Precast Concrete Hollow Core Slab Manufacturer
Hollow Core Slab
Hollow core slabs are prestressed concrete elements that have a constant cross section. They are manufactured using high tensile strength prestressed strands or single wire which are embedded within the element. Hollow core slabs can be used with different supporting structures: concrete constructed walls, brick-built walls, steel structures, on-site concrete cast structures, prefabricated beams etc.
The span achievable depends on the thickness of the slab. Due to pre-stressing, the hollow core slab can span up to 23 m, easily in the range of 5.0 to 10.0 m for typical buildings. It can also be used as a roof or a wall element. Fire resistance of 60 to 120 minutes but can be extended to 240 minutes
- Thickness: 100mm, 150mm, 200mm, 250mm and 350mm
The production of these elements is achieved using an Extruder and stressor machines that cast in one phase along a production bed without the need for any formworks.
Concrete is delivered from the main hopper by feeding tables into delivery hoppers mounted on the forming insert. From here the concrete is delivered to the production bed and the voids are formed by a set of forming tubes. Special vibrating groups provide a vibration process ensuring excellent levelling.
At every stage meticulous testing is done to maintain quality. Every concrete batch undergoes cube testing to ensure strength parameters are met along with slump testing to ensure consistence in the mix design. After demoulding the product goes through visual inspection to ensure no honey-combing, voids or cracks are present. In case any test fails the batch will be rejected.
Hollow core slabs are widely used for flooring and wall panels in industrial, commercial, residential and infrastructure construction. Hollow core slabs can be used with different supporting structures: concrete constructed walls, brick-built walls, steel structures, on-site concrete cast structures, prefabricated beams etc.