Long-Term Properties of Cured-in-Place Pipe Liner Material
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 7
Abstract
Water pipe infrastructure, especially cast iron and asbestos cement, are close to or past their recommended service life. Rehabilitation of this existing water pipe infrastructure is critical to reduce replacement costs and water loss. Cured-in-place pipe (CIPP) liners are one method of pipe rehabilitation, and long-term properties are integral in the design of CIPP liners for water pipes. Limited studies have focused on testing and reporting of long-term properties, which are essential for the service life design of CIPP products. This paper aims to investigate the long-term properties of a CIPP liner under service conditions (static pressure and pressure transients). Three types of tests, namely, creep, creep rupture, and fatigue tests, were examined. Results indicated that the creep retention factor (0.18–0.27) at 50 years does not correspond to the long-term rupture tensile strength reduction factor (0.7) at 50 years. Long-term creep degradation curves show that, when subjecting the liner to constant stress, the short-term strength of the liner remains close to the initial tensile strength. The long-term strength reduction factor due to fatigue (0.73 at 100 million cycles) suggests this CIPP material is less influenced by pressure fatigue cycles. Therefore, the creep retention factor is not a true estimate of rupture strength or fatigue strength reduction.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request (material properties, creep, creep rupture, and fatigue data).
Acknowledgments
The Australian Government, through the Cooperative Research Centre (CRC), provided funding for the Smart Linings for Pipe and Infrastructure Project that produced this paper. The CRC Program supports industry-led collaborations between industry, researchers, and the community. The project was led by the Water Services Association of Australia (WSAA) and included the following project partners: Abergeldie Watertech, Bisley & Company, Calucem GmbH, Central Highlands Water, City West Water Corporation, Coliban Region Water Corporation, Downer, GeoTree Solutions, Hunter Water Corporation, Hychem International, Icon Water, Insituform Pacific, Interflow, Melbourne Water Corporation, MB Solutions, Metropolitan Restorations, Monash University, Nu Flow Technologies, Parchem Construction Supplies, Sanexen Environmental Services, SA Water Corporation, South East Water Corporation, Sydney Water Corporation, The Australasian Society for Trenchless Technology (ASTT), The Water Research Foundation, UK Water Industry Research Ltd (UKWIR), Unitywater, University of Sydney, University of Technology Sydney, Urban Utilities, Ventia, Water Corporation, Wilsons Pipe Solutions, and Yarra Valley Water, all of whom contributed expertise, labor, funding, products, or trial sites to assist in the delivery of this project. Materials for testing were provided by Sanexen and Ventia. The authors would like to thank Dr. Suranji Rathnayaka, Mr. Long Go, Mr. Zoltan Csaki, Mr. John Rebolledo, Mr. John Beadle, Mr. Sarvan Mani, and Mr. Gary Adamson.
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Journal of Materials in Civil Engineering
Volume 34 • Issue 7 • July 2022
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© 2022 American Society of Civil Engineers.
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Received: Jul 18, 2021
Accepted: Nov 1, 2021
Published online: Apr 19, 2022
Published in print: Jul 1, 2022
Discussion open until: Sep 19, 2022
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