Calcium Aluminate Cement (CAC) can be used successfully in mortars and concretes for special applications such as refractory and sulphate-resistant materials. However, some failures have been reported when used in reinforced concretes exposed to wet environments in presence of chloride ions. Chloroaluminates formation in either reinforced CAC mortar or concrete could be a way to reduce chloride ions in the pore solution of this material, thereby, decreasing the risk of corrosion. This paper presents the characteristic values of corrosion rate, corrosion potential and resistivity and the relationship between them. Assuming a significant corrosion state at corrosion rate values over 0.1 mu A/cm(2), we can establish a threshold level for corrosion initiation in reinforced mortar or concrete of -250 mV and 10(4) Omega.cm. Therefore, lesser values constitue important corrosion rates.