Abstract
The electrical resistance of a surface-treated layer is generally indicative of its barrier properties, especially its resistance to ion diffusion. AC impedance measurements are rapid and non-destructive, and previous laboratory tests using a simple test cell geometry showed that it may be used to separate the electrical resistance of a surface treatment from that of the underlying concrete without physically separating the two. This suggests that AC impedance measurements might form the basis of anin situ method of characterising surface treatments on concrete.
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