Resumo

BALTAZAR, M.A. et al. Corrosion Rate Evaluation on Steel in Concrete Exposed to Sulfate Solutions. Port. Electrochim. Acta [online]. 2004, vol.22, n.4, pp.335-344. ISSN 0872-1904.

The present work shows the results of the electrochemical evaluation of reinforced concrete specimens exposed in 3 to 5% Na₂SO₄ solutions during four months exhibition. The concrete was elaborated with water/cement ratio (w/c) of 0.4, 0.5 and 0.6. The electrochemical evaluation was carried out using the lineal resistance polarization technique. The results of these tests show that the biggest attack for Na₂SO₄ was presented in the specimens of 0.5 and 0.6 w/c ratio. Also, they showed a passive tendency after curing. On the other hand the Rp curves analysis, shows that in all the evaluated specimens a great corrosion rate was presented during the curing stage and after some time the system tends to be stabilized approximately in 0.05 mm/yr.

Palavras-chave : concrete; w/c ratio; lineal polarization resistance; corrosion rate.

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