Electrochemical Study of Clean and Pre-Corroded Reinforcements Embedded in Mortar Samples with Variable Amounts of Chloride Ions

Materials

Alfonso Cobo¹  María Isabel Prieto¹  María de las Nieves González¹  Fernando Israel Olmedo² 

[1] Escuela Técnica Superior de Edificación, Universidad Politécnica de Madrid, Avda. Ramiro de Maeztu, 7, 28040 Madrid, Spain;Valladares Ingeniería S.L, C/Julián Camarillo, 42, 28037 Madrid, Spain;

关键词: repassivation;    corrosion;    reinforcement;    electrochemical techniques;   

DOI  :  10.3390/ma14226883

来源: DOAJ

【 摘 要 】

The present study investigates the possibility of re-surfacing previously corroded reinforcements and the suitability of the two electrochemical techniques that are widely used to determine the state of corrosion of steel (the corrosion potential E_corr and the corrosion rate i_corr). In order to test this, 32 pre-corroded B500SD reinforcing steel bars have been used for one year, where half of the bars have been cleaned to eliminate corrosion products. The other half have been maintained with the generated corrosion products. Subsequently, the bars have been embedded in cement mortar samples with variable amounts of chloride ion, and E_corr and i_corr have been measured for 250 days. The results showed that it is not possible to rework the reinforcement without removing corrosion products and that it is not possible to predict the passive or active state of steel by measuring E_corr only.

【 授权许可】

Unknown