A ppt on vaccum concrete

1. A Seminar 0n
VACUUM CONCRETE
Presented By :
Ng.Joshibanta
6th Sem, 141018
BACHELOR OF ENGINEERING
IN
CIVIL ENGINEEERING
2016-2017

2. Contents
Introduction
Need for vacuum concrete
Equipment's
Application’s
Advantages
Disadvantages
Conclusion

3. INTRODUCTION
• Vacuum concrete is the type of concrete in which the excess water is removed for
improving concrete strength
• It was first invented by Billner in United states in 1935.
• Reducing the final water-cement ratio of concrete before setting, to control
strength and other properties of concrete.

4. Need for vacuum concrete
• The chemical reaction of cement with water requires a water-cement
ratio of less than 0.38.
• But it is always taken more than 0.38.
• Workability is also important for concrete.
• Workability and high strength don’t go together as their requirements
are contradictory to each other.
• Vacuum concrete is the effective technique used to overcome this
contradiction of opposite requirements of workability and high
strength.

5. Equipment's use in Vacuum Concrete
Vacuum pump with hose pipe

6. Water separator

7. Filtering pad

8. Screed board vibrator

9. Power floater

10. Power trowel

11. Procedure
• With the help of screed vibrator the surface is vibrated.
• Vacuum pump is a small but strong pump of 5 to 10 HP.
• The mats are placed over fine filter pads.
• Water from concrete is vacuum and stored in water separator.
• About 3% reduction in concrete layer depth takes place.
• By the use of power trowel and power floater the surface is given a
hard and smooth finish.

12. Fig : Vacuum concrete process

13. Applications of Vacuum Concrete:
• Industrials floor sheds like cold storages
• Hydro power plants
• Bridges ports and harbour
• Cooling towers

14. Advantages of Vacuum Concrete
• Increase of final strength of concrete by about 25%
• Sufficient decrease in permeability of concrete
• High density concrete
• Increase of about 20% bond strength of concrete
• Appreciable reduction of time for final finishing
• Early removal of wall forms
• Increase in durability.

15. Disadvantages of Vacuum Concrete
• High initial cost.
• Need trained labor.
• Need specific equipment.
• Need power consumption.
• The porosity of the concrete allows water, oil and grease to seep
through, consequently weakening the concrete.

16. Conclusion
• Good quality of floors and pavements can be obtained.
• The compressive Strength can be increased by 25-45%.
• Durability of the floor can be increased.
• 15-25% of water can be extracted out.

17. Reference
• A text Book of Engineering Materials by Dr. M.A. Aziz
• Construction of a rigid pavement with vacuum dewatering Indian
concrete journal volume 71 – page 13
• Dahl G., (1975), "Vacuum concrete", CBI Reports, 7: 75, Part 1, 10 pp.
(Swedish Cement and Concrete Research Inst.,).
• Vacuum dewatering system/tremix method from Aquarius
Technologies Private Limited,india www.aquariustech.net

18. THANK
YOU