In the present work using mortar samples of slag activated with alkaline solution (AAS) to which chloride induces a corrosive process by entering the chloride ion. After that cathode protection was applied to steel bars and then applied cathodic protection on steel bars ASTM A706 seismic resistant earthquake resistant embedded in the mortar with and without process of carbonization. For comparative purposes, ordinary Portland cement mortars were used (OPC) and exposed to the same experimental conditions.By means of the design through the numeric method based on finite elements (FEM) and the method of finite difference (FDM) applied to the cathodic protection and the electrochemical system, consists consisting of a simple geometry using the finite difference method (FDM), the influence of the conductivity was investigated on the cathodic protection in the of AAS mortars AAS. The study shows as a result was investigated, obtaining that the carbonation process has a positive influence in the conductivity favoring the cathodic protection.