Suspended Concrete Floor Slab Thickness

How thick is the concrete on the floors of a multi story building.

Suspended concrete floor slab thickness. Concrete slab on ground floor systems and suspended floors suitable for residential buildings ranging from single detached houses to medium density buildings of apartments and flats. For slabs 12 in. Traditionally column spacings and floor spans in these buildings have been in the range of 6 to 9 metres to both contain costs and simplify construction. Slab thickness is a major factor in the cost of a concrete floor so there s often pressure which can become intense to make the slab as thin as possible.

If the suspended slab is expected to conform to aci 117 10 specification for tolerances for concrete construction and materials there are only a few relevant tolerances. It is used in the construction of multistory buildings. Concrete for household works such as driveways or floors is typically in the range of 1 800 psi to 4 000 psi for compressive strength. This type of concrete slab construction requires different concrete slab design from the one we normally see that is cast on the ground.

Type of lightweight floor system is constructed by pouring lightweight aggregate concrete into the fixed forms of the concrete slab. Section 4 4 1 indicates that deviation from the specified elevation is 3 4 inch but that s only applicable on formed suspended slabs before the removal of shores. The most common application of suspended slab in residential construction is used at garage floor where below the garage floor is a storage. However recently there is a preference for large floor areas with column free space and spans.

It depends on how it is constructed. Some multi story buildings use pan formed slabs so the slab is structural and supports its own weight after the forms and shoring are removed. Concrete has inherent compressive strength resistance to forces pushing on it. Concrete mixes are designed to a specified compressive strength expressed as pounds per square inch psi.

For slab on ground floors it provides an understanding of the footing slab selection design detailing and construction requirements contained in as 2870 and. Aci 117 90 standard specifications for tolerances for concrete construction and materials gives only two tolerances for these appli cations. Many design methods are available and superficially they can seem quite different. The minimum thickness of lightweight concrete floor system can be computed based on the specifications of american concrete institute aci 318 14.