22 4Influence of Environmental and Electrochemical Factors in the Durability of ConcreteCorrosion Rate Evaluation of the Copper Cable Used in Grounding Systems at the ICE - Costa Rica 
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Portugaliae Electrochimica Acta

 ISSN 0872-1904

BALTAZAR, M.A. et al. Corrosion Rate Evaluation on Steel in Concrete Exposed to Sulfate Solutions. []. , 22, 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.

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

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