To the civil Engineers, Builders in the forum.
Base on my pictures below, A friend of mine sent me this pic asking me what type of slab it is. And where can it be use, the reason of putting the waffles ball in between the reinforcement. To cut the story short, an explanation on the slab. I believe you will help me out with these.

It is called a bubble deck or bubble slab....

It makes floors thinner and reduces concrete weight.
This type of slab is believed to save cost because the amount of concrete needed is a lot more less than the normal heavy all concrete slabs.

The areas between columns in a solid slab more or less have limited structural effect beyond adding extra weight to the structure, so those blue balls you see are placed between layers of reinforced welded steel and an internal lattice girder which when casted produces a slab that is 35% lighter...

Cheers.

Ebubeslym:
It is called a bubble deck or bubble slab....

It makes floors thinner and reduces concrete weight.
This type of slab is believed to save cost because the amount of concrete needed is a lot more less than the normal heavy all concrete slabs.

The areas between columns in a solid slab more or less have limited structural effect beyond adding extra weight to the structure, so those blue balls you see are placed between layers of reinforced welded steel and an internal lattice girder which when casted produces a slab that is 35% lighter...

Cheers.

Thank u,........ Am very greatful

I need more more explanation......... Will b glad to have more

.

The above explanations covered the idea for its use. I will not recommend it in Nigeria because the method requires close supervision and clear structural mathematical calculation. Less me just say there is less room for mistake when building such deck. The iron used has to be the right Fy and the concrete right Fc as well. Concrete characteristic is compression strength, while iron's is tension. Tension is experience in the bottom of a slab while compression is exact on the top section of a slab. if the bottom section does not deform excessively, then the concrete at the bottom area of a slab do not serve much engineering purpose other then composition for the iron rod. Anyways, i have to stop here before i loss non-engineering NL

A similar application is the use of rigid foam panels. Use of the panels help to reduce the amount of concrete needed and weight of the slab as @Ebubeslym has pointed out, among other benefits.

I've been researching it to reduce costs for my upcoming build, but it seems to be rather expensive since the panels will have to be imported.

I don't know too, am waiting for answer too.

HOLAROCKDAY:
I need more more explanation......... Will b glad to have more

two people v explained before.
its done to reduce amount of concrete

Please, stop posting such because i don't know when We may get there

Safemode:
two people v explained before.
its done to reduce amount of concrete

Abi oooo

Ah?

EVILFOREST:
Please, stop posting such because i don't know when We may get there

Your moniker already state where you belong. Don't you see black workers there

Mehn this guys are soooo creative #Awesome mehn

cool

EVILFOREST:
Please, stop posting such because i don't know when We may get there

Rather shallow.

Infos like this need to be shared.

Who knows, you might be among those that will get us there.

Ebubeslym:
It is called a bubble deck or bubble slab....

It makes floors thinner and reduces concrete weight.
This type of slab is believed to save cost because the amount of concrete needed is a lot more less than the normal heavy all concrete slabs.

The areas between columns in a solid slab more or less have limited structural effect beyond adding extra weight to the structure, so those blue balls you see are placed between layers of reinforced welded steel and an internal lattice girder which when casted produces a slab that is 35% lighter...

Cheers.

you seem experienced, can we be friends?, I want to know more

A

It's waffle, bubble or hollow deck/slab
As said above, it's to reduce weight, especially in multi storey buildings.

It's common in Nigeria, I sighted first about 13 yrs ago when joined the construction industry.

wow

A company in Abuja called Cubic Homes already manufactures the polystyrene blocks. No need to import
...

msogunro:
A similar application is the use of rigid foam panels. Use of the panels help to reduce the amount of concrete needed and weight of the slab as @Ebubeslym has pointed out, among other benefits.

I've been researching it to reduce costs for my upcoming build, but it seems to be rather expensive since the panels will have to be imported.

Its serves so many purposes!

* Reduces the amount of Concrete required in the General Slab (save cost).

* Helps in reducing the Effect of the Concrete on the structure in General.

* Serves as a sound prove!

* Helps reduces the effect of heat the concrete is to emit in a hot region! Like the Northern part where their Sun is hot like Hell!.


That's few amongs the ones I know!

Good Morning Nairalanders #Seuncoded

easy answer =bubble slab and to save concrete money,BUT to try this in water lodged area

who u epp? Who u epp? Who u epp? U don baFf? Who u serve don't slam my door what is wrong with you

Ebubeslym:
It is called a bubble deck or bubble slab....

It makes floors thinner and reduces concrete weight.
This type of slab is believed to save cost because the amount of concrete needed is a lot more less than the normal heavy all concrete slabs.

The areas between columns in a solid slab more or less have limited structural effect beyond adding extra weight to the structure, so those blue balls you see are placed between layers of reinforced welded steel and an internal lattice girder which when casted produces a slab that is 35% lighter...
Cheers.

Bros ur School fees no waste.....

educative...

As someone has rightly pointed, it reduces the volume of concrete, it sound proofs, temperature regulation due to the void in the concrete. It is worth to know that this type of slabs are very expensive and they use more reinforcement compared to flat slab. Hollow bricks can be used as well and the result is fantastic! Here is one I supervised. (Waffle slab or I call it insulated ribbed slab)

Hollow concrete slab

It increases the head room in floor by eliminating drop beams in slabs.


modified one of the site am currently working on.