ISSN: 0149-6123
CODEN: CCAGPD
Page Count: 6

Determination of Silica-Fume Content in Hardened Concrete by AC Impedance Spectroscopy
Beaudoin, JJ
Institute for Research in Construction, Materials Laboratory, Ontario

Gu, P
Institute for Research in Construction, Materials Laboratory, Ontario

Xie, P
University of Ottawa, Ontario

Abstract

A nondestructive method based on AC impedance spectroscopy was applied to studies of the electrical behavior of hydrated portland cement concrete containing silica fume. Silica fume content significantly influenced the impedance behavior of hydrated portland cement concrete. Correlations between the high frequency arc (HFA) diameter and the silica-fume content in concrete were obtained. Empirical relationships for concrete binders at early and more advanced hydration can be expressed as DHFA=Koβsf+Cfor early hydration times and DHFA=C′(Ko′)βsffor advanced hydration times where DHFA is the high frequency arc diameter, β^sf is the silica-fume content, Ko, K′o, C, and C′ are constants related to hydration times and W-C ratio, and so forth.

Keywords:
concrete, portland cement, silica fume, AC impedance spectroscopy

Paper ID: CCA10343J
DOI: 10.1520/CCA10343J
ASTM International is a member of CrossRef.