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Journal of Materials Science

, Volume 26, Issue 2, pp 349–353 | Cite as

Impedance spectra of hydrating cement pastes

  • C. A. Scuderi
  • T. O. Mason
  • H. M. Jennings
Papers

Abstract

Complex impedance spectra were obtained over the frequency range 5 Hz to 13 MHz on Portland cement pastes with water/cement ratios of 0.3, 0.35, and 0.4 at various hydration times from 6 h to 24 days. Features of the spectra which could be associated with the bulk material and which could be separated from the electrode arc, were studied. The overall bulk resistance of each paste was thereby determined as a function of hydration time. Bulk features evolved from a simple high-frequency intercept to an intercept with a single arc, then an intercept with two overlapping arcs, and back to an intercept with a single arc. A plausible equivalent circuit was developed involving an electrodeR/C network and constant phase element in series with one or two bulkR/C networks and a bulk resistor. Possible physical interpretation is discussed but assignment of equivalent circuit elements to microstructural features and/or processes will require microstructural characterization and a knowledge of pore-phase chemistry and properties.

Keywords

Equivalent Circuit Portland Cement Microstructural Feature Physical Interpretation Impedance Spectrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman and Hall Ltd 1991

Authors and Affiliations

  • C. A. Scuderi
    • 1
    • 3
  • T. O. Mason
    • 1
    • 3
  • H. M. Jennings
    • 1
    • 3
    • 2
  1. 1.Materials Science and EngineeringNorthwestern UniversityUSA
  2. 2.Civil EngineeringNorthwestern UniversityUSA
  3. 3.The McCormick School of Engineering and Applied ScienceScience and Technology Center for Advanced Cement-Based MaterialsEvanstonUSA

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