January 25, 2015

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Austin's Zahirul Islam Co-Authors Two Journal Articles on HDPE Geomembrane Durability

AUSTIN, TX — Geosyntec staff member Zahirul Islam, Ph.D., P.E., P.Eng., co-authored two journal articles on the durability of high density polyethylene (HDPE) geomembrane in landfill application.

The first article, "Aging of High Density Polyethylene Geomembranes of Three Different Thicknesses", was published in the ASCE Journal of Geotechnical and Geoenvironmental Engineering (Vol. 140, No. 5, 2014). Other co-authors of this article were R. Kerry Rowe and Fady Abdelaal of GeoEngineering Centre at Queen's University in Kingston, Ontario, Canada. In this article, Zahirul and his co-authors investigated the effects of geomembrane thickness (1.5 mm (60 mil), 2.0 mm (80 mil), and 2.5 mm (100 mil)) on aging when immersed in a synthetic leachate. Based on the data at five different temperatures (55, 65, 70, 75, and 85oC), the results suggested that the thickness of the geomembrane has a significant effect on the service life of geomembrane with the thicker geomembrane giving the longest time to failure, other things being equal.

The second article, "Effect of Leachate Composition on the Long-term Performance of a HDPE Geomembrane", was published in the Geotextiles and Geomembranes journal (Vol. 42, No. 4, 2014). Other co-authors of this article were the same as the first article. Zahirul and his co-authors investigated in this article the effect of leachate constituents on the timing and magnitude of the changes in the physical properties of the geomembrane. The results showed very similar predictions of the antioxidant depletion stage (the first stage of geomembrane service life) in all leachates; however, the leachates with salts were shown to have the largest effect on the geomembrane mechanical properties, especially stress-crack resistance, resulting in a shorter time to nominal failure than for leachates without salts. Arrhenius modeling was used to predict the time to nominal failure (i.e., a reduction in stress-crack resistance to 150 hours) at a range of temperatures.

For more information about these articles and geomembrane durability, contact Zahirul in Geosyntec's Austin, Texas, office at 512.451.4003 or This email address is being protected from spambots. You need JavaScript enabled to view it..