Powerpoint Presentation

1. BUBBLE DECK SLAB
SEMINAR
PRESENTATION ON
PRESENT BY:
SABER KHURESHI
GUIDED BY:
Mrs.SHARMISHTH
A CHAKRABORTY
DEPARTMENT OF CIVIL ENGINEERING

2. CONTENTS
• Materials
• Construction
• Effects
• Advantages
• Experimental Study
• Scope of Future
• Conclusion

3. OBJECTIVE
• To improve the construction technique.
• To reduce the self weight of slab and also reduce the quantity of slab,To
achieve the main factor of construction which is economic.
• Low material as compared to conventional slab material.

4. INTRODUCTION
• The Bubble Deck system is based upon the patented integration
technique - the direct way of linking air and steel.
• The Bubble Deck is a two-way hollow deck in which plastic balls serves
the purpose of eliminating concrete that has no carrying effect.
• By adapting the geometry of the ball and the mesh width, an optimized
concrete construction is obtained, with simultaneous maximum utility
of both moment and shear zones.

5. BACKGROUND
Compression
zone
Tensile zone
Central portion of RCC solid slab
(simply supported)
Problems with inactive concrete:
additional weight,
span limitations,
material wastage,
energy consumption

6.  Pre fabricated one way spanning concrete elements with
hollow cylinders, replacing inactive concrete
HOLLOW CORE SLABS
Problems:
Strength in one direction only
Inflexibility
Reduced architectural possibilities
Lack of structural integrity

7. BUBBLE DECK SLAB
The best solution for above two problems is Bubble Deck Slab
Bubble Deck Slab is a Biaxial voided concrete slab in which high density
polythene hollow spheres replace the ineffective concrete in the centre
of concrete slab.

8. WHY BUBBLE DECK SLAB ?
Flat slab technology
(no need of beams )
Longer spans
Pre fabricated
&
cast in-situ
No compromise for strength&
serviceability

9. MATERIALS
PLASTIC SPHERES
hollow spheres made
from recycled high density
polyethylene
• Enough strength &
rigidity
• Not porous
• Doesn’t react
chemically with
concrete or steel
CONCRETE-the concrete is made of
standard Portland cement with max
aggregate size of
¾ inch.
STEEL –The steel
reinforcement is of MS or
HYSD can be used..

10. CONSTRUCTION
-The minimum distance between gaps is 1/9 of the gap diameter.
- The total height of the BubbleDeck slab elements is constant
-Bubble Deck slab elements are plates with ribs on two directions
made of reinforced concrete .
-These slab elements have a bottom and an upper concrete part
connected with vertical ribs that go around the gaps.
-First constuct bottom concrete part and then upper concrete part.

11. EFFECTS-
The basic effect of the bubbles is the weight reduction of the deck. The
dead load of the BubbleDeck is 1/3 lesser than a solid deck with the
same thickness – and that without effecting the bending strength and
the deflection behavior of the deck.
A BubbleDeck has twice the capacity with 65% concrete and the same
capacity with 50% concrete compared with a solid deck.

12. SOUND-
A comparison was made between BubbleDeck and one-way
prefabricated hollow deck of similar height. The noice reduction with
BubbleDeck was 1 db higher than the one-way prefabricated hollow
deck. The main criteria for reducing noice is the weight of the deck and
therefore BubbleDeck will act better than other deck types with equal
weigth.

13. ADVANTAGES
Structural
• Less weight
• Increased strength
• No need of beams
• Only few columns required
• Larger span
• Free choice of Shape
• Less foundation depth
• Less excavation
required
15 m

14. ADVANTAGES
Construction
• Easy incorporation of ducts and pipes into slab
• Less work on construction site
• Light in weight less equipment is required
• The biaxial flat slab system and columns are ideal for structures with
high resistance against Explosions
• These slabs and column system acts as an elastic membrane which
transfer horizontal forces to stiff vertical structures which is used for
Earthquake resistant designs

15. ADVANTAGES
Environment
• Less material and energy consumption
• Reducing CO2 emission up to 40 kg/m2
• 1kg of plastic replaces 100kg of concrete
• Every component can be recycled
• Economy
• Savings in materials
• Transportation costs reduced
• Faster construction time
• Buildings can be more flexible and easy in installations

16. SIGNIFICANCE
• Bubble deck slab is saving a 30% to 40% of the material consumption in
the floor material.
• It helps to reduce structural dead weight .
• This type of structure can also useful to reduce earthquake damage.
• Flat slab technology (no need of beams).
• Longer spans.
• No compromise for strength and serviceability.
• Prefabricated and cast in-situ.
• Fast construction.
• Economical.

17. EXPERIMENTAL STUDIES
1.Shear strength- 80% of solid deck slab
2.Deflections - same as solid deck
3.Weight - 40% less than a solid slab
4.Fire resistance - 65% of solid slab

18. MILLENNIUM TOWER
(ROTTERDAM)
First high rise building
erected with Bubble Deck
Height of the building is 131 m
Second Highest building in
Netherlands
34 stores were constructed
CASE STUDY

19. SCOPE OF FUTURE USE
• Used for constructing all types of building especially sky scrapers
• Best for larger span halls like theatres and auditoriums
• Pedestrian bridge decks
• Used in parking areas as less number of columns are required

20. CONCLUSION
Obviously this intellectual slab design may become the
future of slab construction which gives a tremendous
contribution inSustainable development

21. THANK YOU
For your attention