51315-6170-Passive Wireless Surface Acoustic Wave Sensors for Corrosion Monitoring of Steele Concrete

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Product Number: 51315-6170-SG

ISBN: 6170 2015 CP

Author: Mark Haines

Publication Date: 2015

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The Corrosion monitoring of steel-reinforced concrete structures with embedded sensors is a function that requires sensors with an operating life time defined in decades. Most common corrosion sensors used in concrete structures use embedded probes that require an electrical power source for proper operation. The power to the probe requires electrical wires from the probe through the concrete structure to the outside world. This may damage the integrity of the concrete structures. Other sensors may require the use electrochemical electrodes have several drawbacks such as short life time and recalibration requirement. Surface acoustic wave (SAW) sensors have been developed for corrosion monitoring of steel-reinforced concrete structures. Testing of the electrodes included response of the RF signal measurements after exposure to controlled accelerated corrosion in an attempt to calibrate corrosion damage to signal distortion. Also tested is the resistance of the sensors to exposure to concrete environment.These corrosion sensors were first characterized in terms of the RF signal propagation through concrete in a both laboratory and actual concrete structures. This paper will present measured RF signal responses through concrete that has been saturated with sea water in a laboratory setting. These SAW sensors were also embedded in outdoor structures in 2012. Field measured RF data taken in 2012 2013 and 2014 will also be presented in this paper.