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Methods for modelling and calculation of high density packing for cement and fillers in UHPC
The hardened concrete matrix of Ultra-High Performance Concrete (UHPC) is very dense and shows extraordinary strength and durability properties. These features are the result of the use of fine powders to increase the packing density of the matrix. The properties of fresh UHPC like viscosity and resistance against sedimentation are improved as well. Hence, the homogeneity, the density and the deformation resistance of the hardened concrete can be increased. The low water-cement-ratio (w/c) of about 0.20 is one reason for the high compressive strength higher than 200 N/mm2. Another reason is the optimization of different fine and finest materials up to a particle size of 0.5 mm. The selective choice of these materials result in a high packing density, a decrease of porosity of the concrete matrix and almost self-compacting concrete properties. One way to describe the packing design of the materials is the specific solid volume of the binder matrix, specified as the volumetric ratio of water to solid volume including cement and all other fine particles (w/F(V)). The other way is the application of models and computer simulations covering all necessary variables of the mixture and the raw materials like particle size distribution, particle shape and particle density. In this study, a packing procedure is presented for mixture proportioning of UHPC to be produced with locally available materials and the influence of the packing density on different properties of fresh and hardened concrete.
Methods for modelling and calculation of high density packing for cement and fillers in UHPC
The hardened concrete matrix of Ultra-High Performance Concrete (UHPC) is very dense and shows extraordinary strength and durability properties. These features are the result of the use of fine powders to increase the packing density of the matrix. The properties of fresh UHPC like viscosity and resistance against sedimentation are improved as well. Hence, the homogeneity, the density and the deformation resistance of the hardened concrete can be increased. The low water-cement-ratio (w/c) of about 0.20 is one reason for the high compressive strength higher than 200 N/mm2. Another reason is the optimization of different fine and finest materials up to a particle size of 0.5 mm. The selective choice of these materials result in a high packing density, a decrease of porosity of the concrete matrix and almost self-compacting concrete properties. One way to describe the packing design of the materials is the specific solid volume of the binder matrix, specified as the volumetric ratio of water to solid volume including cement and all other fine particles (w/F(V)). The other way is the application of models and computer simulations covering all necessary variables of the mixture and the raw materials like particle size distribution, particle shape and particle density. In this study, a packing procedure is presented for mixture proportioning of UHPC to be produced with locally available materials and the influence of the packing density on different properties of fresh and hardened concrete.
Methods for modelling and calculation of high density packing for cement and fillers in UHPC
Geisenhanslüke, Carsten (author) / Schmidt, Michael (author)
2004
10 Seiten, 7 Bilder, 1 Tabelle, 24 Quellen
Conference paper
English
Methods for Modelling and Calculation of High Density Packing for Cement and Fillers in UHPC
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