Tremix flooring is also known as VDF Flooring which stands for Vacuum Dewatered Flooring. This is a special technique to do the Concrete Flooring to increase the Compressive Strength, Tensile Strength, Abrasion Resistance and to minimize the Shrinkage and Floor Wraps. VDF Flooring results in High Strength, Longer Life, Better Finish and Faster Work. This type of floor is suitable for high abrasion & heavy traffic movement.

Tremix Flooring Concrete Procedure OR VDF Flooring (Vaccum ...

The Vacuum Dewatered Flooring or VDF Flooring is a system for laying high quality concrete floors which is generally M 25 or M 30 grade of concrete. The main aspect of this flooring is Dewatering of Concrete by Vacuum Process where surplus water from the concrete is removed immediately after placing and vibration, thereby reducing the water:cement ratio to the optimum level.

Welcome to VDF Engineers

Procedure of VDF Flooring

1. First the level is marked on drilled rods and bind the Line Dori (Threads) as per the slope requirements on it.

2. Laying Guide Rails to every 4 meters using MS Channels or as required in straight lines along the Line Dori, taking levels as per the slope and fixing them using concrete also called grouting and left to set for a minimum of 24 hours

3. Pouring the concrete in between the two lines of channel and spreading the concrete manually by labours using Shovel or Hoe.

4. Vibrating the concrete with a needle vibrator especially to the sides of the panels to avoid the honeycomb at edges.

5. Surface Vibration of the concrete is achieved by using Double Beam Screed Vibrator running over the guide rails twice to achieve maximum compaction for RCC.

6. Final levelling of the concrete using the Straight Edge/Aluminium Bottom to prevent unwanted pits and getting even/flat surface.

7. A system of lower mats & top mat is laid on the green concrete & this is attached to a vacuum pump. This draws out surplus water if any. (As per my suggest avoid  dewatering of RMCs. RMCs have water cement ratio already maintained to its minimum possible level by addition of admixtures. Further dewatering decreases the water cement ratio below the required level thereby causing less heat of hydration which tends to loss in strength and formation of cracks.)

8. The concrete is left to stiffen. When the base concrete has stiffened to the point when foot traffic leaves an imprint of about 3-6 mm and surface water is evaporated, but the concrete should have a wet sheen appearance.

9. Application of Power Floater on the surface until the surface is sufficiently compacted & levelled with no major lines appearing any more.

10. Final finishing using Power Trowel and trowelling until the required finish is achieved. Finish could be any as per requirement of the Smooth Finish, Sand Finish or Line Finish.

11. Concrete expands and contract constantly with the changes in temperature which create the cracks on concrete surface. To prevent this cracks, Grooves are made on concrete within the 48 hours of placing the concrete. Generally the groove size is 5 mm width and 1/3 the thickness of concrete slab. after it, these grooves are filled with polysulphide sealent, liquid asphalt or other appropriate fillers. 
Mainly, six components are required in vacuum dewatering of concrete, which are given below:

1. Vacuum pump
It immediately removes surplus water from the concrete after placing and vibration.

2. Water separator
It is a suction mat cover laid on filter pads. It suck the water from filter pads and transfer the water through suction hose to vaccum pump.

3. Filtering pad
They are laid directly on green concrete which suck the water from the green concrete.

4. Screed board vibrator
It is used for vibration and compaction as well levelling the concrete floor. It consist high quality channel with spacing of 250 mm In-between. It has a special water protective motor mounted on center of its top. This screed vibrator is available in different length sizes from 2 meter to 5.5 meter. 

5. Power floater
It is a surface grinding equipment powered by 3 HP electric motor trough gear box with floating RPM of 130. It grinds the surface to make it wear resistance.

6. Power trowel
It is a surface finishing equipment just like the power floater. only the difference is in power floater the surface is grind and in power trowel the surface is finished and smooth. 

Advantages of Tremix flooring or Vacuum dewatered flooring over the conventional flooring:

  • Even and uniform surface
  • Increased Compressive strength of floor
  • Increased Tensile strength and splitting strength
  • Reduced Cement consumption (No cement is required for finishing the surface)    
  • Increased Abrasion resistance
  • Reduced water / cement ration
  • Increased Impact strength
  • Reduced number of joints
  • Less wear and tear of floor surface     

  Typical Application Areas of VDF Flooring

  • Warehouses, Godowns
  • Roads
  • Parking Areas
  • Production Areas
  • As the base floor for Epoxy & PU Floorings
  • Pharmaceutical companies etc.


Popular Posts