What is a posttensioned slab in construction?

A post-tensioned slab is a reinforced concrete slab in which high-strength steel tendons are threaded through ducts and tensioned after the concrete has hardened, allowing thinner, longer-spanning slabs with reduced material usage.

How Post-Tensioning Works

• Steel tendons are placed within the concrete slab before pouring
• After concrete achieves sufficient strength, tendons are stressed and anchored
• Tensioning compresses the concrete, counteracting bending stresses

Structural Benefits

• Allows longer column-free spans than conventional reinforced concrete
• Enables thinner slab profiles reducing overall building height
• Reduces concrete and steel quantities compared to conventional slabs

Applications in Real Estate

• Widely used in commercial office buildings requiring open floor plans
• Popular in parking structures needing long, unobstructed spans
• Adopted in high-rise residential towers to optimize floor-to-floor heights

Post-tensioned slabs have become a preferred structural solution for commercial and high-rise residential projects, offering significant design flexibility and material efficiency that conventional reinforced concrete slabs cannot achieve.