Cast-Concrete Products Made with FBC Ash and Wet-Collected Coal-Ash
Publication: Journal of Materials in Civil Engineering
Volume 17, Issue 6
Abstract
Cast-concrete hollow blocks, solid blocks, and paving stones were produced at a manufacturing plant by replacing up to 45% (by mass) of portland cement with fluidized bed combustion (FBC) coal ash and up to 9% of natural aggregates with wet-collected, low-lime, coarse coal-ash (WA). Cast-concrete product specimens of all three types exceeded the compressive strength requirements of ASTM from early ages, with the exception of one paving-stone mixture, which fell short of the requirement by less than 10%. The cast-concrete products made by replacing up to 40% of cement with FBC ash were equivalent in strength (89–113% of control) to the products without ash. The abrasion resistance of paving stones was equivalent for up to 34% FBC ash content. Partial replacement of aggregates with WA decreased strength of the products. The resistance of hollow blocks and paving stones to freezing and thawing decreased appreciably with increasing ash contents. The cast-concrete products could be used indoors in regions where freezing and thawing is a concern, and outdoors in a moderate climate.
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Acknowledgments
The writers express their deep gratitude for the grants made possible by the Illinois Department of Commerce and Community Affairs through the Office of Coal Development and Marketing and the Illinois Clean Coal Institute. The UWM Center for By-Products Utilization was established in 1988 with a generous grant from Dairyland Power Cooperative, Lacrosse, Wis.; Madison Gas and Electric Company, Madison, Wis.; National Minerals Corporation, St. Paul, Minn.; Northern States Power Company, Eau Claire, Wis.; We Energies, Milwaukee; Wisconsin Power and Light Company, Madison, Wis.; and Wisconsin Public Service Corporation, Green Bay, Wis. Their financial support and additional grants and support from Manitowoc Public Utilities, Manitowoc, Wis., are gratefully acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 17 • Issue 6 • December 2005
Pages: 659 - 663
Copyright
© 2005 ASCE.
History
Received: May 25, 2004
Accepted: Sep 13, 2004
Published online: Dec 1, 2005
Published in print: Dec 2005
Notes
Note. Associate Editor: Nemkumar Banthia
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