6. Vacuum concrete dewatering
The purpose of vacuum dewatering is to remove the excess water that concrete needs to be transported, poured and worked, but which does not participate in the hydration reactions of the cement present. In addition, it is important to eliminate this excess water, as it can generate matrix porosity that limits the development of the concrete's mechanical performance and durability.
6.1 Principles of spinning
The expulsion of excess water creates an internal vacuum in the concrete, so that atmospheric pressure acts on the surface of the concrete. This vacuum is created by placing a suction mat on top of the fresh concrete, connected to a vacuum pump. The air pressure in the intermediate space and the top of the concrete is reduced to 20% of atmospheric pressure,...
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Vacuum concrete dewatering
Conclusion
Bibliography
Standards and norms
- Repair and reinforcement of concrete and masonry structures – shotcrete. - NF P 95-102 -
- Project concrete – Part 1: Definitions, specifications and compliance. - NF EN 14487-1 -
- Shotcrete – Part 2: Execution. - NF EN 14487-2 -
- Shotcrete tests – Part 1: sampling of fresh and hardened concrete. - NF EN 14488-1 -
- Shotcrete tests – Part 2: early age compressive strength of shotcrete. -...
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ASQUAPRO – Association for the quality of concrete spraying
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