Mössbauer and xrd analysis of corrosion products of carbonated alkali-activated slag reinforced concretes
Steel bars embedded in an alkali-activated slag (AAS) concrete have been exposed (after curing for 28 days) to an accelerated carbonation chamber (3 % CO2, 65 % relative humidity (RH), and 25 ºC temperature) and to a laboratory environment (0.03 % CO2, 65 %RH, and 25 ºC). Ordinary Portland cement (O...
- Autores:
-
Aperador Chaparro, William
Bautista Ruíz, Jorge Hernando
Vera López, Enrique
- Tipo de recurso:
- Article of journal
- Fecha de publicación:
- 2011
- Institución:
- Universidad Nacional de Colombia
- Repositorio:
- Universidad Nacional de Colombia
- Idioma:
- spa
- OAI Identifier:
- oai:repositorio.unal.edu.co:unal/40543
- Acceso en línea:
- https://repositorio.unal.edu.co/handle/unal/40543
http://bdigital.unal.edu.co/30640/
- Palabra clave:
- carbonation
corrosion
magnetite
wuestite
alkali-activated cement
Portland cement
steel reinforcement
- Rights
- openAccess
- License
- Atribución-NoComercial 4.0 Internacional
| Summary: | Steel bars embedded in an alkali-activated slag (AAS) concrete have been exposed (after curing for 28 days) to an accelerated carbonation chamber (3 % CO2, 65 % relative humidity (RH), and 25 ºC temperature) and to a laboratory environment (0.03 % CO2, 65 %RH, and 25 ºC). Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to identical experimental conditions.Corrosion products generated at the steel/concrete interface were characterized using Mössbauer spectrometry and the X-ray diffraction(XRD) technique. The main compounds were magnetite (Fe3O4), wuestite (FeO), and goethite (a-FeOOH). The morphology of corrosionproducts was analyzed using the scanning electron microscopy technique (SEM). |
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