Effectiveness of Fly Ash and Slag in Mitigating Alkali–Silica Reaction Induced by Deicing Chemicals
Publication: Journal of Materials in Civil Engineering
Volume 21, Issue 1
Abstract
Recent studies have shown that potassium acetate based deicers are capable of triggering deleterious expansion and cracking in concrete specimens containing alkali–silica reactive (ASR) aggregates. This paper presents the results and analysis from a research study conducted to evaluate the effectiveness of fly ash and ground granulated blast furnace slag (slag) in mitigating expansions induced by ASR in the presence of a potassium acetate based deicer. Standard and modified ASTM C 1260 and 1567 tests were conducted on mortar specimens prepared with five aggregates to study the mitigation behavior of fly ashes and slag. In this study, fly ash was evaluated at 15, 25, and 35%, and slag at 40 and 50% by mass replacement of cement. Changes in length, dynamic elastic modulus, and microstructure of the mortar bars were studied. Results from these studies indicate that low- and intermediate-lime fly ashes were more effective than high-lime fly ash at 25 and 35% cement replacement levels. High-lime fly ash was ineffective even at a replacement level of 35%. Slag at 50% cement replacement was more effective in mitigating expansions compared to 40% dosage level.
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Acknowledgments
The support of Innovative Pavements Research Foundation (IPRF) and FAA for this project is gratefully acknowledged. Thanks are also extended to ISG Resources, Inc. and Holcim, Inc. for providing the SCMs.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 21 • Issue 1 • January 2009
Pages: 19 - 31
Copyright
© 2009 ASCE.
History
Received: Oct 24, 2006
Accepted: Oct 18, 2007
Published online: Jan 1, 2009
Published in print: Jan 2009
Notes
Note. Associate Editor: Maria C. G. Juenger
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