Interpretation of impedance spectroscopy of cement paste via computer modelling - Part I Bulk conductivity and offset resistance

R. T. Coverdale, B. J. Christensen, H. M. Jennings, T. O. Mason, D. P. Bentz, E. J. Garboczi

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Computer simulation of impedance spectroscopy (IS) of hydrating cement paste, using a three-dimensional, four-phase model, is described. Two puzzling features of experimental IS results, the possible offset resistance in the Nyquist plot and the sharp decrease in normalized conductivity within the first 50 h of reaction, have been studied using the computer simulation model. Insight is provided into these features using the ability of the model to compare quantitatively microstructure and properties. It is concluded that the offset resistance is an experimental artefact, and does not directly relate to microstructure. The drop in conductivity during the first 50 h is shown to be a consequence of a gradual shift from parallel-dominated to series-dominated behaviour of the electrical conductivity, as microstructural modifications take place during hydration, causing the capillary pore structure to become more tortuous. This tortuousity can also explain the high-frequency impedance behaviour in terms of a two-arc response.

Original languageEnglish
Pages (from-to)712-719
Number of pages8
JournalJournal of Materials Science
Volume30
Issue number3
DOIs
Publication statusPublished - Jan 1995

Fingerprint

cements
Ointments
Cements
Spectroscopy
impedance
conductivity
computerized simulation
spectroscopy
microstructure
Microstructure
Computer simulation
Pore structure
Hydration
hydration
artifacts
arcs
plots
porosity
electrical resistivity
shift

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)

Cite this

Interpretation of impedance spectroscopy of cement paste via computer modelling - Part I Bulk conductivity and offset resistance. / Coverdale, R. T.; Christensen, B. J.; Jennings, H. M.; Mason, T. O.; Bentz, D. P.; Garboczi, E. J.

In: Journal of Materials Science, Vol. 30, No. 3, 01.1995, p. 712-719.

Research output: Contribution to journalArticle

Coverdale, R. T. ; Christensen, B. J. ; Jennings, H. M. ; Mason, T. O. ; Bentz, D. P. ; Garboczi, E. J. / Interpretation of impedance spectroscopy of cement paste via computer modelling - Part I Bulk conductivity and offset resistance. In: Journal of Materials Science. 1995 ; Vol. 30, No. 3. pp. 712-719.
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