance. This is discussed within the framework of a three processes model. Process A: AO deplete. Process B: induction period of the depleted material. Process C: degradation impairs properties of the product. In case of package (1) the processes follow each other consecutively. In case of package (2) process A overlaps with process B and C. Estimates of life-times are given for HDPE geomembranes (package (1)) and PP geotextiles (package (2)). Against this background high pressure autoclave testing is evaluated.

Oxidative resistance of PE and PP geosynthetics

248th National Meeting (2014)

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