Measurement techniques of electrical resistivity in atmospheric ordinary concrete structures


The electrical resistivity of the concrete controls the current between the anode area (metal oxidation) and cathodic area (reduction of oxygen) of the reinforcement corrosion. The intensity of this corrosion is greater when the electrical resistivity is low and there is availability of oxygen dissolved in the aqueous solution in the reinforcement region. Thus, the resistivity is recognized as a parameter directly related to the likelihood and extent of corrosion. In practice, the measurement of resistivity is associated with other structure evaluation techniques such as the measurement of electrochemical potential in the system concrete/reinforcement. In general, it is assumed that the corrosion is right and should have a high rate when the electrical resistivity of concrete is low and the potential of the measure indicates its depassivation. In this paper are presented the electrical resistivity measurement techniques of concrete and made considerations regarding the assessment of the risk of corrosion of the field structures

ARAUJO, Adriana de; PANOSSIAN, Zehbour; OLIVEIRA, Kleber Jesus de; PEREIRA FILHO, Mario Leite. Técnicas de medida da resistividade elétrica em estruturas atmosféricas de concreto convencional. Téchne, Ano 22, Ed. 210, p.44-48, set., 2014.

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