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Chloride ions pose another corrosion
threat to reinforcing steel in concrete. Typically chloride ions from deicing salts, salt spray, or seawater will penetrate the concrete through pores in the hydrated cement, eventually reaching the steel rebar and accumulating to a concentra- tion level where the reinforcing steel's XZW\MK\Q^M ÅTU Q[ LM[\ZWaML TMI^QVO Q\ vulnerable to corrosion when oxygen and moisture are present in the steel-concrete interface. The chloride probes, also placed at different depths in the concrete layer over the steel rebar, will measure the amount of chloride ions that has XMVM\ZI\ML \PM KWVKZM\M
additional grant from the EPSRC to ex- plore the commercial potential of these [MV[WZ[ 8TIV[ KITT NWZ ZMÅVQVO \PM XZWJM designs, in particular the chloride sensor probe, as well as additional testing to further model the approximate service life of the probes. Currently the research team is negotiating license agreements with companies to commercialize the sensor technologies. Contact Luke Nava, City University senior KWUU]VQKI\QWV[ WNÅKMZ¸M UIQT" T]SM VI^I ( KQ\a IK ]S
NACE International, Vol. 51, No. 3 March 2012 MATERIALS PERFORMANCE 19
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