Vaccum Concrete. : The concrete from which water is extracted by a vaccum process before the hardening takes place.

Steps:

1. Formwork: The MS channels are generally used as the formwork. They act as stopper and also as the support for putting the screed vibrator.

2. Concrete Pour: Concrete of required mix proportion is poured in the panel form formed by M.S Channels.

3. Internal Vibrator: Once the concrete is poured in a panel. It is internally vibrated by the middle vibrator.

4. Surface Vibration & Levelling: The screen vibrator is place resting on M.S Channels at one end of panel. As vibrations continues the screed vibrator is pulled manually at each end, towards the other end, towards the other end of the panel. Two passes of screed vibrator are recommended for the best results.

The screen vibration gives smooth and levelled concrete surface

Vaccum Process: Filler and top mat are placed on the concrete surface. The nose of topmat is connected to suction side of Vaccum pump. The surplus water is entranced out of the concrete by the Vaccum pump. The concrete is compacted tightly as the dewatering progresses.

Floating: The floating operation is carried out immediately after vaccum dewatering by means of power floater. The cement particles are split apart and mixed with the sand particles which gives a very hard and wear resistance surface.

Trowelling: In order to further improve the wearing resistance and give very smooth surface the concrete surface is power trowelled.

Advantages:

1. Increase of final strength of concrete by 25%.

2. Sufficient decrease in permeability of concrete.

3. High density concrete.

4. Increase of about 20% bond strength of concrete.

5. Appreciable reduction of time for final finishing.

6. Early removal of wall forms.

7. Surfaces entirely free from pitting.

Applications:

1. Industrial Floors.

2. Workshops.

3. Railway Platforms.

4. Warehouse.

5. Concrete Roads.

6. Parking Lots

7. Basements.

8. Docks

9. Airport Runways, Bangers, Apron, Taxiway, Etc.