CFRP Renewal of PCCP: An Overview

This paper presents the results of a three year research program on carbon fiber reinforced polymer (CFRP) renewal of Prestressed Concrete Cylinder Pipe (PCCP) sponsored by Water Research Foundation to form the theoretical and experimental basis of an AWWA Standard being developed for the same purpose. The paper identifies limit states related to strength, stability, and watertightness of the CFRP liner considering continual degradations of the host pipe. The design is based on Load and Resistance Factor Design (LRFD) approach with load and resistance factors selected to ensure reliability comparable to those of other construction products, material adjustment factors that account for durability, and time effect factor that account for the sustained load effects. The experimental phase of the research program included full-scale three-edge bearing tests and hydrostatic pressure tests, and laboratory testing of shear bond strength and resin ductility. The theoretical bases of design are simple design equations the accuracy or conservatism of which is established through comparison with detailed finite-element analysis.

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