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Reversible and Irreversible Electrically-Induced Shape Changes in Cement-Basedmaterials

Published online by Cambridge University Press:  21 February 2011

Jhe-Fang Li ,
Li-Jian Yuan  and
Dwight Viehland
Jhe-Fang Li
Affiliation:
Department of Materials Science and Engmeering and The Center for Advanced Cement Based Materials, University of Illinois, Urbana, IL 61801
Li-Jian Yuan
Affiliation:
Department of Materials Science and Engmeering and The Center for Advanced Cement Based Materials, University of Illinois, Urbana, IL 61801
Dwight Viehland
Affiliation:
Department of Materials Science and Engmeering and The Center for Advanced Cement Based Materials, University of Illinois, Urbana, IL 61801
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Abstract

The electromechanical behavior of hardened portland cement paste has been investigated as a function of measurement frequency and DC electrical bias using an inductance technique. Large field-induced shape changes on the order of 104 Å have been found in millimeter thick specimens exposed to moisture. Both reversible and irreversible contributions to the total electrically-induced strain were observed. In addition, strong hysteresis effects were found on cycling a large AC field. Dry samples were found to exhibit no field-induced deformations. The mechanism underlying this anomalous behavior is believed to be an electro-osmotically induced swelling of the gel-pore structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 370: Symposia Va/Vb – Microstructure of Cement-Based Systems/Bonding and Interfaces in Cement... , 1994 , 265
Copyright
Copyright © Materials Research Society 1995

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References

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