What Is Vacuum Concrete?
Vacuum concrete is that type of concrete where the extra water is removed for increasing the strength of concrete. A small part of concreting part is constructing by vacuum concrete of slab and walls; then, we need to maintain the water-cement ratio 0.5-0.65.
If we remove the excess water and air from the vacuum concrete at the time of constructing, then we get a better strength. We use a vacuum pump, surface treatment for the treatment of vacuum concrete.
Application of Vacuum Concrete
- The main application of vacuum concrete is hydropower plants.
- Vacuum concrete application is a cooling tower.
- The another application of vacuum concrete is on the industrial floor, cold storages, etc.
- Vacuum concrete is widely used in bridges of ports and harbours.
Advantages of Vacuum Concrete
There are many advantages of vacuum concrete, those are:
- The one of the main advantages of vacuum concrete is the density of this concrete is higher than other concrete.
- The vacuum concrete has decreasing power of permeability; it is also one of the main advantage.
- The final strength of concrete is increased by 25% than any other concrete.
- The stiffness of this concrete is very high; that’s why the formwork is easily removed within 30 minutes and columns of the height of 20 feet.
- Vacuum concrete has a bond strength of 20% higher than other concrete.
- The one of the main advantages of this vacuum concrete is the cost of this is reasonable, so it’s economical. Vacuum concrete is mainly used in the precast factory.
- Vacuum concrete creates well bonds with older concrete; this is the main reason for using this concrete for repair purpose. This is mainly used in road slab repair.
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Disadvantages of Vacuum Concrete
Here, the cons of vacuum concrete are as follows.
- One of the main disadvantages of vacuum concrete is it requires specific equipment than other concrete, so this is the main cause of the increase in the cost of concrete.
- Vacuum concrete needs more skillful labour; it’s another disadvantage.
- The initial cost of vacuum concrete is higher than the normal one.
- Vacuum concrete needs more power consumption for using special and specific equipment.
- The porosity of vacuum concrete is a little bit higher than normal concrete; for this reason, it allows to move the of substances like oil, water, grease, etc.
Process of Vacuum Concrete
Here, the process of vacuum concrete are as follows.
- In normal concrete, workability is the main factor to speed up the construction work, but we don’t think too much about the workability of vacuum concrete.
- In the vacuum concrete procedure, there is a huge amount of vacuum present on the top surface of the concrete.
- In vacuum concrete processing, there are a large amount of water is removed from a certain depth of the concrete.
- Vacuum concrete is constructed by laying porous mats which are connected by a vacuum pump.
- After that, the water-cement is reduced, and the concrete gains it is strength.
- Vacuum concrete has higher strength capacity, low permeability, and higher durability property, which make the concrete very effective to use.