Resumo

BARRIOS-FONTALVO, Modesto et al. Use of Cedrela odorata Linnaeus Exudate for Inhibiting Corrosion by Chlorides in Reinforced Concrete. Cienc. Ing. Neogranad. [online]. 2020, vol.30, n.2, pp.9-20.  Epub 09-Dez-2020. ISSN 0124-8170.  https://doi.org/10.18359/rcin.4423.

This paper evaluates the use of cedar tree exudate in chloride penetration and the probability of steel corrosion in reinforced concrete (RC), considering 0.3, 0.5, 0.7, and 0.9% exudate by cement weight in the mixture at water/cement (W/C) ratios of 0.55 and 0.60. Under these conditions, cylindrical specimens of 4 inches in diameter and 8 inches in height were constructed. The water-soluble chloride content of the extracted concrete powder was measured at 0.5, 1.0, and 2.0 cm depth according to ASTM C1218/C1218M, while the probability of corrosion was determined by measuring electric potentials with ASTM C876. A favorable incidence of 0.46% by weight of concrete was found when using 0.7% exudate at the w/c ratio of 0.55 at the closest depth to the steel, compared to the 0.55% target. The probability of steel corrosion is reduced to 10% with potentials higher than -0.2 V with more prolonged exposure to chlorides.

Palavras-chave : Cedar gummy extract; concrete; steel; penetration; chlorides; corrosion.

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