THE HOLLOW-CORE SLAB (OR HOLLOW CORE PLANK OR VOIDED SLAB) IS A SPECIAL TYPE OF PRE-CAST ELEMENT MADE OF ONLY PRE-STRESSED CONCRETE WITH CAVITIES TO MAKE IT LIGHTER.
The lightening effect is obtained by creating in the pre-cast element thickness some longitudinal cavities of suitable sizes, in order to create ribs that, together with the slabs of extrados and intrados, constitute the concrete section to be pre-stressed by the “adhering strands” system.
The system of pre-cast elements is much used in the pre-casting business line. As a matter of fact all national regulations in this field do dedicate one section as a minimum to this system. That’s why the hollow-core slab can be defined as the most international among the pre-cast concrete components in the field of the building industrialization worldwide.
The hollow-core slab is produced as an unbroken element with specific moulding machines.