عنوان مقاله [English]
Recently, the electrochemical impedance spectrometry (EIS) has been found as a key method in the field of materials science and electrochemistry for determination of electrical behavior of concrete and especially the interfacial zone of steel-concrete layer. In this paper, EIS of reinforced concretes made with binary and ternary combination of zeolite and copper slag as supplementary cementitious material were examined in an experimental research. Moreover, equivalent electrical circuits fitted for evaluation of steel/concrete interface of such concretes. The results showed that zeolite and copper slag enhanced the durability properties of concrete including the water and chloride permeability indexes. Also, with aid of electrical models and determining the polarization resistance with stern- geary equation, it was found that these martials increased the polarization resistance leading to the decrease of corrosion rate up to 65%.
Keywords: Natural zeolite, copper slag, electrochemical behavior, equivalent circuit, concrete durability