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Thermal Properties of Fly Ash-Slag Cement Waste forms for Disposal of Savannah River Plant Salt Waste

Published online by Cambridge University Press:  25 February 2011

S. Kaushal ,
D. M. Roy ,
P. H. Licastro  and
C. A. Langton
S. Kaushal
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
D. M. Roy
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802 Also Affiliated with the Department of Materials Science and Engineering
P. H. Licastro
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
C. A. Langton
Affiliation:
E.I. duPont de Nemours, Savannah River Laboratory, Aiken, SC 29808
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Abstract

Waste processing at the Savannah River Plant will involve reconstitution of the salts (NaNO3, NaNO2, Na2 SO4 and NaOH) into a concentrated solution followed by solidification in a cement-based waste form. Phase stability and mechanical durability of this material will depend to a considerable extent on the thermal properties of the waste form. Fly ash has been used to moderate the hydration and setting processes so as to avoid high temperatures which could cause thermal stresses. Both high-calcium (Class C) and low-calcium (Class F) fly ashes were studied. Other constituents of the mixes include granulated blast furnace slag and finely crushed lime-stone. The adiabatic temperature increases and thermal conductivities were measured and related to matrix mineralogy and microstructure as determined by x-ray diffraction and scanning electron microscopy, respectively.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 65: Symposium T – Fly Ash and Coal Conversion By-Products II , 1985 , 311
Copyright
Copyright © Materials Research Society 1986

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References

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