TY - JOUR
T1 - Flow induced particle migration in fresh concrete: Theoretical frame, numerical simulations and experimental results on model fluids
AU - Spangenberg, J.
AU - Roussel, N.
AU - Hattel, J.H.
AU - Stang, H.
AU - Skocek, J.
AU - Geiker, M.R.
PY - 2012
Y1 - 2012
N2 - In this paper, we describe and compare the various physical phenomena which potentially lead to flow induced particle migration in concrete. We show that, in the case of industrial casting of concrete, gravity induced particle migration dominates all other potential sources of heterogeneities induced by flow. We then show, from comparisons between experiments using model materials, dimensional analysis and numerical simulations, that, from a quantitative point of view, the viscous drag force, which prevents particles from migrating during a casting process, shall neither be computed from the apparent viscosity nor from the plastic viscosity of the suspending phase but from its tangential viscosity. Finally, the transfer of this type of numerical prediction tool to real concrete is discussed.
AB - In this paper, we describe and compare the various physical phenomena which potentially lead to flow induced particle migration in concrete. We show that, in the case of industrial casting of concrete, gravity induced particle migration dominates all other potential sources of heterogeneities induced by flow. We then show, from comparisons between experiments using model materials, dimensional analysis and numerical simulations, that, from a quantitative point of view, the viscous drag force, which prevents particles from migrating during a casting process, shall neither be computed from the apparent viscosity nor from the plastic viscosity of the suspending phase but from its tangential viscosity. Finally, the transfer of this type of numerical prediction tool to real concrete is discussed.
KW - Fresh concrete (A)
KW - Rheology (A)
KW - Aggregate (D)
KW - Modelling (E)
KW - Segregation
U2 - 10.1016/j.cemconres.2012.01.007
DO - 10.1016/j.cemconres.2012.01.007
M3 - Journal article
SN - 0008-8846
VL - 42
SP - 633
EP - 641
JO - Cement and Concrete Research
JF - Cement and Concrete Research
IS - 4
ER -