Difference Between PT Slab & Normal Slab

Difference Between PT Slab & Normal Slab(Conventional)
Difference Between Post Tension Slab & Normal Slab(Conventional)

ØNormal slab is reinforced concrete(RCC) structural element whereas post-tension slab is per-stressed concrete (PSC) structure.

ØThe slab which is supported with Beams and columns is called conventional slab. In this kind of slab, the thickness of the slab is small whereas the depth of beam is large and the load is transferred to beams and from beams to columns.

ØThe slab which is tensioned after constructing slab is called Post tension slab. Reinforcement is provided to resist the compression. In Post tension slab the reinforcement is replaced with cables/ steel tendons.

ØIt requires more formwork when compared with the flat slab. and there is no need of providing column caps in the conventional slab.

ØThese types of slabs are used in constructing floors of multi-storeyed building.

ØBased on length and breadth of Conventional Slab is classified into two types:

•One-Way Slab

•Two-Way Slab

ØPost-tensioning provides a means to overcome the natural weakness of concrete in tension and to make better use of its strength in compression.

ØIn concrete structures, this is achieved by placing high-tensile steel tendons/cables in the element before casting When the concrete reaches the desired strength the tendons are pulled by special hydraulic jacks and held in tension using specially designed anchorages fixed at each end of the tendon This provides compression at the edge of the structural member that increases the strength of the concrete for resisting tension stresses.