Post Tensioning

What is post tensioning?

Post-tensioning is a construction technique to reinforce concrete structures, such as beams and slabs. It involves the application of tension to steel cables or tendons after the concrete has been cast and cured.

The process typically involves placing ducts or sleeves within the concrete formwork before pouring the concrete. High-strength steel cables or tendons are inserted through these ducts. The ends of the tendons are then anchored to the structure using specialized anchorages.

After concrete pouring and hardening, hydraulic jacks apply tension to tendons. This tensioning process helps to compress the concrete and create a pre-stressed state in which the tendons exert a pulling force on the structure. The level of tension applied is calculated based on design requirements and structural analysis.

Post-tensioning offers several advantages over traditional reinforcement methods. It allows for longer spans between supports, reduces cracking in concrete elements, increases load-carrying capacity, and improves overall structural performance. Additionally, it enables more efficient use of materials by reducing the amount of steel required.

Overall, post-tensioning is widely used in various construction projects such as bridges, parking structures, high-rise buildings, and industrial facilities to enhance structural strength and durability.

There are several advantages of post-tensioned slabs compared to conventional reinforced concrete slabs:

Improved crack control

The post-tensioning tendons help to distribute the load more evenly across the slab, reducing the occurrence and width of cracks that may develop over time.

Reduced structural depth

post-tensioning allows for thinner slabs, leading to overall cost savings by reducing the amount of concrete and reinforcing steel required.

Increased span length

⠀
Post-tensioned slabs can span longer distances without additional columns or supports, allowing for more open and flexible floor plans in buildings.

Cost-effective long-term maintenance

Due to their improved crack control and durability, post-tensioned slabs generally require less maintenance during their lifespan

Increased load-carrying capacity

Post-tensioned slabs have higher resistance, allowing for heavier loads or increased design flexibility.

Enhanced durability

The post-tensioning system helps to protect the slab from shrinkage and temperature-related movements, which can lead to cracking and deterioration over time.

Faster construction

The post-tensioning system helps to protect the slab from shrinkage and temperature-related movements, which can lead to cracking and deterioration over time.

Design flexibility

Post-tensioned slabs offer greater design flexibility as they can accommodate irregular shapes, curved layouts, or unique architectural features

Overall, post-tensioned slabs provide structural efficiency, cost savings, improved performance, and design flexibility compared to traditional reinforced concrete slabs.