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Prestressed hollow core slabs are designed as simply supported pretensioned ribbed slabs, in accordance with the requirements of SABS 0100-l or the appropriate National Code.

HOLLOW CORE SLABS – 120mm | 150mm | 200mm | 250mm

Cores are typically either circular or elliptical. Slabs may be reinforced or prestressed and are designed as ribbed slabs.

The hollow cores afford a reduction in self-weight of 30% or more, compared with a solid slab of the same depth. For most applications, no propping is necessary during construction, but crane access is essential.

Alternative methods of casting slabs are:

  • Cast in conventional moulds with coreformers cast-in or removed.
  • Cast on a long prestressing line being extrusion slipform methods.

The cast-in-mould method is used for reinforced concrete and longitudinal cantilever reinforcement may be incorporated if required.

The extrusion or slipform methods are suitable for a pretensioned prestressed long-line system of manufacture, without transverse or shear steel.

Manufacturing beds are typically 100 – 150 m long and the slab is sawn to required lengths before lifting. The longitudinal edges of the precast units are designed and profiled to receive grout in the joints and create a shear interlock which provides load transfer and prevents differential deflection.

The top surface is generally prepared to receive a screed or structural topping. Because they are cast against a steel surface, the soffits are smooth and ready to receive a decorating finish direct without the need for plastering.

Reinforced hollow core slabs are designed as simply supported ribbed slabs in the conventional manner. However they are more versatile than the prestressed slab, since longitudinal top reinforcement can be cast-in for cantilever action.

Prestressed hollow core slabs are designed as simply supported pretensioned ribbed slabs, in accordance with the requirements of SABS 0100-l or the appropriate National Code. The prestressing force opposes the tendency to downward deflection and causes an upward camber in the units under no-load conditions.

Hence, together with the high-strength concrete employed, larger span/depth ratios can be achieved than with reinforced concrete.

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