Magnetic sensor for nondestructive evaluation of deteriorated prestressing strand.
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2011-08-01
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Edition:Phase I final report; August 2011.
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Abstract:This is a report describing the activities and accomplishments in this project, completed through November 30, 2009. The overall goal of this project is to investigate the feasibility of a magnetic sensor to detect in-situ corrosion of prestressing strand in prestressed concrete bridge beams. Corrosion is a slow developing phenomenon which is not adequately detected using sensors currently in service. Despite national studies, no effective nondestructive sensor technology has been identified for prestressing strand corrosion. An effective sensor for corrosion will be able to get a snapshot of the corrosion in time by sensing the corrosion by-products or a direct change in member properties due to corrosion. This is a departure from the typical procedure of measuring a quantity, such as strain, which is a secondary effect of corrosion. The need for the proposed sensor is particularly acute in Ohio where there are many prestressed box girder bridges.
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