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Carbon Fiber Fracture and Delamination.

Carbon Fiber Fracture and Delamination.

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Most urban areas in the world have water infrastructure systems, including the buried sewer and water pipelines, which are assessed as in need of extensive rehabilitation. Deterioration by many other factors affects structural integrity. Trenchless technologies such as Cured-in-Place Pipe (CIPP) are now applied in numerous projects while minimizing...

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... sample groups using regular 2 mm felt layers in Figure 5b,c exhibit similar deflection patterns to the resin (N). Figure 5d,e show the carbon fiber is highly stiff at the beginning, but it fails less than 3 percent deflection. Figure 6 illustrates an example of carbon fiber layered samples that fractured and clearly delaminated after three-point bend tests. It is found that the unsaturated polyester resin used for typical CIPPs is not suitable to acquire sufficient bonding strength with carbon fiber. ...

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