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02256 CATHODIC PROTECTION SHORTING STRAP INDUCED CORROSION AND FAILURE OF PRESTRESSED CONCRETE PIPE

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Prestressed concrete cylinder pipe pipeline sections projected to exhibit wire breaks were detected - and one not so -  were excavated, removed, inspected, and dissected. Corrosion had initiated upon the inner surface of shorting straps and spread to the prestressing wires.  A mechanism for this corrosion is presented and the findings discussed.

Product Number: 51300-02256-SG
ISBN: 02256 2002 CP
Author: William H. Hartt and Richard O. Lewis
Publication Date: 2002
Industries: Pipelines, Tanks, and Underground Systems , Corrosion Monitoring and Control
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As part of qualifying a prestressed concrete cylinder pipe (PCCP) pipeline for possible cathodic protection, six sections that were projected from prior eddy current testing to exhibit wire breaks and one for which no breaks were detected were excavated, removed intact, inspected, and dissected. It was disclosed that corrosion had preferentially initiated upon the inner surface of longitudinal shorting straps and spread from these to the prestressing wires. Left unaddressed, the corrosion would eventually lead to pipe rupture. A mechanism for this corrosion is presented, and the findings are discussed within the context of utility and effectiveness of cathodic protection for PCCP.

Key Words: Prestressed concrete cylinder pipe, corrosion, cathodic protection, longitudinal shorting strap, chlorides, carbonation, prestressing steel wire.

As part of qualifying a prestressed concrete cylinder pipe (PCCP) pipeline for possible cathodic protection, six sections that were projected from prior eddy current testing to exhibit wire breaks and one for which no breaks were detected were excavated, removed intact, inspected, and dissected. It was disclosed that corrosion had preferentially initiated upon the inner surface of longitudinal shorting straps and spread from these to the prestressing wires. Left unaddressed, the corrosion would eventually lead to pipe rupture. A mechanism for this corrosion is presented, and the findings are discussed within the context of utility and effectiveness of cathodic protection for PCCP.

Key Words: Prestressed concrete cylinder pipe, corrosion, cathodic protection, longitudinal shorting strap, chlorides, carbonation, prestressing steel wire.

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