Non-Destructive Monitoring of Hydration Characteristics in Alternative Materials and Seawater-Based Cementitious Pastes Using Electrochemical Impedance Spectroscopy

Fangsheng Gao, Lei Cheng (), Jun Liu () and Jihua Zhu
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Fangsheng Gao: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Lei Cheng: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Jun Liu: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China
Jihua Zhu: College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China

Sustainability, 2024, vol. 16, issue 17, 1-13

Abstract: This study investigates the hydration behavior of cementitious materials incorporating fly ash, limestone and calcined clay (LC2), and seawater, aiming to understand the individual and synergistic effects of these components on hydration kinetics. The motivation behind this research lies in the growing interest in enhancing the performance and sustainability of cement-based materials by incorporating supplementary materials and utilizing seawater. To achieve this, the hydration process was meticulously examined using electrochemical impedance spectroscopy (EIS). An innovative equivalent circuit model was developed to analyze the results. The experimental data indicated that, with ongoing hydration, the diameter of the impedance arc in the high-frequency range gradually increases. A noteworthy observation is that increasing the proportion of fly ash and LC2 in the cement paste leads to a corresponding enlargement of the high-frequency arc, indicating a significant influence of these supplementary materials on the hydration process. Additionally, LC2 was found to be more effective in accelerating the hydration process compared to fly ash.

Keywords: fly ash; LC2; equivalent circuit model; hydration process; electrochemical impedance spectroscopy (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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