- April 21, 2022
-- What is Vacuum Concrete?
Vacuum concrete is a type of concrete in which excess water is removed by vacuum pressure after the placement of concrete structural members using vacuum mats connected to a vacuum pump. The goal of vacuum concrete
is to increase the strength of the concrete
. It is more durable than regular concrete.Vacuum Concrete Process
1. A large amount of vacuum is present on the top surface of the concrete during the vacuum dewatered concrete
2. A large amount of water is removed from a specific depth of the concrete during vacuum concrete processing.
3. Vacuum concrete is made by laying porous mats connected by a vacuum pump.
4. The final water cement ratio before setting is then reduced, and the concrete gains strength.
5. Vacuum concrete contains a greater strength capacity, a lower permeability, and a higher durability property, making it a very effective material to use.The Use of Vacuum Concrete
- The vacuum concrete is mostly used in Hydropower plants.
- A cooling tower is a vacuum concrete application.
- Another use for vacuum concrete is on industrial floors, cold storages, and so on.
- Vacuum concrete is widely used in port and harbour bridges.
Given below advantages and disadvantages of vacuum concrete
:There are numerous advantages to using vacuum concrete, including:
- One of the primary benefits of vacuum concrete is that its density is higher than that of other types of concrete (https://www.sketchup3dconstruction.com/const/types-of-con...).
- The vacuum concrete has a decreasing permeability power, which is also one of its main advantages.
- A reduction in the water-cement ratio may increase compressive strength by 10 to 50% while decreasing permeability.
- Because of the high stiffness of this concrete, the formwork and columns of 20 feet in height can be easily removed in 30 minutes.
- Vacuum concrete has a bond strength that is 20% greater than other concrete.
- One of the main advantages of this vacuum concrete is its low cost, so it's a good investment.
- The inherent porosity of the concrete allows water, oil, and grease to seep through, weakening it.
- Joints are required for concrete floors (https://www.constructionnews.co.in/concrete-floor-slab-co...) (to accommodate shrinkage, thermal movements, and so on), which can lead to joint breakage and seepage of the aforementioned contaminants.
- Power is used for dewatering, which raises the cost.
- Special tools are required.
- The initial investment is much higher.
- The vacuum dewatered concrete process necessitates the use of skilled labourers.
- It is not well suited to concrete with a water-cement ratio less than 0.4.