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Changes Induced by PVA in the Cement Microstructure Surrounding Aggregate

Published online by Cambridge University Press:  21 February 2011

Un-Jen Chu ,
Jae-Ho Kim ,
Cheol Park  and
Richard E. Robertson
Un-Jen Chu
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
Jae-Ho Kim
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
Cheol Park
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
Richard E. Robertson
Affiliation:
Department of Materials Science and Engineering and Macromolecular Science and Engineering Center, The University of Michigan, 2300 Hayward St, Ann Arbor, MI 48109-2136
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Abstract

The presence of poly(vinyl alcohol) (PVA) in portland cement during its hydration was found to induce changes in the microstructure and behavior of the paste that forms around aggregate. The microstructure was studied with scanning electron microscopy in secondary electron, backscattered electron, and EDX mapping modes and with Fourier-transform infraredspectroscopy. The adhesion between cement paste and aggregate was examined with planar aggregate surfaces. With concentrations of the order of 1% by weight of PVA based onthe weight of the cement, the deposition of calcium hydroxide on the aggregate surface was found to be diminished and the porous layer that usually surrounds the aggregate to be reduced in thickness. Also, the bond between the aggregate and cement paste was increasedenough for the bond to approach the strength of the cement.

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 , 347
Copyright
Copyright © Materials Research Society 1995

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