Measuring the Electrical Resistivity of concrete by Bulk, Surface, Galvapulse and the Electrical Conductivity methods

Document Type : Research Paper

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The deterioration of reinforced concrete structures is one of the most important issues that the cost of repair or replacement will cause great economic losses. One of the main reasons for these detriments is corrosion of embedded steel reinforcement in concrete. Field measurement of electrical resistivity of concrete is mainly used as an indicator of corrosion activity. Electrical resistivity is an important component of the Corrosion cell. Most resistance causes less corrosion current to flow between the anode and cathode regions. As a result, the electrical resistivity plays an important role in controlling the corrosion rate of steel reinforcement.
In this article various methods of measuring the electrical resistivity of concrete such as Bulk, surface (wenner), Galva pulse and electrical conductivity (ASTM C1760) methods are compared with each other. Two normal concrete mix with water to cement ratio of 4.0 and the 375 and 425 kg of cement per cubic meter and 3 scc mixes with water cement ratio of 4.0 include VMA materials, stone powder and simple scc mix was built and planned tests at ages 7, 28 and 90 days on which they were made. The results indicate a strong correlation between different methods of measurement.

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