Alkali-Silica Reaction in Concrete with Previously Inert Aggregates
Publication: Journal of Performance of Constructed Facilities
Volume 31, Issue 2
Abstract
Alkali-silica reaction (ASR) is a persistent issue and has evaded eradication for nearly 80 years. The problem stems from a lack of standardized testing of aggregates. Cases occur when changes in material properties lead to potentially reactive aggregates reacting with higher alkali cements. A research program was established at the University of Arkansas to investigate cases of ASR, which occurred in combination with previously inert aggregates. In addition, locally available fly ashes were evaluated to determine replacement rates required to minimize the risk of ASR. A field monitoring program was established to evaluate deterioration mechanisms and mitigation measures. A concrete barrier wall located near the University of Arkansas was diagnosed with ASR that had considerable variation in the damage between sections of the wall. Deterioration ranges from minimal visible deterioration to severe damage or complete failure. The testing program reveals that certain aggregates that were previously deemed safe for use in concrete reacted deleteriously when other material properties changed.
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Acknowledgments
The authors would like to thank the Arkansas State Highway Transportation Department (AHTD) for funding and supporting this project. AHTD personnel were instrumental in providing access to the concrete wall during site visits throughout the duration of the project. Mack Blackwell Rural Transportation Center (MBTC) also provided support for the research program. Headwaters Resources, Inc., and Ash Grove cement provided materials used in the laboratory portion of the study. Several students at the University of Arkansas, Department of Civil Engineering were invaluable in conducting the research program.
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Information & Authors
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Published In
Journal of Performance of Constructed Facilities
Volume 31 • Issue 2 • April 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Feb 5, 2016
Accepted: Jun 3, 2016
Published online: Jul 18, 2016
Discussion open until: Dec 18, 2016
Published in print: Apr 1, 2017
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