Corrosion of reinforcing bars embedded in alkali-activated slag concrete subjected to chloride attack
AUTOR(ES)
Chaparro, William Aperador, Ruiz, Jorge Hernando Bautista, Gómez, Robinson de Jesús Torres
FONTE
Materials Research
DATA DE PUBLICAÇÃO
13/12/2011
RESUMO
Steel bar embedded in an alkali-activated slag (AAS) concrete was tested under complete immersion, in 3.5% NaCl solution by weight of the slag. Ordinary Portland cement (OPC) was also tested for comparative purposes and exposed to the same solution. Monitoring of open-circuit potential, polarization resistance measurement and electrochemical impedance spectroscopy (EIS) were used to evaluate the corrosion behavior of steel bar. The corrosion resistances of AAS and OPC concretes were performed at 0, 3, 6, 9 and 12 months. Electrochemical measurements shows that AAS concrete presents passive corrosion behavior the first 3 months, after this period of time, it presents corrosion resistance decreased due to the chlorides presence at the steel/AAS interface. For 0 months immersion (28 days of curing) the AAS and OPC concretes presented a 10% of corrosion probability. After 3 months of immersion the tested AAS and OPC concretes showed similar behavior, the active potentials in the range from "0.2 to "0.6 V vs. Cu/CuSO4, indicate a 90% probability of corrosion.
Documentos Relacionados
- Characterization of sugarcane bagasse ash (SBA) and its evaluation for use in alkali-activated slag mixtures
- Estudo da retração em argamassa com cimento de escória ativada.
- A study on the compressive strength and microstructure characteristic of alkali-activated metakaolin cement
- Physical-mechanical behavior of alkali-activated materials produced by the one-part method based on fly ash and rice husk ash
- Experimental Investigation of Steel-Concrete Bond for Thin Reinforcing Bars