Electrode potential, constant anodic current polarisation, and electrical resistance probe measurements have been employed to investigate the corrosion of mild steel in concrete and cement/water grouts. The usefulness of the data obtained is discussed and corrosion threshold sodium chloride concentrations reported. The influence of moisture content on the electrode potential measurements is examined and shown to be of critical significance. It is indicated that corrosion threshold data are dependent on exposure conditions and surface state of the steel and the difficulty in relating results in calcium hydroxide solutions and concrete is described.

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