What is Vacuum Concrete , its Types , Working, Uses, Advantages, Disadvantages ?

Almost Everyday a New Type of Concrete and Cement has been Developed by the Civil Researchers and some of the Research Work is been running under Government Agencies , The One and only goal of running All these Research Work is only to Achieve the Quality as well as Minimizing the economy in the Construction Field. The Same thing was Invented few Days Ago but Not Currently in Proper use due to Lack of Knowledge or many other terms are their and the Name is Vacuum Concrete ,

When we listen to the word Vacuum only one thing Strikes in our mind that it sucks and According to me Vacuum Concrete is a Concrete that Sucks water out of It and Talking in the Formal way Vacuum Concrete is a Concrete in which the water to cement ratio is increased by some factor in order to achieve compaction as well as Workability and After that the same factor of that water is removed from the Concrete After Placing . So Following are some of the Properties or Specification of the Vacuum Concrete :
  • Water to Cement Ratio - 50% - 65%
  • Size of Aggregates Used - Small
  • Mixing Speed - High
  • Density - Low
  • Unit Weight - Lighter
  • Workability - High
What is Need of Vacuum Concrete ?
This is the Most Important Part due to which you are here to read this article , Well some of Reasons are enlisted Below on Why we need this Vacuum Concrete as follows :
  • In Small Depth Sections Like Slabs and Walls as well as Precast Concrete Elements , The Concrete with More Water to cement Ratio is Needed and in Vacuum concrete we can increase the water to cement ratio according to us and After that we can Remove that Water.
  • In Congested Reinforcements highly Workable Concrete is Needed and the Solution is Vacuum Concrete
  • If we are using the Normal Concrete with more water to cement ratio the compressive strength will diminished , So to Overcome that we have to use Vacuum Concrete.
What Types of Equipment are Used in Vacuum Concrete ?
Their are Lot of Equipment that are being used in the Procedure of making , placing and Finishing the Vacuum Concrete and are Listed as Follows :
  • A Special Kind of Formwork ( for Pre Cast )
  • Suction Pump
  • Vacuum Pump
  • Water Collection Tower
  • Muslin Cloth
  • Filter Mat
  • Suction Pad
  • Double Beam Screed Vibrator ( weighing 130 kg )
  • Power Floater and Trowel
What is the Procedure in using the Vacuum Concrete ?
In Every Construction Process , The main thing is follow the Procedure with Open Eyes and Never use your own Tricks to achieve a goal . So, The Following some Lines Explain the Whole Procedure in Batching , Mixing, Transporting , Placing , Compacting , Finishing as Well as the process of suction of water as follows :
  • First of All According to the Requirement of Workability , We have to Decide the Factor of w/c Ratio to be Increased and According to that All the quantities of Aggregates , cement , water as well as Admixtures need to be Added in the Batching Plant.
  • Keep in mind that we can only Remove water from the Concrete within 2 hours from the time we added water , So Transport the Concrete at Time According with that .
  • Before Placing make sure that All your vacuum team is Ready , Because After Placing we need to Hurry on All the Further Steps.
  • After Placing of vacuum concrete just quickly proceed for the Compaction using the Vibrating Needles .
  • After Compaction , Place the Suction Pad Over the Top Surface of Concrete and After the Cover Suction Pad with an Outer Membrane in Order to Create a Pressure Difference After Leaving a 4 inch Hole where we have Adjust the Suction Pipe , But Keep in mind that the At least One surface need to exposed to Atmosphere in Order to Create a Pressure Difference.
  • After Adjusting the Vacuum Suction Pump be ready to Turn On the Equipment and You can Notice that Water is Dropping inside the Water Collection Tower or you can Also take a Bucked If the Area is Small 
  • Now the main Step is Coming , After Removal of Suction Pad you will Notice some of the capillaries and Deformation on the Surface , So Setup the Masons with Power Trowel and Floater to Give Final Finishing to the Surface.
What are the Uses of Vacuum Concrete ?
Their are a Lot of uses of Vacuum Concrete which are Termed as Follows :
  • It is Used in Thin Slabs and Walls
  • It is Used in Pre Cast Concrete Elements
  • It is used to increase Workability of Concrete
  • It is used in Production of Pre Cast PCC
  • It is Used in Airport Pavements
  • It is used in Hydropower Plants
  • It is Used in Canals and Sloping Roofs
What are the Advantages of Vacuum Concrete ?
Following Some of Lines can Tell you About the Benefits of the Vacuum Concrete :
  • It saves the Cement used to Increase the Workability of Concrete
  • It Tends to Increase the Compressive and Tensile Strength of the Concrete
  • The Time to Achieve 28 Days Strength can be made to 10 Days by using Vacuum Concrete
  • The Permeability of Concrete is Minimized Now
  • The Bond Strength Between Steel Bar and Concrete can be Increased Up to 20% by using this Method.
  • If we have used Vacuum Concrete , The Formwork can be Removed Even Before the Initial Setting Time , But the Condition is that we have to do everything quickly.
  • If by Any chance it happens at site , that the Admixture used is highly dosed and due to that concrete became segregated and If we do everything nicely then this excess water can be removed smartly using the vacuum Method.
  • If we are Placing Vacuum Concrete Over Layer of some Old Concrete The the Bond Strength between the two surfaces will be greater than the Normal or Conventional Concrete.
  • The Upper Surface of Vacuum Concrete is More Resistant towards the Abrasive Effect than the Conventional Concrete .
What are the Disadvantages of Vacuum Concrete ?
You Know that if their is some benefit of a thing then it is must that their will also be some consequences of that and same thing is with the Vacuum Concrete and some of the losses of using Vacuum Concrete is enlisted as Follows :
  • A Highly Literate Labor as well as Supervisors are Required During the Placing , Compaction and Suction of Water as well as during the Finishing.
  • Some Expensive Equipment are needed in this kind of Concrete
  • High Amount of Power is Consumed during the Suction of Water
  • It takes Double the Time in Whole Process to Complete than the Conventional Concrete
  • Some Capillaries are Automatically Generated over the whole Layer of Concrete , which needed to be finished Properly
  • This Method is not made for water to cement ratio lesser or equal to 0.4
Wrap Up
So, I think each and every Part Related to Vacuum Concrete has been discussed in the Above Article . I Hope this Information helped you and If you have Any Queries then make sure to contact us through the Contact Form Below or You may Also Ask us in Comment Section .

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