Abstract
The present study compared the response of rust-free and corroded steel electrodes in Ca(OH)2-saturated solutions and in cement mortar, essentially defined in terms of polarization resistance as measured with gravimetric, metallographic and electrochemical methods. Answers were sought for the following questions, which persist despite the use of reinforced concrete (RC) in building for over a century: At what corrosion rate is RC durability seriously compromised? Does restoration of the initial conditions in properly manufactured concrete guarantee repassivation of corroded steel? Does the use of inhibitors enhance repassivation? Does the nature of the corrosion products have any significant effect on the response of corroded steel reinforcement? The results obtained in indicated that the effectiveness of preventive methods is much more closely related to the degree of existing corrosion than to the nature of the corrosion products.
Highlights
La certeza de que la electroquímica de cloruros (EEC) y la realcalinización electroquímica (RAE) son capaces de eliminar, en pocas semanas, las causas de la corrosión de las estructuras de hormigón armado (EHA) (9-13)
The certainty that electrochemical chloride extraction (ECE) and electrochemical realkalization (ER) can eliminate the causes of reinforced concrete (RC) corrosion in a matter of weeks (9-13)
The above review of the state of the art failed to provide a satisfactory answer to the core question: “once the causes of corrosion are removed, can corrosion in corroded RC structures be arrested?”
Summary
ER and ECE have attracted particular interest for the substantially lower cost and greater respect for the environment and worker health afforded by these than conventional repair methods. Another important advantage is their short duration compared to the ongoing need for maintenance involved in cathode protection (CP). The underlying assumption is that rehabilitation procedures are generally instituted when signs of RC deterioration have already been detected, rather than as preventive methods. With that premise as a starting point, the aim is to ascertain to what extent the effectiveness of future preventive measures is conditioned by the nature or origin of the corrosion products, the existing degree of steel deterioration and the timing of corrective action
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