Post-tensioning is a technique to reinforce concrete. It makes it stronger and more flexible compared to conventional steel-reinforced concrete. Steel cables inside plastic sleeves are positioned in the form, then the concrete is cast. After the concrete has gained the required strength, the cables are tensioned and anchored against the outer edges. Here, the timing for the stressing is essential to ensure great product quality. The post-tensioned concrete can be thinner and longer compared to conventional concrete slabs without any risk of cracking as the embedded cables help to stabilize.
The specific technique is commonly used for large commercial or industrial projects as extra equipment and skills are required. The additional costs for the post-tensioning are however outreached with cutting down material costs as less reinforcing material is needed.