Effect of Particle Density on Its Rebound in Dry-Mix Shotcrete
Publication: Journal of Materials in Civil Engineering
Volume 21, Issue 2
Abstract
When concrete is sprayed during shotcreting, inevitably some material is lost due to rebound. The relative losses for coarse aggregates and fibers are higher than that for the rest, and therefore the composition of the material in-place is deficient in these phases. In order to compensate for such loss and indeed to minimize it, one must identify the parameters affecting rebound and comprehend the underlying mechanisms. Recent work has established a theory of rebound for coarse aggregates. However, fibers differ from aggregates in their material and geometric properties and the effect of these must be understood in order to extend the existing theory of rebound to fibers. This is a study on the influence of particle density upon the rebound of a projectile impinging via the dry-mix process onto fresh shotcrete. The empirical model developed in this study postulates that a lower aggregate density favors lower rebound and this prediction was verified using two kinds of lightweight aggregates in dry-mix shotcrete.
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Acknowledgments
The writers would like to thank Synthetic Industries (Chattanooga, Tenn.) and NSERCNRC, Canada for funding part of the research presented here. The writers gratefully acknowledge the support from Mr. Rodney Hicks (Lehigh Cement Company, Vancouver, B.C.) and Mr. Garth Carefoot (Great Pacific Pumice Inc., Vancouver, B.C.) for supplying the lightweight expanded clay and pumice aggregates, respectively. In addition, the assistance of Mr. Fariborz Madjzadeh and Mr. David Woo in conducting the experiments is much appreciated.
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 21 • Issue 2 • February 2009
Pages: 58 - 64
Copyright
© 2009 ASCE.
History
Received: Mar 28, 2006
Accepted: Jul 1, 2008
Published online: Feb 1, 2009
Published in print: Feb 2009
Notes
Note. Associate Editor: Christopher K. Y. Leung
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