A concrete slab is a common structural element of modern buildings. Floors and ceilings are often constructed with horizontal slabs of steel reinforced concrete.
In situ concrete slabs are built using formwork where the wet concrete is poured. If the slab is to be reinforced, the rebars are positioned within the formwork and held away from the bottom and sides of the formwork by using plastic tipped metal or plastic bar chairs. After that, the concrete is poured in.
Steel reinforcing is usually placed in the slab at both top and bottom edges. However, it is the bottom reinforcement that is doing all the work, as the top layer is primarily used to control concrete shrinkage cracks.
After the concrete has been placed, it needs to be cured. This is achieved by spraying or ponding the concrete surface with water, thereby protecting the concrete mass from ill effects of ambient conditions.
Finally, once concrete is cured and gains enough strength, the formwork can be removed.
Formwork. Concrete poured in. Concrete being cured.
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