Optimization of rheological properties of self-consolidating concrete by means of numerical simulations, to avoid formwork filling problems in presence of reinforcement bars.
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2012-02-01
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Abstract:The influence of the rebar configuration on the occurrence of dead zones (= zero velocity) during flow of Self-Consolidating Concrete
in formworks has been investigated by single fluid numerical simulations. The main findings showed that for small inter-rebar
spacing, the shear stress in the concrete cover becomes very low. The rebars act as virtual walls, concentrating the SCC flow between
them. Once the concrete cover is thus filled, the SCC remains stationary and can thus induce entrapment of air or a cold joint between
the stationary concrete in the cover and the moving concrete in the center of the formwork. The numerical simulations have revealed
that the SCC must be close to self-levelling to avoid the dead zones in case of a dense reinforcement grid. Increasing the spacing
between the rebars and, to a minor extent, increasing the concrete cover allow for SCC with higher yield stresses, and thus lower
viscosities to be employed, while avoiding the occurrence of the dead zones.
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