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Microstructural Aspects of Zeolite Formation in Alkali Activated Cements Containing High Levels of Fly Ash

Published online by Cambridge University Press:  21 February 2011

A.R. Brough ,
A. Katz ,
T. Bakharev ,
G-.K. Sun ,
R.J. Kirkpatrick ,
L.J. Struble  and
J.F. Young
A.R. Brough
Affiliation:
Center for Advanced Cement Based Materials, University of Illinois at Urbana-Champaign, Ceramics Building, 105 S. Goodwin Ave., Urbana, IL 61801, USA
A. Katz
Affiliation:
Center for Advanced Cement Based Materials, University of Illinois at Urbana-Champaign, Ceramics Building, 105 S. Goodwin Ave., Urbana, IL 61801, USA
T. Bakharev
Affiliation:
Center for Advanced Cement Based Materials, University of Illinois at Urbana-Champaign, Ceramics Building, 105 S. Goodwin Ave., Urbana, IL 61801, USA
G-.K. Sun
Affiliation:
Center for Advanced Cement Based Materials, University of Illinois at Urbana-Champaign, Ceramics Building, 105 S. Goodwin Ave., Urbana, IL 61801, USA
R.J. Kirkpatrick
Affiliation:
Center for Advanced Cement Based Materials, University of Illinois at Urbana-Champaign, Ceramics Building, 105 S. Goodwin Ave., Urbana, IL 61801, USA
L.J. Struble
Affiliation:
Center for Advanced Cement Based Materials, University of Illinois at Urbana-Champaign, Ceramics Building, 105 S. Goodwin Ave., Urbana, IL 61801, USA
J.F. Young
Affiliation:
Center for Advanced Cement Based Materials, University of Illinois at Urbana-Champaign, Ceramics Building, 105 S. Goodwin Ave., Urbana, IL 61801, USA
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Abstract

Wasteforms made by reaction at elevated temperature of a highly alkaline simulated low-level nuclear waste solution, having high sodium ion concentration, with a cementitious blend high in fly ash have been studied. Significant formation of Na-P1 zeolite (gismondine framework) and of a sodalite occurred. The time evolution of the crystalline phases over the first 28 days is reported for both adiabatic and isothermal curing, and the role of these phases in microstructure development is discussed. The level of carbonate ions in solution was found to have a substantial effect on strength evolution and chemistry.

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 , 197
Copyright
Copyright © Materials Research Society 1995

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