Funct. Mater. 2021; 28 1: 114-120.

doi:https://doi.org/10.15407/fm28.01.114

Analysis of impedance spectrum parameters in hydration process of concrete with composite admixtures

Fengjiao Jiang1, Gongzhi Yu2, Ce Liang1, Xiang Li1, Nan He1

1College of Information Engineering, Dalian Ocean University, Dalian, China
2Innovation and Entrepreneurship College, Dalian Ocean University, Dalian, China

Abstract: 

The electrochemical impedance spectroscopy method was applied to analyze the influence of mineral admixtures mixed with fly ash and slag on electrochemical impedance parameters during concrete hydration, and the characteristics of electrochemical impedance spectroscopy from early hydration and late hydration. The changes in the concrete structure were discussed. The results show that the concrete has the same change trend under different dosages of fly ash and slag admixture. In the early stages of hydration, as the minerals increased, the impedance parameters of the concrete decreased and the total porosity increased. The content of the mixture incorporated into the concrete and the concrete structure are loose. In the later stage of hydration, the impedance parameters are gradually increased. The secondary hydration effect and effect are more significant with the increase of mineral admixture content, that is, the more the mineral admixture is used in concrete, the more significant effect is.

Keywords: 
high performance concrete, hydration process, electrochemical impedance spectroscopy.

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