Effects of Coarse Aggregate Coatings on Concrete Performance
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 1
Abstract
There is evidence that the presence of certain microfine coatings on coarse aggregates encountered in actual field conditions and accepted for state projects has adverse consequences for the properties of hardened concrete. The purpose of this research was to investigate the influence of natural coarse aggregate coatings on physical properties of concrete and to establish how each of the three common monitoring tests (ASTM C117, Caltrans Test No. 227, and AASHTO TP57) predict the influence of these coatings on the quality of the resulting concrete. Seven mixtures of concrete were prepared with coarse aggregate containing two types of coatings: natural field-coated aggregates, and manufactured coated samples of dust and clay fines. The effects of these coatings on concrete performance were assessed by comparing the relative changes in the physical and mechanical properties of the concrete against concrete made with washed aggregate. The study confirmed that the extent and nature of the impact depend on the quantity and nature of the microfine, and therefore the current ASTM C117 is not an adequate monitoring tool.
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Acknowledgments
Financial support for this research by the Wisconsin Department of Transportation through the Wisconsin Highway Research Program under Grant No. UNSPECIFIED0092-00-07 is gratefully acknowledged. Accomplishment of the research was achieved through the valued contributions of a team of experts in both the WisDOT and participating industry. The cooperation of member companies of the Wisconsin Concrete Pavement Association in working in the field, and the technical and administrative assistance of WCPA staff were the key for the completion of the work.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 1 • January 2010
Pages: 96 - 103
Copyright
© 2010 ASCE.
History
Received: Jun 18, 2008
Accepted: Jun 3, 2009
Published online: Dec 15, 2009
Published in print: Jan 2010
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