New type of slab system

1. BUBBLE DECK SLAB

2. CONTENTS
 Introduction
 Materials
 Advantages
 Experimental Study
 Scope of Future
 Conclusion

3. 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

4.  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

5. 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.

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

7. 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..

8. 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

9. ADVANTAGES
Construction
Light in weight less equipment is required
Easy incorporation of ducts and pipes into slab
Less work on construction site
Engineering
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

10. 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

11. 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

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

13. 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

14. CONCLUSION
Obviously this intellectual slab design may
become the future of slab construction
which gives a tremendous contribution in
Sustainable development

15. THANK YOU
For your attention