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: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2011 |
| País: | Colombia |
| Institución: | Universidad Nacional de Colombia |
| Repositorio: | Repositorio UN |
| Idioma: | español |
| 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/ |
| Access Level: | acceso abierto |
| Palabra clave: | carbonation corrosion magnetite wuestite alkali-activated cement Portland cement steel reinforcement |
| Sumario: | 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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