Patterns of gravity induced aggregate migration during casting of fluid concretes

Jon Spangenberg, N. Roussel, Jesper Henri Hattel, E.V. Sarmiento, G. Zirgulis, Mette Rica Geiker

Research output: Contribution to journalJournal articleResearchpeer-review

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.
Original languageEnglish
JournalCement and Concrete Research
Volume42
Issue number12
Pages (from-to)1571-1578
ISSN0008-8846
DOIs
Publication statusPublished - 2012

Keywords

  • Fresh concrete (A)
  • Rheology (A)
  • Aggregate (D)
  • Yield stress

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