Non-destructive tracing on hydration feature of slag blended cement with electrochemical method

This paper aims to use electrochemical impedance spectroscopy (EIS) with a novel equivalent circuit (EC) model to examine the hydration behavior of cement materials that incorporate ground granulated blast furnace slag. The experimental results suggest that the electrochemical impedance behavior of blended cement materials vary depending on the slag content. Also, the resistance associated with the ion transport process increases gradually along with the hydration process, and decreases as the slag is incorporated into the cement. In addition, we describe the linear relationship between the Rct1 value and the compressive strength for different slag contents and curing ages. The proposed method of EIS for slag blended cement materials, and the reliability of the new equivalent circuit model, is investigated across the entire hydration process of slag blended cement materials. Finally, the correlation of the compressive strength and the Rct1 value of blended cement materials with different slag contents are analyzed.