Corrosion Process of Reinforced Concrete by Carbonation in a Natural Environment and an Accelerated Test Chamber

摘要

Electrochemical impedance spectroscopy (EIS) was used to monitor carbonation front progress inplain and reinforced concrete beams in a tropical marine environment and an accelerated carbonationchamber. Manufacturing and exposure conditions notably affected the carbonation phenomenon.Passivity conditions, passive-active transition and activation of the concrete-steel interface wereestimated. The EIS detected differential responses during the exposure time course caused by changesin environmental relative humidity. Relative humidity exercises an ohmic control that has a greaterinfluence on the corrosion process than does carbonation of the concrete paste at the reinforcementlevel.