Mukkara Raviteja4th semi ,civil engineering

Madanapalle Institute of

Technology and Science(MITS)

BUBBLE DECK SLAB

CONTENTS

Introduction

Materials

Advantages

Experimental Study

Scope of Future

Conclusion

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

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

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.

WHY BUBBLE DECK SLAB ?

Flat slab technology

(no need of beams )

Longer spans

Pre fabricated

&

cast in-situ

No compromise for

strength& serviceability

MATERIALS

PLASTIC SPHERES hollow spheres madefrom 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 of¾ inch.

STEEL –The steel

reinforcement is of MS or HYSD can be used..

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

required15 m

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

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

EVERY 5000M2 OF BUBBLE DECK

FLOOR SLAB CAN SAVE

1)1,000 m3 site concrete

2)166 ready mix lorry trips

3)1,745 GT energy used in concrete production

4)1,798 tonner of foundation loads or a less piles

5)270 tones of co2 green house gases emissions

SOLID SLAB VS. BUBBLE DESK SLAB

SOLID SLAB VS. BUBBLE DESK SLAB

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

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

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

CONCLUSION

Obviously this intellectual slab design may become the future of slab construction which gives a tremendous contribution in

Sustainable development

THANK YOU

For your attention

Bubble deck slab system Mukkara.Raviteja

Department of civil Engineering

Madanapalle instruction of technology and science (MITS)

ABSTRACT

Bubble Deck is a revolutionary method of virtually eliminating

concrete from the middle of conventional slab which does not perform

any structural function, thereby dramatically reducing structural dead

weight by linking air and steel directly. Bubble Deck slab uses hollow

spherical or elliptical balls made by recycled plastic. A Bubble Deck

slab has a two-dimensional arrangement of voids within the slabs to

reduce self-weight. The behavior of Bubble Deck slabs is influenced by

the ratio of bubble diameter to slab thickness. This new prefabricated

construction technology is recently applied in many industrial projects

in the world. This shows the effectiveness and feasibility of the

application of Bubble Deck in the construction. Voids in the middle of a

flat slab eliminate 35% of a slab’s self-weight removing constraints of

high dead loads and short spans. Combination of recycled plastic

bubbles permits 50% longer spans between columns without any

beams. This provides a wide range of cost and construction benefits.

Usually the Bubble Deck system combines the benefits of factory-

manufactured elements in controlled conditions along with on-site

completion with the final monolithic concrete, resulting in a completed

floor slab. This paper presents a study on the properties and

advantages of Bubble Deck slab system

Key points In

Bubble Deck Slab

System

1)Preserves 30 to 50 %

weight than a

equivalent solid slab –

equal stiffness.

2)20% concrete

lessening in other

components.

3)The decreased weight

of the slab will lead to a

modification in design to

longer spans and/or

condensed deck

thickness.

4)It can be easily used

with seismic as it

minimizes the total

weight of the building.

5)Minimize concrete

usage – 1 kg recycled

plastic substitutes 100

kg of concrete.

6)With this system the

cost of the building is

decreased by 8 to 10 %.

SLAB

TYPE IN

BD

THICKNE

SS OF

SLABS IN

MASS

KG/sqm

BD280 280 450

BD340 340 550

BD390 390 640

BD450 450 730

Volume of solid slab = 1x1x0.23 = 0.23 m3. Volume of air

voids = 25 no 180mm diameter balls per m 2. Volume of

sphere is diameter3 x 0.5236. Therefore volume of each ball is (0.18x0.18x0.18) x 0.5236 = 0.0030536 m3 x 25no. per m2 =

0.07634 m3. Net volume of 230mm thick Bubble Deck slab is

therefore 0.23 m3, minus 0.07634 m3 = 0.15366 m3. Mass of 230mm thick Bubble Deck slab is therefore 0.15366 m3 x

2400 kg/m2 (Weight of concrete with 2% reinforcement) =

368.8 kg/m2

What is the principle behind?

1)The area between columns of a solid slab has

limited structural effect beyond adding weight

2)Replacing that area with area with a grid of “voids

sandwiched between layers of reinforcing welded

wire steel and an internal lattice girder yields a slab

typically 35%.lightly that performs like solid

reinforcement concrete

Moment strength and

span

Thermal resistance

Every 5000m2 of bubble deck floor slab can

save:

1)1,000 m3 site concrete

2)166 ready mix lorry trips

3)1,745 GT energy used in concrete production

4)1,798 tonner of foundation loads or a less piles

5)270 tones of co2 green house gases emissions

Scope of future

use1)Used for

constructing all

types of building

especially sky

scrapers

2)Best for larger

span halls like

theatres and

auditoriums

3Pedestrian bridge

decks

4)Used in parking

areas as less

number of columns

are required

Conclusion

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

Reference

1)www.bubbledeck.com

2) IEEE-International

Conference On Advances In

Engineering, Science And

Management (ICAESM -2012)

March 30, 31, 2012