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Abstract
The influence of vacuum mixing of UHPC on the compressive and tensile strength, and Young's modulus is examined. These mechanical properties are influenced by the microstructure and the pore system. Classical models predicting these properties based on the water-to-cement ratio do not consider the effect of vacuum mixing, which is quite new. This will be even more important in the case of UHPC because of the extremely low water-to-cement ratio and the larger influence of changes in air content. In this research, two different mixer sizes are considered : a vacum paste mixer (capacity of 5 liter) and a vacuum concrete mixer (capacity of 75 liter). For each mixer, three different pressure levels are examined : vacuum (100 mbar), semi-vacuum (500 mbar) and atmospheric pressure (1013 mbar). The influence of heat treatment (90°C) in CoMParison or combination with vacuum mixing is evaluated by means of the compressive strength on concrete cubes 100 mm.
Keywords
vacuum mixing, Young's modulus, UHPC, compressive & tensile strength

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Citation

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Chicago
Dils, Jeroen, Geert De Schutter, Veerle Boel, and Egon Braem. 2012. “Influence of Vacuum Mixing on the Mechanical Properties of UHPC.” In 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials : Ultra-High Performance Concrete and Nanotechnology in Construction, Proceedings, ed. Michael Schmidt, Ekkehard Fehling, C Glotzbach, S Fröhlich, and S Piotrowski, 19:241–248. Kassel, Germany: Kassel University Press GmbH.
APA
Dils, J., De Schutter, G., Boel, V., & Braem, E. (2012). Influence of vacuum mixing on the mechanical properties of UHPC. In Michael Schmidt, E. Fehling, C. Glotzbach, S. Fröhlich, & S. Piotrowski (Eds.), 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials : Ultra-High Performance Concrete and Nanotechnology in Construction, Proceedings (Vol. 19, pp. 241–248). Presented at the 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials : Ultra-High Performance Concrete and Nanotechnology in Construction (HIPERMAT - 2012), Kassel, Germany: Kassel University Press GmbH.
Vancouver
1.
Dils J, De Schutter G, Boel V, Braem E. Influence of vacuum mixing on the mechanical properties of UHPC. In: Schmidt M, Fehling E, Glotzbach C, Fröhlich S, Piotrowski S, editors. 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials : Ultra-High Performance Concrete and Nanotechnology in Construction, Proceedings. Kassel, Germany: Kassel University Press GmbH; 2012. p. 241–8.
MLA
Dils, Jeroen, Geert De Schutter, Veerle Boel, et al. “Influence of Vacuum Mixing on the Mechanical Properties of UHPC.” 3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials : Ultra-High Performance Concrete and Nanotechnology in Construction, Proceedings. Ed. Michael Schmidt et al. Vol. 19. Kassel, Germany: Kassel University Press GmbH, 2012. 241–248. Print.
@inproceedings{3006380,
  abstract     = {The influence of vacuum mixing of UHPC on the compressive and tensile strength, and Young's modulus is examined. These mechanical properties are influenced by the microstructure and the pore system. Classical models predicting these properties based on the water-to-cement ratio do not consider the effect of vacuum mixing, which is quite new. This will be even more important in the case of UHPC because of the extremely low water-to-cement ratio and the larger influence of changes in air content. In this research, two different mixer sizes are considered : a vacum paste mixer (capacity of 5 liter) and a vacuum concrete mixer (capacity of 75 liter). For each mixer, three different pressure levels are examined : vacuum (100 mbar), semi-vacuum (500 mbar) and atmospheric pressure (1013 mbar). The influence of heat treatment (90{\textdegree}C) in CoMParison or combination with vacuum mixing is evaluated by means of the compressive strength on concrete cubes 100 mm.},
  author       = {Dils, Jeroen and De Schutter, Geert and Boel, Veerle and Braem, Egon},
  booktitle    = {3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials : Ultra-High Performance Concrete and Nanotechnology in Construction, Proceedings},
  editor       = {Schmidt, Michael and Fehling, Ekkehard and Glotzbach, C and Fr{\"o}hlich, S and Piotrowski, S},
  isbn         = {9783862192649},
  keyword      = {vacuum mixing,Young's modulus,UHPC,compressive \& tensile strength},
  language     = {eng},
  location     = {Kassel, Germany},
  number       = {19},
  pages        = {241--248},
  publisher    = {Kassel University Press GmbH},
  title        = {Influence of vacuum mixing on the mechanical properties of UHPC},
  volume       = {19},
  year         = {2012},
}