Post-tensioning is a method of reinforcing concrete by stretching steel tendons routed through plastic or metal ducts inside the slab. Once the concrete reaches a specified compressive strength, hydraulic jacks pull the tendons tight and anchor them against the edges of the slab. This compresses the concrete, giving it immense strength to span long distances without sagging or cracking.
We need the cylinder breaks to hit 3000 psi before the crew can post-tension the second floor deck.
Also heard as
- PT
- Posttension
Related terms
Tendon
The steel strand assembly in post-tensioned concrete that is pulled tight to precompress the member.
PT
Post-tensioning: reinforcing concrete with steel tendons that are stretched tight after the concrete hardens.
Prestress
To introduce internal compression into concrete before it is subjected to structural loads.
Pretension
To stretch steel reinforcement cables before the concrete is poured around them.
Compressive strength
The crushing load concrete can carry per unit area, the main property specified and tested for concrete.