Electrochemical cell design and impedance spectroscopy of cement hydration

Abstract

Understanding the complexity of the chemical and microstructural evolution of cement during hydration remains a controversial subject, and although numerous techniques have been used to assess this process, further insight is still needed. Alternating current impedance spectroscopy has been demonstrated to be a sensitive and powerful technique for cement characterisation in both fresh and hardened states; however, it has also shown certain experimental limitations (e.g. data interpretation, electrode, and parasitic effects) that prevent its wider acceptance. This study assesses electrochemical cell design and the impedance response during cement hydration. The results show that a significant decrease in the parasitic effects at high frequencies (caused mainly by leads and electrode effects) can be achieved through an optimal cell design and impedance measurements correction, enabling correlation of impedance measurements to particular aspects of the cement hydration process. However, due the limited solid phase microstructural development and the high conductivity of cement paste at low degrees of hydration, the parasitic effects could not be fully eliminated for fresh or early-age cement pastes.

Estimating Hardness of Cosmetic Cream Using Electro-Mechanical Impedance Sensing Technique

“…To overcome these limitations of destructive testing, various non-destructive tests have been proposed to evaluate the hardening of cementitious materials in the construction field [8][9][10][11][12][13][14][15][16][17][18][19]. Lee et al have proposed an electro-mechanical impedance (EMI) sensing technique using a piezoelectric sensor as a non-destructive test to evaluate the hardening of cementitious materials [20][21][22][23].…”

Influence of an over calcined calcium oxide-based shrinkage-compensating admixture on some properties of a self-compacting concrete

“…In addition to the EIS, electrochemical impedance spectroscopy, a non-destructive detection method, has attracted attention due to many possible applications. For example, in the field of civil engineering, electrochemical impedance spectroscopy has been used mainly to evaluate the corrosion behavior of reinforcements [32,33], concrete carburizing [34], and ion transformations in cementitious materials [35,36]. In addition, some researchers have also used this technique to study the drying behavior of cement [37,38].…”