An AC impedance spectroscopy study of freezing phenomena in Wollastonite micro-fibre reinforced cement paste

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ConferenceRole of Concrete in Sustainable Development, Proceedings of the International Symposium: 03 September 2003, University of Dundee, Scotland
Pages379387; # of pages: 9
AbstractA.C. impedance spectroscopy (ACIS) methods were used in studies designed to further understanding of the mechanism of frost action occurring within neat Portland cement paste and cement paste reinforced with wollastonite micro-fibres. An impedance measuring system was coupled with thermomechanical instrumentation 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 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 this context the importance of a parameter associated with the depression of the high frequency arc in an impedance spectrum is discussed. The role of the wollastonite micro-fibre addition in enhancing the durability of cement paste to freezing-thawing is described.
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AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number46636
NPARC number20378937
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Record identifier79ca6cb1-0fee-49c9-8b0b-94eb87622fea
Record created2012-07-24
Record modified2016-05-09
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