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Title Material Characterization and Testing of Cured-in-Place Pipe to Resist Earthquake Related Ground Deformation
Publication Date
Date Accessioned
Degree M.S., Civil and Environmental Engineering
Discipline/Department Civil and Environmental Engineering
Degree Level masters
University/Publisher Cornell University
Abstract This thesis summarizes the testing procedures and key results of full-scale tests on Cured-In-Place Pipe (CIPP) to evaluate its performance under earthquake induced ground deformation. The CIPP used in this work is commercially available as Aqua-pipe, manufactured by Sanexen Environmental Services, Inc. to rehabilitate water mains. The investigation covered in this work includes tensile coupon tests, direct tension tests, friction tests, and direct shear tests. The test results improve the understanding and characterization of the axial force vs. displacement relationship for CIPP movement relative to the host pipe, lining/pipe interface friction, and the effects of geometry, internal pressure, and repeated loading on the axial force vs. relative displacement relationship. The direct tension test results show that the mobilization of axial force is affected by Mode II fracture propagation, friction between the exterior surface of the lining and interior surface of the host pipe, and geometric resistance generated by the relative movement of the lining within a host pipe of variable inside diameter. The most important finding from the direct tension tests is that substantial additional axial forces may be mobilized after debonding as the lining is affected by geometric interference caused by movement through a pipe with variable internal diameter. The test results provide a first-time confirmation of this loading mechanism. The friction tests show that the axial load response is independent of loading rate, with a similar load range and maximum load for the tests conducted at 1 in. (25 mm)/min, 10 in. (250 mm)/min, and 100 in. (2500 mm)/min. The first friction test, done under no pressure, developed larger axial forces due to the greater frictional resistance between the lining and pipe than in a subsequent test under the same testing conditions and geometry. The difference in the axial loads show that over-cleaned field pipes or new ductile iron pipes can have a greater frictional resistance between the lining and pipe than properly cleaned or previously loaded pipes. The most important result from the friction tests involves the influence of internal pressure on axial load response. As the internal pressure increased, the axial load for a given displacement increased linearly. Regressions of axial load vs. internal pressure at the same levels of displacement show a clear linear relationship with similar slopes. The results of the direct shear tests for new ductile iron and field cast iron pipes show a coefficient of friction of 0.61. This value represents the relatively smooth debonded lining surface conditions representative of the CIPP cleaning and lining process for old cast iron water mains. It also represents the interface between the lining and new ductile iron pipe after repeated displacements. The test results show that a coefficient of friction of 0.84 is a good estimate for lining/pipe interfaces that are rough and irregular.
Subjects/Keywords Civil engineering; cured-in-place; deformation; pipeline; earthquake
Contributors O'Rourke, Thomas Denis (chair); Stewart, Harry Eaton (committee member)
Language en
Country of Publication us
Record ID handle:1813/67679
Repository cornell
Date Retrieved
Date Indexed 2020-09-09
Grantor Cornell University
Issued Date 2019-08-30 00:00:00

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…Instrumentation List for Friction Tests ........................................................ 60 x CHAPTER 1 INTRODUCTION This thesis presents the results of material property and full-scale testing to characterize the performance of Cured-in-Place Pipe…

…shows the two layers of woven fabric before being treated with epoxy and cured in place. Figure 1.4 shows Aqua-pipe after curing inside of an existing pipeline. 1 Figure 1.1. Aqua-pipe Geotextile Lining Components Figure 1.2. Schematic of Warp and…

…through the pipeline between each access pit. The installation process begins by cleaning the pipe in-place. Then the lining infused with epoxy is pulled into place. Hot water or steam is run through the pipeline, curing the epoxy resin. Finally, a robot…

…longitudinal and circumferential directions, respectively. Tensile coupon specimens were cut and machined from flat cured lining sections and tested in accordance with ASTM–D3039 2017 (ASTM, 2017) for the specimens in the warp direction. Tensile…

…coupon specimens in the weft direction were cut and machined from flat cured lining sections and tested in accordance with ASTM-D638 2014 (ASTM, 2014). Tensile Coupon Testing and Procedure A Baldwin Hamilton 60 BTE Universal Testing Machine was…

…Lining after Curing ................................................... 3 Figure 2.1. Tensile Coupon Test Setup with Aqua-pipe Material .................................. 6 Figure 2.2. Schematic of Aqua-pipe Tensile Coupon Specimen in the Warp Direction 6…

…Figure 2.3. Schematic of Aqua-pipe Tensile Coupon Specimen in the Weft Direction 7 Figure 2.4. Stress vs. Strain Plots to Failure for Specimens in the Warp Direction....... 8 Figure 2.5. Stress vs. Strain Plots to Failure for Specimens in the Weft…

…Direction ....... 8 Figure 2.6. Expanded Stress vs. Strain Plots for Specimens in the Warp Direction ...... 8 Figure 2.7. Expanded Stress vs. Strain Plots for Specimens in the Weft Direction ....... 8 Figure 2.8. Transverse vs. Axial Strain for Tensile…