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• W2465785917 abstract "Summary: An evolution of distribution and orientation of fibres in the fibre reinforced self-compacting concrete during the casting process is an important matter as the final orientation and distribution of fibres can significantly influence mechanical properties of the structural elements. A two-way coupled model for flow of suspension of rigid solid particles in a non-Newtonian fluid with a free surface has been developed for such a purpose and is shortly presented in this paper. Several experiments using an apparent yield stress fluid, i.e. Carbopol® Ultrez 21 Polymer transparent gel, were conducted and analysed by means of digital image analysis. Orientation tensor fields coming from the digital image analysis were compared with the simulation to verify the ability of the model to properly represent the flow of the fibre reinforced self-compacting concrete. Knowledge of the final orientation and distribution of fibres is an important component in a proper understanding of the behaviour of cast structural elements. Self-compacting concrete is unfortunately not transparent which makes the experimental determination of the fibre orientation and distribution difficult. One approach in the determination of the fibre orientation might be to cast the structural element and retrieve a 3D image of the fibres using a CT scanning device [15]. Another approach might be to cast the element, cut it into sections and visually count the number of fibres at the crosssection [11]. In this paper, we present yet another approach where we, similarly to [2], substituted the self-compacting concrete by suspension of fibres in transparent Carbopol Ultrez 21 Polymer (from now on called Carbopol) allowing a direct observation of fibres. Experimental determination of the orientation and dispersion of fibres in the self-compacting concrete is a time and resource consuming procedure. A model capable of properly simulating the given problem is therefore desired. We have developed such a model and briefly introduce it in this paper. Finally we compare the resulting fibre orientation fields coming from the experiment with the fibre orientation fields coming from the simulation model. The orientation fields of fibres are represented by second order orientation tensor fields [1]. 2 METHODS In this section, we present the two-ways coupled model for the flow of suspensions of rigid solid particles in non-Newtonian fluid. The model consists of the fluid dynamics part used to predict the free surface flow of a homogeneous fluid solved using the Lattice Boltzmann method [12, 16]. The other part of the model predicts the time and space evolution of the solid particle suspension where dynamics of the solid particles is solved using Newton's classical equations of motion. Mutual interactions between the fluid and the solid particles are represented by means of the Immersed Boundary Method with direct forcing [4]." @default.
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• W2465785917 date "2012-01-01" @default.
• W2465785917 modified "2023-09-25" @default.
• W2465785917 title "Fibre reinforced self-compacting concrete flow simulations in comparison with l-box experiments using carbopol" @default.
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