Effect of Wrinkles on the Circumferential Strength of a Cast-in-Place Composite Polymer Liner Used in Retrofitting Pressure Pipes
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 12
Abstract
This paper examines a cast-in-place composite polymer liner used in retrofitting cracked cast iron pressure water pipes. The installation of the liner can result in the formation of geometric imperfections (wrinkles) of different patterns and sizes if the external circumference of the liner exceeds the internal circumference of the host pipe. A series of split-disk tests were conducted on 25-mm wide ring samples of the polymer liner to examine the effects of the presence of three different wrinkle configurations, the loading rate, and cyclic loading on the circumferential strength of the liner. In all the test samples, cracking of the resin occurred at the wrinkle, but ultimate capacity was always greater than the cracking load. A reduction in the ultimate hoop strength of up to 23% occurred, depending on the wrinkle pattern. Cyclic loading corresponding to 50-year service life was applied, leading the resin in some samples to crack at the wrinkle. At a very slow loading rate of 0.1 mm/min, the ultimate strength of the liner was reduced by 16%.
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Acknowledgments
This research was funded by a Strategic Research Grant from the Natural Sciences and Engineering Research Council (NSERC) of Canada. The support of Kevin Bainbridge and the City of Hamilton, Ontario, Canada, who provided the test samples, is gratefully acknowledged.NSERC
References
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Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 12 • December 2010
Pages: 1304 - 1314
Copyright
© 2010 ASCE.
History
Received: Nov 6, 2008
Accepted: Aug 3, 2010
Published online: Aug 5, 2010
Published in print: Dec 2010
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