Patterns of gravity induced aggregate migration during casting of fluid concretes

Details

Serval ID
serval:BIB_B2D993593626
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Patterns of gravity induced aggregate migration during casting of fluid concretes
Journal
Cement and Concrete Research
Author(s)
Spangenberg J.E., Roussel N., Hattel J.H., Sarmiento E.V., Zirgulis G., Geiker M.R.
ISSN-L
0008-8846
Publication state
Published
Issued date
2012
Peer-reviewed
Oui
Volume
42
Pages
1571-1578
Language
english
Notes
ISI:000313154700002
Abstract
In this paper, aggregate migration patterns during fluid concrete
castings are studied through experiments, dimensionless approach and
numerical modeling. The experimental results obtained on two beams show
that gravity induced migration is primarily affecting the coarsest
aggregates resulting in a decrease of coarse aggregates volume fraction
with the horizontal distance from the pouring point and in a puzzling
vertical multi-layer structure. The origin of this multi layer structure
is discussed and analyzed with the help of numerical simulations of free
surface flow. Our results suggest that it finds its origin in the non
Newtonian nature of fresh concrete and that increasing casting rate
shall decrease the magnitude of gravity induced particle migration. (C)
2012 Elsevier Ltd. All rights reserved.
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16/02/2013 19:57
Last modification date
20/08/2019 15:21
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