Resumo

ACOSTA-LOMELI, M.E. et al. Electrochemical Evaluation on Repairs with Mortars in Structures Affected by Chlorides Contamination . Port. Electrochim. Acta [online]. 2005, vol.23, n.3, pp.413-422. ISSN 0872-1904.

Inside the construction industry, in the area of sea water retention structures, the chlorides contamination is a main cause of the corrosion, because in the concrete they could form macro cells upon repairing and applying a mortar free of this ion, forming anodes in the repaired zones, and thus increasing corrosion. In the reinforcements are commonly formed corrosion products because the concrete is exposed to mechanical, physical, chemical or biological conditions that commit and shorten their performance. As a consequence, it is important to determine their useful life and that of the made repairs, using electrochemical techniques that allow determining the level of protection, the effect of the macro cells in the corrosive process of the reinforcement, and the mechanism of deterioration in the structures. The present work was carried out using six beams with preoxided reinforcements, six precracking and one beam blank. After curing, those beams were exposed to accelerated cycles of deterioration for causing the cracking of the concrete, making possible to observe their electrochemical behaviour. The tests carried out were corrosion potential and corrosion rate, through the resistance to the polarization technique.

Palavras-chave : corrosion; chlorides; macro cells; electrochemistry; concrete.

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