Civil Engineering Reference
In-Depth Information
Post tensioned floor - technology note
Post tensioning is a method of reinforcing concrete with high strength steel bars. In
building, construction post tensioning allows longer clear spans and thinner floor
slabs and allows a significant reduction in the weight of the floor beams.
The tendons are kept in a permanently stressed state which creates a compressive
force to act on the concrete. This considerably increases the load carrying capacity of
the concrete.
On completion of applying the load to the tendons the duct is filled with a cemen-
titious grout that provides a corrosive protection to the tendons.
Post tensioning tendons shown in position
at each troughed beam
Floor slab poured in two 100 cm pours
Anchorages points on surface slab.
Anchorage consists of iron casting and
wedge system which grips the wire strand
View on underside of floor slab showing
prestressed troughed beams
