Abstract
A mercury-mercuric oxide (Hg/HgO) reference electrode to be embedded in concrete structures was developed. Its electrochemical behaviour in both saturated calcium hydroxide solution and synthetic solution used to simulate the pore concrete solution was determined. A potential difference of −52 ± 2 mV(SCE) in calcium hydroxide solution, and −136 ± 12 mV(SCE) in pore solution, was observed as a function of time at pH in the range 12.4–12.6. Its reversibility was compared to a Ag/AgCl electrode. Levels of chloride up to 0.12% did not significantly affect the potential of the Hg/HgO reference electrode. Its stability in concrete cylinders was demonstrated.
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