Post- Tension (concrete) Slab

In the 1960s, with the development of higher strength steel

, better attachment hardware, better construction techniques, and simplified design methods, the use of post tension to reinforce structures became more popular. Post-tensioning enabled the lifting weight to be reduced and the deflection and the cracking performance to be improved. The first post tensioned slabs were erected in the USA in 1955, which already used unbonded post tensioning. To date, in the USA alone, more than 50 million m2 of slabs have been post tensioned. In Europe renewed interest in this form of construction was again exhibited in the early 70s.

A post-tension (CONCRETE) slab is a slab of concrete that has been Prestressed concrete using a specific method to increase the strength of the concrete. Post-tensioning is a method of strengthening concrete using high-strength steel strands or cables, typically referred to as Tendons. Slabs using the post-tension method can be built thinner, which can cut down on construction costs and curing time. The concrete component is cast with steel reinforcing strands installed in a way that protects them from bonding with the concrete. This practice gives designers the flexibility to further optimize material use by creating thinner concrete members.

The materials used to post-tension concrete members are ultra-high-strength steel strands and bars. Post-tensioning can help create innovative concrete components that are thinner, longer, and stronger than ever before. This method of pre-stressing concrete is especially useful in areas where the soil expands and contracts relative to weather conditions. More interesting and creative structures can be used in event stadium, ball parks and high-rise residential places. Even parking garages can be made stronger, more functional, and less expensive. By employing post-tension concrete construction methods, home builders can deliver a superior product at reduced costs.

Benefits and Advantages:

By comparison with reinforced concrete, a considerable saving in concrete and steel are possible since, due to the working of the entire concrete cross-section more slender designs.

Smaller deflections than with steel and reinforced concrete.

Good crack behavior and therefore permanent protection of the steel against corrosion.

Almost unchanged serviceability even after considerable overload, since temporary cracks close again after the overload has disappeared.

High fatigue strength, since the amplitude of the stress changes in the pre-stressing steel under alternating loads are quite small.

For the above reasons post-tensioned construction has also come to be used in many situations in buildings. CNS Infrastructure Pvt. Ltd is using post-tension (CONCRETE) slab in India (Gujarat).

by: manan.gupta12

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