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10121 Cathodic Protection Monitoring of Prestressed Concrete Cylinder Pipe (PCCP)

Picture for 10121 Cathodic Protection Monitoring of Prestressed Concrete Cylinder Pipe (PCCP)
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Product Number: 51300-10121-SG
ISBN: 10121 2010 CP
Author: Yanxia Du, Lei Zhang, Lining Xu, Minxu Lu
Publication Date: 2010
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$20.00
$20.00
In the South-North Water Transportation Project of China, a kind of prestressed concrete cylinder pipe (PCCP) with 4m in diameter is applied, and sacrificial anodes are used to prevent the prestressed wires inside PCCP from corrosion. To evaluate the cathodic protection system, a new type of test coupon is developed to measure both the polarized potential and the native potential of the prestressed wires in PCCP. In this paper, details about the test coupon’s interior structure, as well as its functions and the performances of the embedded electrode reference are discussed. Besides, some modeling experiments are also conducted to study the coupon’s performances, and both the test data of modeling experiments and measured data in the field show that the test coupon is capable of monitoring the cathodic protection of PCCP.

Key words: prestressed concrete cylinder pipe, cathodic protection, test coupon, structure design, MnO2 reference electrode
In the South-North Water Transportation Project of China, a kind of prestressed concrete cylinder pipe (PCCP) with 4m in diameter is applied, and sacrificial anodes are used to prevent the prestressed wires inside PCCP from corrosion. To evaluate the cathodic protection system, a new type of test coupon is developed to measure both the polarized potential and the native potential of the prestressed wires in PCCP. In this paper, details about the test coupon’s interior structure, as well as its functions and the performances of the embedded electrode reference are discussed. Besides, some modeling experiments are also conducted to study the coupon’s performances, and both the test data of modeling experiments and measured data in the field show that the test coupon is capable of monitoring the cathodic protection of PCCP.

Key words: prestressed concrete cylinder pipe, cathodic protection, test coupon, structure design, MnO2 reference electrode
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Some of many hundreds of miles of prestressed pipe installed in the late 1960’sand 1970’s have failed due to corrosion of the prestressing wire. Is it safe to follow conventional CP protection guidelines?  Should the protection criteria be selected by age and condition of the pipeline, physical and mechanical properties of the wire, and the environmental conditions surrounding the pipeline?
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