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The Effect of Ca(OH)2-Treated Ceramic Microspheres on the Mechanical Properties of High-Temperature Lightweight Cement Compos

Published online by Cambridge University Press:  21 February 2011

Toshifumi Sugama
Toshifumi Sugama*
Affiliation:
Process Sciences Division, Department of Applied Science, Brookhaven National Laboratory, Upton, New York 11973, U.S.A.
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Abstract

The compressive strength and water permeability of high-temperature lightweight cementing materials containing sillimanite-based hollow microspheres as a filler can be improved by treating the surfaces of the microspheres with a Ca(OH)2-saturated solution at temperatures up to 200°C. The precipitation of an epitaxial layer formed by an interaction between a hot calcium hydroxide solution and the surface of the sphere plays an essential role in developing favorable bonding characteristics at the interfaces and in promoting the hydration of the cement matrix. The properties of the composites include a slurry density of <1.2 g/cc at 25°C, a 300°C-24 hour compressive strength of >1015 psi (7.0 MPa), a water permeability of <10-4 Darcy, and a bulk density of <1.0 g/cc. It was observed that tobermoritetruscottite transformation and anorthite formation during autoclave exposure for 180 days in brine at 300°C results in slight strength reductions and increased water permeability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 114: Symposium R – Bonding in Cementitious Composites , 1987 , 301
Copyright
Copyright © Materials Research Society 1988

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References

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