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What is a suspended concrete slab?

What is a suspended concrete slab?

Suspended slabs are slabs that are not in direct contact with the ground. They form roofs or floors above ground level. Suspended slabs are grouped into two types: one way slabs which are supported on two sides. two way slabs which are supported on all four sides.

What are the types of slabs?

Concrete Slab Types – Construction, Cost, and Applications

  • One-Way Slabs on Beams.
  • One-way joist slab (Ribbed slab)
  • Waffle Slab (Grid slab)
  • Flat Plates.
  • Flat Slabs.
  • Two-way Slabs on Beams.
  • Hollow core slab.
  • Hardy Slab.

What is suspended Foundation?

A suspended slab is provided spaced apart from a ground surface by a void using evacuation rather than lifting. Structural supports are provided extending upward from the ground surface to a desired height. A temporary removable material is placed on top of the ground and extend upward to the desired height.

How do you support a suspended slab?

Because the slab will bend in different ways depending on how many support walls it has, the main steel reinforcement has to be placed in different areas to even out the tension. A slab supported by two walls will tend to fold in the middle, so rebar placed parallel to the short span will provide maximum support.

How does a suspended slab work?

Precast concrete suspended slabs are constructed off site and later are craned into the construction site. This type uses precast concrete panels or planks spanning only in one direction. The concrete is poured after the reinforcement is placed in reusable and adjustable moulds.

What is the difference between a solid and suspended ground floor?

Solid floors are a lot more substantial and require the ground to be made up in layers of ground sub base, sand, compacted hard core, damp proof membrane, insulation and concrete. Suspended floors are normally made up of 2 materials, either timber joists or a concrete beam system.

What is a casting slab?

Cast-in-place concrete is a technology of construction of buildings where walls and slabs of the buildings are cast at the site in the formwork. It uses concrete slabs for walls instead of bricks or wooden panels, and formwork is used for both walls and roof.

Why are concrete floors suspended?

Unlike standard ground floor construction, suspended floors are not sitting directly on the ground. This allows air flow and ventilation to prevent the mould and dry rot that would otherwise occur over damp ground. However this air flow can leave the problem of draughts and cold in the house if not insulated correctly.

What are the advantages of a suspended floor?

Is there such a thing as a suspended concrete slab?

Suspended concrete slab is referred to a cement slab that is not in contact with the ground. This type of concrete slab construction requires different concrete slab design from the one we normally see that is cast on the ground.

How much does a 6 inch suspended slab weigh?

The 6 inch suspended slab in detail 21 weighs 75 pounds per square foot but the formwork should be designed to carry 130-150 psf due to the weight of workers and equipment used during pour. That is why concrete formwork for suspended slab has a lot more columns and beams compared to the normal residential floor framing.

How many joists do you need for a suspended slab?

That is why concrete formwork for suspended slab has a lot more columns and beams compared to the normal residential floor framing. To buy the material for forming plan of using 2x10s for beams at every 5 feet and use 2x6s as joists at every 24 inches.

How are precast in situ suspended slabs built?

Precast suspended slabs are constructed by pouring the slab in a formwork on the ground and then lifting the slab into its suspended position in the structure. Cast in-situ slabs use temporary works comprising formwork supported by falsework as follows: Temporary struts and beams are installed below the slab position.