/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Structures, 36, pp. 147-155, 2003-04-01 A Coupled A.C. impedance -creep and shrinkage investigation of hardened cement paste Tamtsia, B. T.; Beaudoin, J. J.; Marchand, J. Materials and ABSTRACTThe effect of three pre-drying treatments (prior to re-saturation with synthetic pore fluid) on time dependent deformation was investigated.The pre-drying treaments comprised methanol and isopropanol exchange (followed by vacuum heating at 37°C) and vacuum drying at 37°C alone. Real-time changes in microstructure due to sustained load were followed through the coupling of an a.c. impedance frequency analyzer with a miniature loading system. Cement paste specimens were in the form of Tshaped columns with minimum thickness value around 1 mm. The impedance analysis included an assessment of the relevance of the high frequency arc depression angle to creep and shrinkage behavior of cement paste. RÉSUMÉ