An AC Impedance Spectroscopy Study of Freezing Phenomena in Wollastonite Micro-Fibre Reinforced Cement Paste

A.C. impedance spectroscopy (ACIS0 methods were used in studies designed to further understand the mechanism of frost action occurring with neat Portland cement paste and cement paste reinforced with wollastonite micro-fibers. An impedance measuring system was coupled with thermomechanical instrumentation in order to provide real-time impedance spectra and length change data simultaneously on the same specimen during a freezing and thawing cycle. Analysis of the ACIS data provided insight on the relationship between the behavior and mechanism of frost action within the paste systems that were studied. A mechanistic model (involving interfacial phenomena between liquid water - ice - C-S-H surfaces) based on interpretation of impedance spectra is put forward. In the context, the importance of a parameter associated with the depression of the high frequency are in an impedance spectrum is also discussed. The role of wollastonite micro-fiber addition in enhancing the durability of cement paste to freezing-thawing is also described in the paper.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 379-388
  • Monograph Title: Role of Concrete in Sustainable Development

Subject/Index Terms

Filing Info

  • Accession Number: 01010854
  • Record Type: Publication
  • ISBN: 0727732471
  • Files: TRIS
  • Created Date: Nov 28 2005 12:53PM