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Comportamiento del acero precorroído en solución saturada de Ca(OH)2 y en mortero de cemento. Posibilidades de rehabilitación

Authors: Miranda, J. M.; Otero, Eduardo; González, J. A.; Hernández, L. S.;

Comportamiento del acero precorroído en solución saturada de Ca(OH)2 y en mortero de cemento. Posibilidades de rehabilitación

Abstract

[ES] En el presente trabajo se analizan las respuestas de electrodos de acero, limpios y precorroídos, en soluciones saturadas de Ca(OH)2 y en mortero de cemento, recurriendo para ello a técnicas gravimétricas, metalográficas y electroquímicas, esencialmente a medidas de resistencia de polarización. Se intenta encontrar respuesta a las siguientes dudas persistentes después de más de un siglo de utilización de las estructuras de hormigón armado (EHA): ¿qué velocidades de corrosión comprometen seriamente la durabilidad de las EHA? ¿La restauración de las condiciones iniciales de un hormigón correctamente fabricado garantiza la recuperación del estado pasivo en los refuerzos ya corroídos? ¿La utilización de inhibidores facilita la repasivación de los refuerzos? ¿Cambia la naturaleza de los productos de corrosión sustancialmente la respuesta de las armaduras ya corroídas? Los resultados obtenidos indican que la eficacia de las medidas preventivas resulta mucho más condicionada por el grado de corrosión ya exhibido por los refuerzos que por la naturaleza de los productos de corrosión.

[EN] 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.

12 páginas, 8 figuras.

Peer reviewed

Keywords

Corrosion, Repassivation, Corrosión, Técnicas electroquímicas, Steel, Repasivación, Acero, Mortero de cemento, Electrochemical techniques, Cement mortar

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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