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Nondestructive Monitoring Hydration of Belite Calcium Sulfoaluminate Cement by EIS Measurement

Journal Article (2022)
Author(s)

Lin Chi (University of Shanghai for Science and Technology)

Mian Wang (University of Shanghai for Science and Technology)

Zhuolin Wang (Shanghai Research Institute of Building Sciences)

Z. Li (TU Delft - Materials and Environment)

B. Peng (University of Shanghai for Science and Technology)

Junjie Li (University of Shanghai for Science and Technology)

Research Group
Materials and Environment
Copyright
© 2022 Lin Chi, Mian Wang, Zhuolin Wang, Z. Li, Bin Peng, Junjie Li
DOI related publication
https://doi.org/10.3390/ma15134433
More Info
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Publication Year
2022
Language
English
Copyright
© 2022 Lin Chi, Mian Wang, Zhuolin Wang, Z. Li, Bin Peng, Junjie Li
Research Group
Materials and Environment
Issue number
13
Volume number
15
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Abstract

In this study, the impact of water-to-cement (w/c) ratios of belite calcium sulfoaluminate cement (BCSA) on the hydration kinetics and the electrochemical impedance spectroscopy (EIS) parameters is studied. According to the analysis of classic hydration measurements, such as calorimetry tests, chemical shrinkage content, and chemically bound water content, it can be concluded that a higher w/c ratio clearly accelerates the hydration of BCSA cement paste. The electrical resistivity of BCSA0.35 cement paste is more than 4.5 times that of BCSA0.45 and BCSA0.5, due to the gradually densified micropore structure blocking the electrical signal transmission rather than the free charged-ion content. The porosity of BCSA0.5 is 27.5% higher than that of BCSA0.35 and 7.8% higher than that of BCSA0.45, which proves the resistivity is clearly related to the variation in microstructure, especially for the porosity and pore size distribution. The novelty of this study is the linear regression with logarithm terms of electrical resistivity and classic hydration parameters such as chemical shrinkage, cumulative hydration heat, and chemically bound water is established to extend the classical expression of cement hydration degree. It indicates that the electrochemical impedance spectroscopy can be taken as a nondestructive testing measurement to real-time monitor the cement hydration process of cement-based materials.