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It is necessary to improve transport properties of concrete for lengthening the durability of concrete, therefore it is very important to measure the pore structure of hardened cement paste precisely in understanding mass transport properties. Measurement in electric conductivity by the AC impedance method is suggested as simple and easy technique to understand it, and the usefulness is reported in the case of hardened cement paste used with ordinary Portland cement. However, this technique has not been applied for hardened cement paste mixed with fly ash and blast furnace slag that has very high resistance to chloride ingress. In this study, chloride ingress and microstructure of the fly ash cement paste (FAC) and blast furnace slag cement paste (BFSC) was investigated by the electric conductivity measurement. For measuring the electric conductivity the AC impedance method was applied, and backscattered electron image analysis and mercury intrusion method was used for measuring pore structure in FAC and BFSC. The relationship between porosity and the electric conductivity was expressed by the Archie’s law that is expressed with exponential function, and very high correlation was shown in chloride diffusion coefficient and electric conductivity regardless of fly ash and blast furnace slag replacement ratio.

Effect of Supplemental Cementitious Materials on Electric Conductivity and Chloride Ingress of Hardened Cement Paste