11 April 2006 Wireless threshold sensors for detecting corrosion in reinforced concrete structures
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The long-term reliability of a threshold corrosion sensor is demonstrated using data collected during two series of exposure tests. The sensors were embedded in concrete and interrogated in a wireless manner using inductive coupling. The frequency signature of the sensor changes after a steel sensing wire corrodes, providing a convenient and noninvasive technique for determining when a threshold amount of corrosion has occurred in a reinforced concrete structure. In the first series of exposure tests, the sensors were embedded in concrete prisms, which were exposed to a variety of temperature and moisture conditions over a six-month period. In the second series of tests, the sensors were embedded in reinforced concrete slabs. The slabs have been subjected to sustained loads and alternating wet and dry cycles for the past year. Data from both test series indicate that the threshold sensors are functioning as designed.
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Nathan P. Dickerson, Nathan P. Dickerson, Matthew M. Andringa, Matthew M. Andringa, John M. Puryear, John M. Puryear, Sharon L. Wood, Sharon L. Wood, Dean P. Neikirk, Dean P. Neikirk, } "Wireless threshold sensors for detecting corrosion in reinforced concrete structures", Proc. SPIE 6174, Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, 61741L (11 April 2006); doi: 10.1117/12.658711; https://doi.org/10.1117/12.658711

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