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Monitoring hydration of Sr-doped calcium zirconium aluminate (Ca,Sr)7ZrAl6O18 cement via electrochemical impedance spectroscopy (EIS) and supported techniques
https://orcid.org/0000-0002-5418-1973
Highlights The effect of Sr2+ doping on EIS of Ca7ZrAl6O18 cement paste is studied. Changes in phase composition and microstructure of hydrating cement systems affect the EIS response in Nyquist format. Suitable electrochemical equivalent models were applied to fit the measured EIS data of samples.
Abstract The approach to equivalent circuit modelling of reference Ca7ZrAl6O18 and (Ca,Sr)7ZrAl6O18 cement pastes has been to interpret spectra obtained from impedance measurements, assigning electrical responses to the hydration features such as hydration products and microstructure. The early and long-term hydration behaviour of new cements was also traced by means of X-ray diffraction (XRD), simultaneous thermal analysis (DSC-TG-EGA-MS), scanning electron microscopy (SEM-EDS) and Raman microspectroscopy chemical mapping as supported techniques. In the structurally modified cement, (Ca,Sr)7ZrAl6O18 does not react as violently and immediately with water as Ca7ZrAl6O18 in a pure form. The overall bulk resistance of the Ca7ZrAl6O18-based cement paste significantly outweighs the value of (Ca,Sr)7ZrAl6O18-based cement paste. As well, the poor crystallization degree of hydration products at the early-age provides the particular EIS responses in Nyquist format for hydrating cements. The electrochemical behavior of hydrating cement pastes varied both with time and after strontium doping leading us to various equivalent circuit models used for fitting the EIS results.
Monitoring hydration of Sr-doped calcium zirconium aluminate (Ca,Sr)7ZrAl6O18 cement via electrochemical impedance spectroscopy (EIS) and supported techniques
https://orcid.org/0000-0002-5418-1973
Highlights The effect of Sr2+ doping on EIS of Ca7ZrAl6O18 cement paste is studied. Changes in phase composition and microstructure of hydrating cement systems affect the EIS response in Nyquist format. Suitable electrochemical equivalent models were applied to fit the measured EIS data of samples.
Abstract The approach to equivalent circuit modelling of reference Ca7ZrAl6O18 and (Ca,Sr)7ZrAl6O18 cement pastes has been to interpret spectra obtained from impedance measurements, assigning electrical responses to the hydration features such as hydration products and microstructure. The early and long-term hydration behaviour of new cements was also traced by means of X-ray diffraction (XRD), simultaneous thermal analysis (DSC-TG-EGA-MS), scanning electron microscopy (SEM-EDS) and Raman microspectroscopy chemical mapping as supported techniques. In the structurally modified cement, (Ca,Sr)7ZrAl6O18 does not react as violently and immediately with water as Ca7ZrAl6O18 in a pure form. The overall bulk resistance of the Ca7ZrAl6O18-based cement paste significantly outweighs the value of (Ca,Sr)7ZrAl6O18-based cement paste. As well, the poor crystallization degree of hydration products at the early-age provides the particular EIS responses in Nyquist format for hydrating cements. The electrochemical behavior of hydrating cement pastes varied both with time and after strontium doping leading us to various equivalent circuit models used for fitting the EIS results.
Monitoring hydration of Sr-doped calcium zirconium aluminate (Ca,Sr)7ZrAl6O18 cement via electrochemical impedance spectroscopy (EIS) and supported techniques
https://orcid.org/0000-0002-5418-1973
Highlights The effect of Sr2+ doping on EIS of Ca7ZrAl6O18 cement paste is studied. Changes in phase composition and microstructure of hydrating cement systems affect the EIS response in Nyquist format. Suitable electrochemical equivalent models were applied to fit the measured EIS data of samples.
Abstract The approach to equivalent circuit modelling of reference Ca7ZrAl6O18 and (Ca,Sr)7ZrAl6O18 cement pastes has been to interpret spectra obtained from impedance measurements, assigning electrical responses to the hydration features such as hydration products and microstructure. The early and long-term hydration behaviour of new cements was also traced by means of X-ray diffraction (XRD), simultaneous thermal analysis (DSC-TG-EGA-MS), scanning electron microscopy (SEM-EDS) and Raman microspectroscopy chemical mapping as supported techniques. In the structurally modified cement, (Ca,Sr)7ZrAl6O18 does not react as violently and immediately with water as Ca7ZrAl6O18 in a pure form. The overall bulk resistance of the Ca7ZrAl6O18-based cement paste significantly outweighs the value of (Ca,Sr)7ZrAl6O18-based cement paste. As well, the poor crystallization degree of hydration products at the early-age provides the particular EIS responses in Nyquist format for hydrating cements. The electrochemical behavior of hydrating cement pastes varied both with time and after strontium doping leading us to various equivalent circuit models used for fitting the EIS results.
Monitoring hydration of Sr-doped calcium zirconium aluminate (Ca,Sr)7ZrAl6O18 cement via electrochemical impedance spectroscopy (EIS) and supported techniques
Madej, Dominika (author) / Kruk, Andrzej (author)
Construction and Building Materials ; 206 ; 307-320
2019-02-12
14 pages
Article (Journal)
Electronic Resource
English
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