The measurement of water transport in porous materials using impedance spectroscopy

Richard J Ball, G C Allen

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

This paper describes the application of electrical measurements to monitor the extraction (movement of water from the mortar) of water from calcium lime, natural hydraulic lime and Portland cement mortars placed on an adsorbent brick substrate. Impedance measurements were used to identify the changes in bulk resistance of the mortar. A model has been developed combining sharp front theory and Boltzmann's distribution law of statistical thermodynamics to identify the point at which no further absorption of water into the brick occurs. A linear relationship was found between the exponential of bulk resistance and the square root of time during dewatering. A change in gradient was attributed to the end of dewatering.
Original languageEnglish
Article number105503
Number of pages6
JournalJournal of Physics D: Applied Physics
Volume43
Issue number10
Early online date25 Feb 2010
DOIs
Publication statusPublished - 17 Mar 2010

Keywords

  • Statistical mechanics
  • Quantum theory
  • Calcium
  • Solvent extraction
  • Thermodynamics
  • Mortar
  • Portland cement
  • Dewatering
  • Brickmaking
  • Lime brick
  • Water absorption
  • Porous materials
  • Lime
  • Plaster
  • Adsorption

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