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Two types of impressed current cathodic protection and a sacrificial method were used to protect over 100000m2 of reinforced concrete caissons and deck slab of a new ship repair yard. This paper describes the CP and monitoring systems used and compares the monitoring results from the different types of system and probe.
Two types of impressed current cathodic protection and a sacrificial method were used to protect over 100000m2 of reinforced concrete caissons and deck slab of a new ship repair yard. The structures comprised of 53 caissons weighing 4000 tonnes each forming over 2km of quays and piers. The specification required that the systems were monitored using Reference Electrodes coupons and current pick up probes. All current adjustments and monitoring was to be from one central location.This paper describes the CP and monitoring systems used and compares the monitoring results from the different types of system and probe. Slip forming of the pre cast caissons presented unique problems that had to be overcome and the sheer size of the installation made monitoring and performance testing a challenge. The performance of the CP systems and the remote monitoring and control system are discussed in detail.
Key words: downloadable, Impressed, current cathodic protection, concrete, slipform, tidal, remote monitoring, depolarisation, sacrificial
An effective and efficient impressed cathodic protection system by laying a continuous shallow anodes bed in close proximity to the tank foundation. Some of the merits of this installation include elimination of shielding effects or interference from other structures and uniform protection of the entire tank bottom.
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How calcareous deposits formation in seawater influences the performance of a galvanic cathodic protection (CP) system in seawater. Coupling current measured. A resistance set between the cathode and the anode simulated circuit resistance of CP. Steel cathode potential over immersion time. Calcareous deposits analyzed by X-Ray Diffraction.
Chloride induced corrosion is recognized as a significant disease in the nation's concrete infrastructure. This paper will provide an overview of the various corrosion mitigation techniques available and then focus on two innovative methods of using discrete anodes embedded within the concrete to provide corrosion protection to existing structures.