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Steel corrosion behaviour in carbonated alkali-activated slag concrete

Aperador, W. / Gutierrez, R.Mejia de / Bastidas, D.M.

Steel bars embedded in an alkali-activated slag (AAS) concrete were exposed (after curing for 28 days) to an accelerated carbonation test (3% CO2, 65% relative humidity (RH), and 25 deg C temperature) and a laboratory environment (0.03% CO2, 65% RH, and 25 deg C). Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to identical experimental conditions. The corrosion behaviour of uncarbonated and carbonated AAS and OPC concretes was tested for different times, performing corrosion potential, linear polarization resistance, and electrochemical impedance spectroscopy measurements. Corrosion products were analysed using the Mössbauer technique. The main corrosion products found were magnetite (Fe3O4), wüstite (FeO), and goethite (alpha-FeOOH).

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Steel corrosion behaviour in carbonated alkali-activated slag concrete

Aperador, W. / Gutierrez, R.Mejia de / Bastidas, D.M.

Steel bars embedded in an alkali-activated slag (AAS) concrete were exposed (after curing for 28 days) to an accelerated carbonation test (3% CO2, 65% relative humidity (RH), and 25 deg C temperature) and a laboratory environment (0.03% CO2, 65% RH, and 25 deg C). Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to identical experimental conditions. The corrosion behaviour of uncarbonated and carbonated AAS and OPC concretes was tested for different times, performing corrosion potential, linear polarization resistance, and electrochemical impedance spectroscopy measurements. Corrosion products were analysed using the Mössbauer technique. The main corrosion products found were magnetite (Fe3O4), wüstite (FeO), and goethite (alpha-FeOOH).

Steel corrosion behaviour in carbonated alkali-activated slag concrete

Aperador, W. / Gutierrez, R.Mejia de / Bastidas, D.M.

Steel bars embedded in an alkali-activated slag (AAS) concrete were exposed (after curing for 28 days) to an accelerated carbonation test (3% CO2, 65% relative humidity (RH), and 25 deg C temperature) and a laboratory environment (0.03% CO2, 65% RH, and 25 deg C). Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to identical experimental conditions. The corrosion behaviour of uncarbonated and carbonated AAS and OPC concretes was tested for different times, performing corrosion potential, linear polarization resistance, and electrochemical impedance spectroscopy measurements. Corrosion products were analysed using the Mössbauer technique. The main corrosion products found were magnetite (Fe3O4), wüstite (FeO), and goethite (alpha-FeOOH).

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Title:

Steel corrosion behaviour in carbonated alkali-activated slag concrete

Additional title:

Korrosionsverhalten von Stahl in carbonatisiertem und alkalisch-aktiviertem Schlackebeton

Contributors:

Aperador, W. (author) / Gutierrez, R.Mejia de (author) / Bastidas, D.M. (author)

Published in:

Corrosion Science ; 51 ; 2027-2033

Publication date:

2009

Size:

7 Seiten, 8 Bilder, 4 Tabellen, 27 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.corsci.2009.05.033

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Korrosion , Bewehrungsstahl , Zement , Alkali-Carbonat-Reaktion , alkalische Anregung , Kohlendioxid , Korrosionsprodukt , beschleunigte Prüfung , Laborversuch , Zeitdauer , Korrosionspotenzial , elektrochemische Impedanzspektrometrie , Mössbauer-Spektroskopie

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