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Vacuum mixing: a new way of air content reduction in UHPC

Jeroen Dils UGent, Veerle Boel UGent and Geert De Schutter UGent (2013) PRO 84. 2. p.1782-1790
abstract
The production of ultra-high performance concrete is made possible by a combination of an optimal packing density, a suitable mixing procedure and an effective match between a third generation superplasticizer and the binders. By increasing the level of performance, it is questionable how the robustness of the mixture evolves. What is the impact of a change in proportioning. An undesirable increase in air content can alter the fresh and hardened properties. For this, vacuum mixing can help. Because little is known about this new technology, research is necessary. We tested the influence of a reduced air pressure in the mixing pan on the microstructure and the mechanical performance of ultra-high performance concrete. This paper reports the impact on the hardened air content, the specific pore surface, the spacing factor and the compressive strength. The hardened air content decreased for all mixtures tested in this program. A reduction of the air pressure to 50 mbar, reduced the air cavities. Depending on the workability of the mixture, this led to an increase in the specific pore surface and the spacing factor. The improved microstructure led to a higher compressive strength. An average gain between 8% and 18% was determined. In conclusion, the air content can be controlled and a higher performance is achieved. Further research, should be focussed on the influence of vacuum mixing on the durability of ultra-high performance concrete.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
Vacuum mixing, UHPC, compressive strength, air void analysis
in
PRO 84
editor
ZJ Li, W Sun, CW Miao, K Sakai, OE Gjorv and N Banthia
volume
2
pages
1782 - 1790
publisher
RILEM Publications S.A.R.L.
place of publication
Bagneux, France
conference name
Concrete under Severe Conditions : Environment and Loading (CONSEC - 2013)
conference location
Nanjing, China
conference start
2013-09-23
conference end
2013-09-25
ISBN
9782351581247
language
English
UGent publication?
yes
classification
C1
copyright statement
I have transferred the copyright for this publication to the publisher
id
4150508
handle
http://hdl.handle.net/1854/LU-4150508
date created
2013-10-03 14:32:31
date last changed
2017-01-02 09:53:12
@inproceedings{4150508,
  abstract     = {The production of ultra-high performance concrete is made possible by a combination of an optimal packing density, a suitable mixing procedure and an effective match between a third generation superplasticizer and the binders. By increasing the level of performance, it is questionable how the robustness of the mixture evolves. What is the impact of a change in proportioning. An undesirable increase in air content can alter the fresh and hardened properties. For this, vacuum mixing can help. Because little is known about this new technology, research is necessary. We tested the influence of a reduced air pressure in the mixing pan on the microstructure and the mechanical performance of ultra-high performance concrete. This paper reports the impact on the hardened air content, the specific pore surface, the spacing factor and the compressive strength. The hardened air content decreased for all mixtures tested in this program. A reduction of the air pressure to 50 mbar, reduced the air cavities. Depending on the workability of the mixture, this led to an increase in the specific pore surface and the spacing factor. The improved microstructure led to a higher compressive strength. An average gain between 8\% and 18\% was determined. In conclusion, the air content can be controlled and a higher performance is achieved. Further research, should be focussed on the influence of vacuum mixing on the durability of ultra-high performance concrete.},
  author       = {Dils, Jeroen and Boel, Veerle and De Schutter, Geert},
  booktitle    = {PRO 84},
  editor       = {Li, ZJ and Sun, W and Miao, CW and Sakai, K and Gjorv, OE and Banthia, N},
  isbn         = {9782351581247},
  keyword      = {Vacuum mixing,UHPC,compressive strength,air void analysis},
  language     = {eng},
  location     = {Nanjing, China},
  pages        = {1782--1790},
  publisher    = {RILEM Publications S.A.R.L.},
  title        = {Vacuum mixing: a new way of air content reduction in UHPC},
  volume       = {2},
  year         = {2013},
}

Chicago
Dils, Jeroen, Veerle Boel, and Geert De Schutter. 2013. “Vacuum Mixing: a New Way of Air Content Reduction in UHPC.” In PRO 84, ed. ZJ Li, W Sun, CW Miao, K Sakai, OE Gjorv, and N Banthia, 2:1782–1790. Bagneux, France: RILEM Publications S.A.R.L.
APA
Dils, J., Boel, V., & De Schutter, G. (2013). Vacuum mixing: a new way of air content reduction in UHPC. In ZJ Li, W. Sun, C. Miao, K. Sakai, O. Gjorv, & N. Banthia (Eds.), PRO 84 (Vol. 2, pp. 1782–1790). Presented at the Concrete under Severe Conditions : Environment and Loading (CONSEC - 2013), Bagneux, France: RILEM Publications S.A.R.L.
Vancouver
1.
Dils J, Boel V, De Schutter G. Vacuum mixing: a new way of air content reduction in UHPC. In: Li Z, Sun W, Miao C, Sakai K, Gjorv O, Banthia N, editors. PRO 84. Bagneux, France: RILEM Publications S.A.R.L.; 2013. p. 1782–90.
MLA
Dils, Jeroen, Veerle Boel, and Geert De Schutter. “Vacuum Mixing: a New Way of Air Content Reduction in UHPC.” PRO 84. Ed. ZJ Li et al. Vol. 2. Bagneux, France: RILEM Publications S.A.R.L., 2013. 1782–1790. Print.