The Early-age short-term creep of hardening cement paste: AC impedance modeling

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DOIResolve DOI: http://doi.org/10.1023/A:1023769323629
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Materials Science
Volume38
IssueMay 15 10
Pages22472257; # of pages: 11
Subjectcement paste, a.c. impedance spectra; Concrete
AbstractImpedance spectra were monitored at early ages on hydrating Portland cement pastes subjected to a sustained load. The pastes were prepared with two different water-cement ratios (0.35 and 0.50). The experiments were conducted in a controlled chamber maintained at (96 ± 2)% relative humidity. The three ages at loading investigated were 18, 24 and 30 hours. Real-time changes in paste microstructure due to sustained load were followed through the coupling of an AC impedance frequency analyzer with a miniature loading system. Cement paste specimens were in the form of ?T-shaped? columns with a minimum thickness value (for the web and flanges) less than 1.25 mm. The impedance analysis included an assessment of the relevance of the high frequency arc depression angle to an understanding of the creep and shrinkage behavior of cement paste. Electrical models were developed in order to predict the creep coefficient of normal (w/c=0.50) and high strength (w/c=0.35) cement pastes from early age data.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number45702
14971
NPARC number20386436
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Record identifier6e00a3c8-fc4c-4a62-a413-3e9d953da63d
Record created2012-07-25
Record modified2016-05-09
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