Interpretation of the Corrosion Rate Measurement of Carbonated Structures Using the Polarization Resistance Technique
Nelson E. Diaz, PCC/EPUSP, CRUSP, São Paulo, SP, Brasil
ABSTRACT The corrosion of the reinforcement is the main pathology for Brazilian concrete structures. Specifically, the corrosion by carbonation is one of the principal causes of deterioration for structures in non-marine environmental cities. In this paper are given some experiences acquired during inspection of structures corroded by carbonation in São Paulo city. In theses cases were used the Polarization Resistance (Rp) technique for corrosion rate (icorr) measurement. The magnitudes of the icorr founded were relatively low comparing with the icorr originated by chloride attack. Were noticed that measurement values have been found higher than the values reported in European literature. Also it is important to consider the exposure and environment conditions for choice the instance time of measurement. Finally, is suggested a sequence that should be follow during the inspections of the structures in tropical environmental conditions corroded by carbonation.
Publication Source: NDTISS '99 - International Symposium on NDT Contribution to the Infrastructure Safety Systems, Nov 1999 in Tores Brazil.
Publisher: Center of Tecnology, Federal University of Santa Maria (UFSM) - [Homepage]
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