Concrete resistivity is a significant parameter to evaluate the durability of reinforced concrete structures. It can be determined non-destructively by using a four-electrode setup. However reinforcement bars as well as layers with different resistivities have a significant influence on the readings. In the case of a four-electrode measurement the apparent resistivity is commonly determined on the base of a semi-spherical distribution of the current in the concrete which does not fully reflect the real situation. For surface layers a cylindrical approach is presented to describe this phenomenon analytically. The influences of reinforcement bars are more complex to specify. Fundamental investigations are made experimentally in solution and by numerical simulations.

Subject
Electric current, Concrete surfaces, Electrolyte resistance, Electrical resistivity, Current distribution, Layer thickness, Surface layers, Electric potential, Electrodes, Concrete, Reinforcement, Electrolytes, Electrode potential
Keywords:
non destructive testing, resistivity, Wenner method, concrete, reinforcement, diagnoses
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2012
Association for Materials Protection and Performance (AMPP)
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