D-Load Strength of Concrete Pipes with Epoxy Linings
Publication: Journal of Pipeline Systems Engineering and Practice
Volume 10, Issue 4
Abstract
Concrete pipes are widely used in underground infrastructure and subject to different environmental conditions resulting in deterioration. Deteriorated pipes need to be rehabilitated to resume their normal service functions. One of the popular rehabilitation methods is spray-on cured-in-place lining, which has become increasingly popular due to its simplicity and cost efficiency. Rehabilitated concrete pipes form composite pipes and have different structural behaviors as compared to bare pipes. A good understanding of their behavior is essential to establish more efficient use and design of linings. In this study, third-point bending tests of concrete beams and concrete beam coated with epoxy were performed to determine their flexural strength. Three-edge bearing tests were performed on both unlined and lined concrete pipes. Results from the flexural beam tests are used to obtain tension softening curves for concrete with and without epoxy lining. FEM models of the third-point bending tests and three-edge bearing tests are created and validated with the experiment results. The validated FEM model of the three-edge bearing test is used to perform a parametric study on the effect of epoxy lining on the structural capacity of the lined pipes. The results indicate that by adding a 3-mm layer of epoxy lining inside the concrete pipe, the peak load increases only by 6% while 6- and 12-mm-thick liners result in 27% and 40% increases in the peak load, respectively.
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Acknowledgments
This work was partially supported by the Water Environmental Research Foundation (WERF) grant, Project No. INFR1R12. The financial support is acknowledged.
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Published In
Journal of Pipeline Systems Engineering and Practice
Volume 10 • Issue 4 • November 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 7, 2017
Accepted: Feb 12, 2019
Published online: Aug 21, 2019
Published in print: Nov 1, 2019
Discussion open until: Jan 21, 2020
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