Hollow core ribbed Slab or Hollow core slab

Hollow core ribbed Slab or Hollow core slab

Hollow core ribbed slabs derive their name from the voids or cores which run through the units. The cores can function as service ducts and significantly reduce the self-weight of the slabs, maximizing structural efficiency. The cores also have a benefit in sustainability terms in reducing the volume of concrete used. Units are generally available in standard 1200 mm widths and in depths from 110mm to 400 mm. There is total freedom in length of units. These type of slabs are Pre casted and it is used where the construction has to be done fast.

The hollow core ribbed slabs have between four and six longitudinal cores running through them, the primary purpose of the cores being to decrease the weight, and material within the floor, yet maintain maximal strength. To further increase the strength, the slabs are reinforced with 12mm diameter steel strand, running longitudinally. This is one of the types of concrete slabs.

Hollow core slab Advantages :

uHollow core ribbed slab not only reduces building costs it also reduce the overall weight of the structure.

uExcellent fire resistance and sound insulation are another attributes of hollow core slab due to its thickness.

uIt eliminates the need to drill in slabs for electrical and plumbing units.

uEasy to install and requires less labor.

uFast in construction.

uNo additional formwork or any special construction machinery is required for reinforcing the hollow block masonry.

Hollow core slab Disadvantages:

uIf not properly handled, the hollow core ribbed slab units may be damaged during transport.

uIt becomes difficult to produce satisfactory connections between the precast members.

uIt is necessary to arrange for special equipment for lifting and moving of the precast units.

uNot economic for small spans.

uDifficult to repair and strengthen.