http://worldcat.org/entity/work/id/1913769974

Corrosion monitoring research of New York City bridges

In this study, an integrated methodology was developed that uses state-of-the-art sensing capabilities and non-destructive evaluation (NDE) technologies to assess the cable condition. A smart sensor system integrated with NDE technologies is an approach that shows potential for assessing the condition of suspension bridge cables. NDE technologies for direct detection of the corrosion damage (i.e., main flux method, magnetostrictive technology, and acoustic emission technology) were implemented, validated, and tested for suspension bridge cable applications. In addition, a network of sensors that can monitor the external and internal environment of such cables and provide information that can be used to indirectly assess the cable's deterioration conditions and their evolution over time were assembled and extensively tested. To recreate conditions as close as possible to real operating conditions, a cable mockup, which was 20 inches (508 mm) in diameter and 20 ft (6.1 m) long and subjected to 1,100 kips (4,893,043.76 N) and fully instrumented, was built at Columbia University and tested in an enclosed accelerated corrosion chamber. The same system was then installed on two panels of the Manhattan Bridge, and measurements of temperature, relative humidity, and corrosion rate in the cable interior were successfully recorded for almost 1 year from November 2010 to September 2011.

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