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基于电化学阻抗谱测量的贝利特硫铝酸钙水泥水化无损监测

Nondestructive Monitoring Hydration of Belite Calcium Sulfoaluminate Cement by EIS Measurement.

作者信息

Chi Lin, Wang Mian, Wang Zhuolin, Li Zhenming, Peng Bin, Li Junjie

机构信息

School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.

Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences Co., Ltd., Shanghai 200032, China.

出版信息

Materials (Basel). 2022 Jun 23;15(13):4433. doi: 10.3390/ma15134433.

DOI:10.3390/ma15134433
PMID:35806557
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9267883/
Abstract

In this study, the impact of water-to-cement (/) 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 / 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.

摘要

本研究考察了贝利特硫铝酸钙水泥（BCSA）的水灰比（/）对水化动力学及电化学阻抗谱（EIS）参数的影响。通过对量热试验、化学收缩量及化学结合水量等经典水化测量结果的分析可知，较高的/比能显著加速BCSA水泥净浆的水化。BCSA0.35水泥净浆的电阻率是BCSA0.45和BCSA0.5水泥净浆的4.5倍多，这是由于微孔结构逐渐致密，阻碍了电信号传输，而非自由带电离子含量的影响。BCSA0.5的孔隙率比BCSA0.35高27.5%，比BCSA0.45高7.8%，这证明了电阻率与微观结构的变化密切相关，尤其是孔隙率和孔径分布。本研究的新颖之处在于建立了电阻率与化学收缩、累积水化热和化学结合水等经典水化参数的对数项线性回归方程，以扩展水泥水化程度的经典表达式。这表明电化学阻抗谱可作为一种无损检测手段，用于实时监测水泥基材料的水泥水化过程。

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