Published in

Elsevier, Procedia Engineering, (120), p. 965-968

DOI: 10.1016/j.proeng.2015.08.827



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Connecting to Concrete: Wireless Monitoring of Chloride ions in Concrete structures

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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For the first time, chloride ions are measured wirelessly in concrete. The half-cell potential of a silver/silver chloride (Ag/AgCl) electrode, which corresponds to the concentration of chloride ions, is measured wirelessly. Wireless communication is achieved by an inductive coupling (reflected-impedance) between the coils of the sensor and the readout. The resonance frequency of the sensor coil changes due to the change in the capacitance of a varactor element connected to the Ag/AgCl electrode. The capacitance of the varactor increases with the increase in chloride ion concentration (20 pF/decade). Furthermore, the capacitance can be reliability measured up to a distance of 35 mm between sensor and readout coil. No battery is needed to power the sensor terminal, which makes it feasible to embed it in concrete structures.