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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.
Chloride induced corrosion is recognized as a significant disease in the nation's concrete infrastructure. Government agencies and private owners are forced to contend with the rising costs of maintaining their failing structures. In response to this need, a number of electrochemical techniques have been developed over the last two decades in order to provide some relief from the normal regime of 'chip and patch' repair, or whole-scale structure replacement. 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. The first of these methods uses gas vented discrete anodes to provide impressed current cathodic protection. Gas vented discrete anodes provide several key attributes which enable them to be a valuable tool for providing corrosion protection. Benefits of this anode system include; their ability to provide uniformity of protection to thick members, suitability for use on structures with low cover, structures with heavy reinforcement, and use on structures with membranes, coatings, or FRP systems. The second method to be covered is the use of embedded galvanic anodes to provide passive corrosion protection. These galvanic anodes have a lower operating potential and generally require less maintenance over their service life. These innovative discrete anodes provide the corrosion engineer with two more tools in the range of options available to cost effectively extend the life of corroding concrete structures.
Keywords: Chloride corrosion, concrete, electrochemical, mitigation, impressed current, cathodic protection
New cathodic protection (CP) criteria were developed based on AC and DC current densities measured using coupons. Using these criteria, the design of CP systems for newly constructed pipelines, paralleling high voltage AC power lines, and DC rail transit systems, was successfully performed.
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The objective of the research summarized in this paper was to define pipeline conditions where use of the 100-mV polarization criterion may be conducive to possible SCC problems. Paper Number 01592, presented at Corrosion/2001, summarized Part 1 of the research, in which the previous research results were analyzed. In this paper, the results of the laboratory testing are presented.
A close-interval potential (CIP) data survey on ~154 km of Crude Oil/Gas pipeline networks. This aim was to generate corrosion data to determine weak sections of the pipelines/flowlines and, to ascertain the effectiveness of the CP system and integrity of the Crude Oil/Gas pipeline networks. The pipeline networks were found safe for continued operation under its present condition.