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Influence of the packing density of fine particles on structure, strength and durability of UHPC
Ultra-High Strength Concretes or better known as Ultra-High Performance Concrete (UHSC/UHPC) are made using a very low amount of water and a high amount of cement and fines. These materials are characterized by a dense microstructure, obtained by the particle packing improvement, combined with the very low water cement ratio. The sufficent workability is obtained by using superplastizisers in combination with the low water demand of the fresh concrete due to the high packing density of the fines. The particle packing is improved using sub-micron particles which extend the particles size range and allows to fill the hollow spaces in between the cement grains. The mechanical performance and the durability of Ultra-High Strength Concretes are conditioned by the packing density as well. That means, the view at the micrometer and nanometer scale is necessary to really understand the very special nature of UHPC. This paper shows some of the fundamental research results, focused on the structural properties of Ultra-High Strength Concrete and on its influence on the strength and durability.
Influence of the packing density of fine particles on structure, strength and durability of UHPC
Ultra-High Strength Concretes or better known as Ultra-High Performance Concrete (UHSC/UHPC) are made using a very low amount of water and a high amount of cement and fines. These materials are characterized by a dense microstructure, obtained by the particle packing improvement, combined with the very low water cement ratio. The sufficent workability is obtained by using superplastizisers in combination with the low water demand of the fresh concrete due to the high packing density of the fines. The particle packing is improved using sub-micron particles which extend the particles size range and allows to fill the hollow spaces in between the cement grains. The mechanical performance and the durability of Ultra-High Strength Concretes are conditioned by the packing density as well. That means, the view at the micrometer and nanometer scale is necessary to really understand the very special nature of UHPC. This paper shows some of the fundamental research results, focused on the structural properties of Ultra-High Strength Concrete and on its influence on the strength and durability.
Influence of the packing density of fine particles on structure, strength and durability of UHPC
Teichmann, Thomas (author) / Schmidt, Michael (author)
2004
11 Seiten, 10 Bilder, 3 Tabellen, 8 Quellen
Conference paper
English
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