Apparatus for Testing the Combined Effects of Deformation and Chemical Exposure on Polymeric Liners
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 3
Abstract
A new experimental apparatus was developed for determining the combined effects of mechanical stress and chemical exposure on the long-term durability of polymeric liners, which are widely used in civil and environmental engineering applications. The apparatus is capable of bending and holding up to 12 coupon-type specimens at predetermined levels of deflection while simultaneously exposing the specimens to a chemical solution bath. The apparatus was used to study the effects of three levels of deformation of 0.0, 0.03, and 0.08 mm/mm normalized deflection at the midspan of high-density polyethylene (HDPE) and low-density polyethylene (LDPE) specimens ( or ). The bent specimens were immersed in deionized water, chlorine (3 or 800 mg/L) or trichloroethylene (TCE) (3 or 1,000 mg/L) solution baths. The specimens were then stored at a constant temperature (23, 50, or , 122, or ) for a predetermined period of 1,250, 2,500, 3,750, and 5,000 h. Results of the tests indicate that neither TCE nor chlorine affect the modulus of elasticity of the tested HDPE and LDPE materials, whereas deformation at 8% normalized deflection (in deionized water and the chemical solutions) reduced the flexural modulus of elasticity of HDPE. In addition, elevated temperature combined with deformation had a notable effect on the ultimate strength of HDPE and elevated temperature only made all of the LDPE specimens fail.
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Acknowledgments
This work was performed at Tulane University as a part of the primary writer’s doctoral dissertation. The study was supported by the Spaar Family Endowment and J. Bennett Johnston Science Foundation under Grant No. UNSPECIFIED78. The writers thank Richard Hart, Paul Ziehl, Daniel De Kee, Juan Hinestroza, and San Hla Aung, for their technical advice, Ana Maria Ocampo for chemical analyses, and Anthony Jensen and Mickey Alexander for assistance in designing and fabricating the bending apparatus.
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© 2010 ASCE.
History
Received: Jan 4, 2008
Accepted: Oct 16, 2009
Published online: Feb 12, 2010
Published in print: Mar 2010
Notes
Note. Associate Editor: Hilary I. Inyang
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