Experimental and Numerical Investigation of Particle Kinematics in Shotcrete
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 11
Abstract
The intent of this paper is to identify the basic physical laws governing particle kinematics in a shotcrete spray. This paper presents a governing equation based on Newton’s second law where nozzle and airflow characteristics, and particle features are used to predict impact velocity of the material exiting the nozzle. Experimental values obtained using high-speed imaging measurements on marbles and aggregate particles correlate well with the results of numerical simulations on a simplified spraying system. With the controlling parameters of particle kinematics fully understood, the analysis of the governing equations offers essential elements for nozzle optimization and new mix design investigations. This paper also addresses the necessity of broadening the investigation to the entire spray of particles exiting the nozzle for a complete understanding of the spraying process on placement mechanisms at a process scale.
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Acknowledgments
The authors are grateful to the Natural Sciences and Engineering Research Council of Canada (NSERC), King Packaged Materials and Co. and to the Fonds de Recherche du Québec—Nature et Technologies (FQRNT) for their financial support of this project.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 11 • November 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 16, 2013
Accepted: Mar 31, 2014
Published online: Jun 18, 2014
Published in print: Nov 1, 2014
Discussion open until: Nov 18, 2014
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