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Abstract
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 disturbance in an urban environment. The main purpose of this study is to develop a high strength CIPP material using various composite materials (e.g., glass fiber, carbon fiber, polyester felt, unsaturated polyester resin, and others). Composite samples were made of the materials and tested using three-point bend apparatus to find mechanical properties, which include the flexural modulus, strength, and deflection. A composite combination with glass fibers with thin felt layers shows the best results in mechanical properties. Flexural modulus is a key factor for CIPP liner thickness design. Glass fiber composite yields between four and nine times higher values than the minimum value specified in the American Society for Testing and Materials (ASTM) F1216. This study provides a fundamental baseline for high strength CIPP liners that are capable of using conventional curing technologies.
Highlights
Sewer and water pipelines are key infrastructure systems in the urban environment, but the systems keep failing due to the structural degradation
The main purpose of this study is to find high strength composite materials that are suitable for further development in Cured-in-Place Pipe (CIPP) application
This paper presents a summary of mechanical test results and a comparison study of the various composite materials for CIPP rehabilitation
Summary
Sewer and water pipelines are key infrastructure systems in the urban environment, but the systems keep failing due to the structural degradation. Aging is the most significant reason for the structural deterioration of the buried infrastructure systems. Demand for capital improvement projects such as rehabilitation continuously increases as those systems keep failing. There is a huge gap in between the increasing rehabilitation demand and actual resources available. The structural assessment grade for sewer and water conveyance systems are D grade in the 2017 American society of civil engineers (ASCE) infrastructure report card [1]. Trenchless technology is a group of engineering and construction methods, which minimize open-cut excavation. The primary benefit of the trenchless technology is to significantly reduce surface disruption during the construction phase [2]
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