Hollowcore 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, maximising
structural efficiency. The cores also have a benefit in
sustainability terms in reducing the volume of material used. Units
are generally available in standard 1200mm widths and in depths
from 110mm to 400mm. There is total freedom in length of units and
splays and notches can readily be accommodated.
Hollowcore slabs have excellent span capabilities, achieving a
capacity of 2.5 kN/m2 over a 16m span. The long-span capability is
ideal for offices, retail or car park developments. Units are
installed with or without a structural screed, depending on
requirements. Slabs arrive on-site with a smooth pre-finished
soffit. In car parks and other open structures, pre-finished
soffits offer a maintenance free solution.
Prestressed units will have an upward camber dependent upon the
span, level of prestress, etc. This will be reduced when
screeds/toppings or other dead loads are applied.
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Precast Concrete in Buildings