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Microstructural characterization of the transition zone in cement systems by means of A.C. impedance spectroscopy

✍ Scribed by Ping Gu; Ping Xie; J.J. Beaudoin

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
941 KB
Volume
23
Category
Article
ISSN
0008-8846

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✦ Synopsis

The microstructure of the transition zone between aggregate and cement paste, and the effect of silica fume, slag, fly ash and latex (EVA) aggregate coatings were investigated by means of A.C. impedance measurements. It has been demonstrated experimentally that the A.C. impedance technique has the potential to describe microstructural changes of the cement-aggregate transition zone induced by surface modification of aggregate. Coatings of pozzolanic materials such as silica fume, slag, fly ash can increase the density of the transition zone. Latex coatings (eg. EVA) actually make the deposition of hydration products on the aggregate surfaces more difficult and give rise to a more porous cement-aggregate interracial zone.

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