Role of Grout Strength and Liners on the Performance of Slip-Lined Pipes
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 6, Issue 4
Abstract
As infrastructure built during the 20th century reaches the end of its service life, engineers and managers are increasingly turning to rehabilitation rather than replacement to potentially reduce costs. For corrugated steel pipes and culverts, one such rehabilitation alternative is to use slip lining where a liner (new pipe) is placed inside the existing deteriorated pipe and the space between them is grouted. The current research seeks to better understand the performance of slip-lined systems by (1) characterizing the properties of a low-strength and a high-strength grout; (2) conducting a series of pipe tests to determine the load-carrying capacity and stiffness of a corrugated steel pipe and pipes that have been rehabilitated with slip liners; (3) understand the impact of grout strength and the liner on pipe stiffness and strength; and (4) determine the level of composite action in the pipe system by using a plasticity approach to estimate the load-carrying capacity of the system. The pipes rehabilitated with low-strength grout had increased strength (three times greater) and stiffness (eight times greater) versus an unrehabilitated pipe, whereas the specimens rehabilitated with high-strength grout showed higher increases in both load-carrying capacity (ten times greater) and stiffness (50 times greater) over the unrehabilitated pipe. The high density polyethylene (HDPE) liner had no impact on the load-carrying capacity of the specimens with high-strength grout and required large diameter changes to enhance the load-carrying capacity of low-strength grout specimens. A plasticity approach was used to estimate the load-carrying capacity of the specimens and indicated that for these tests, composite behavior between the grout and the corrugated steel pipe was developed.
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Acknowledgments
The authors are grateful to the Natural Science and Engineering Research Council of Canada and the Canada Foundation for Innovation for their generous financial support of this research. The authors would also like to thank Michel Lessard, Bill Corradetti, John Vye, and Danny Salvo from Euclid Chemical and Gerry Groen from KWH Pipe for donating time and materials in support of this research. Finally, Graeme Boyd, Brian Westervelt, Jaime Escobar, David Becerril García, Caleb Regier, Alex Burnett, Kenneth Mak, Jane Peter, and Adam Hoag all provided valuable support for this research.
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Information & Authors
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 6 • Issue 4 • November 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 3, 2014
Accepted: Jan 21, 2015
Published online: Apr 17, 2015
Discussion open until: Sep 17, 2015
Published in print: Nov 1, 2015
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