Remediation and Air Void Stability of Hauled Self-Consolidating Concrete
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 9
Abstract
In the production of self-consolidating concrete (SCC), long hauling times are often necessary for transportation to the job site. During such hauling time, highly fluid SCC can lose a significant amount of slump flow, necessitating the mixtures to be remediated. Consequently, hauling and remediation can have a detrimental effect on the air void size and spacing, which are necessary characteristics for guaranteeing adequate frost durability in the hardened concrete. The purpose of this investigation was to determine the effects of two forms of remediation, overdosing and retempering, on the air void characteristics of SCC. Three slump flows of 559, 635, and 711 mm and eight hauling times from 20 to 90 min were studied. The required admixture dosage for each remediation technique depended on the target slump flow and hauling time duration. Hauling time and remediation caused the air content to increase and air void characteristics to improve from their initial state, although they typically were inferior to the nonremediated mixtures. Both forms of remediation exhibited similar trends in air void characteristics with hauling time.
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Acknowledgments
The contributions of a number of materials manufacturers are greatly appreciated, without which this research would not have been possible.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 9 • September 2010
Pages: 905 - 913
Copyright
© 2010 ASCE.
History
Received: Sep 25, 2008
Accepted: Feb 11, 2010
Published online: Feb 24, 2010
Published in print: Sep 2010
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