Activations and Properties of Cementitious Materials Made with Cement-Kiln Dust and Class F Fly Ash
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 1
Abstract
Activation methods and their effects on strength development of nonclinker cements made with 50% cement kiln dust (CKD) and 50% Class F fly ash (FA) were investigated. These activation methods included (1) ball mill cogrinding; (2) chemical (2 and 5% ) addition; and (3) elevated temperature curing (38 and ). Particle size distribution, hydration products, and compressive strength of the CKD-FA binders were studied. Soluble alkali and chloride content as well as pH value of the CKD-FA pastes were evaluated. The results indicate that all activation methods improved binder strength development. The strength improvement was more significant at the early age than that at the later age. Curing at elevated temperature appeared to be the most effective activation methods compared with grinding and addition. Combined activation methods provided the binder with higher activation effectiveness than any single activation method. The CKD-FA pastes had much higher alkali and chloride contents but slightly lower pH value than the corresponding portland cement paste.
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Acknowledgments
The writers would like to acknowledge the National Science Foundation (NSF) for funding of the present research under Research Grant No. (NSFCMS-0086819). All tests were performed at Iowa State University (ISU). Assistance from Materials Analysis and Research Laboratory (MARL) at ISU on TGA and XRD tests and the raw materials from Lafarge Corporation, Cement Group/U.S. Region are greatly appreciated.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 1 • January 2007
Pages: 112 - 119
Copyright
© 2007 ASCE.
History
Received: Jul 27, 2005
Accepted: Oct 9, 2005
Published online: Jan 1, 2007
Published in print: Jan 2007
Notes
Note. Associate Editor: Hilary I. Inyang
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