Development of Wireless Monitoring System WIMO<sup>Ⓡ</sup> Using RFID Technology and Its Application to Concrete Structures

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  • RFID構造物診断技術「WIMO<sup>Ⓡ</sup>」の概要と適用事例

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 Reinforced concrete structures in a high chloride environment are subject to the risks of corrosion. Although it is important to inspect chloride penetration depth in them, the inspection process usually causes irreversible damage to them during the corrective maintenance. Maintenance can be reasonably planned by using a non-destructive method to predict when corrosion will occur. Radio frequency identification (RFID) is a method of uniquely identifying an object by means of wireless radio transmission. Concrete structures will be more efficiently maintained if RFID with sensory functions can be used as a non-destructive inspection method to monitor the condition of structures. We have developed a wireless monitoring system for concrete structures, named WIMOⓇ, using the RFID technology. Wireless corrosion sensors in the system are embedded in reinforced concrete to predict the time when corrosion of the steel bars occurs. Verification experiment was carried out with multiple sensor specimens tagged to individual steel specimens and embedded in concrete which was exposed to an environment with excessive chlorides. Inspection was performed, and the results verified that the corrosion sensors worked properly as expected. This system is already in practical application in both newly constructed and renovated structures.

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