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TECHNICAL PAPERS

Study of Hydration During Curing of Residues From Coal Combustion With Limestone Addition

[+] Author and Article Information
E. J. Anthony

CANMET, Natural Resources Canada, 580 Booth Street, Ottawa, Ontario, K1A OE4 Canada

A. P. Iribarne, J. V. Iribarne

University of Toronto, Toronto, Ontario, M5S 1A7 Canada

J. Energy Resour. Technol 119(2), 89-95 (Jun 01, 1997) (7 pages) doi:10.1115/1.2794981 History: Received April 11, 1995; Revised February 07, 1997; Online November 06, 2007

Abstract

The hydration reactions that occur with CFBC materials treated via the CERCHAR hydration process and combined with PFA have been examined and compared with materials produced via the LIFAC (limestone injection into the furnace and activation of unreacted calcium) process. A wide range of chemical and physical techniques have been used to differentiate the actual speciation of cubes treated for up to 150 days. The two materials behave very differently, with FBC-derived ashes being dominated by sulphate chemistry, i.e., the formation of gypsum and ettringite. The CERCHAR-treated ashes appear to “make” portlandite available for “sulpho-pozzolanic” reactions, and this seems to be the key to understanding why these materials display superior performance in applications with PFA or cement substitution. The LIFAC materials, with much less sulphate and Fe2 O3 and more Al2 O3 , still produces ettringite, but no gypsum, and hydrated tetracalcium aluminate appears as the major hydration product.

Copyright © 1997 by The American Society of Mechanical Engineers
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