| PT Slab Benefits |
| Longer Spans |
Post-tensioning permits longer spans than conventional reinforced concrete. Large column-free floor areas provide increased
flexibility for internal planning and space utilization.
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| Flat Soffits |
Two-way post-tensioned flat slabs dispense with the requirement for drop beams, providing enhanced flexibility for space partitioning
and for the placing of service networks (HVAC, electrical, sanitary, etc…).
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| Deflection Control |
By varying the amount of balanced post-tensioning force, the designer is able to control deflection under service loads. |
| Thinner Slabs |
Pre-stressing with appropriate tendon profiling and resultant load balancing effects enables reduced slab thickness. Maximum
ceiling service zones are available for horizontal services.
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| Flexibility of Services |
The simple concept of post-tensioned slabs, has a reduced amount of rebar and flexibility in the positioning of openings and inserts
for services. Little coordination is required between designers for this purpose, and late modifications can be implemented without detriment
to the initial structural and architectural design.
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| Flexibility of Layout |
The design of post-tensioned slabs can cope with irregular grids and curved floor plates. Tendons can easily be profiled horizontally to suit
any layout geometry or to allow for openings in slabs.
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| Future Flexibility |
The concerns about the demolition or alterations of post-tensioned slabs have been dispelled in recent years. Knockout zones can be easily
identified for future service penetrations. Tried and tested methods are available to enable large openings to be formed subsequently in as built slab conditions.
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| Reduced Storey Height |
Due to the minimal need for drop beams and the reduced slab thickness, minimum storey height is achieved, leading to a lower overall
building height. In situations where the height of the building is limited, the reduced storey height can allow for additional floors to be constructed
within the building envelope. The reduced façade area, as well as the vertical runs of mechanical and electrical systems sees cost benefits.
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| Crack Control |
Post-tensioned floors being in compression, allow for easier control of cracking. If appropriate design criteria are applied, crack-free construction
can be achieved. This is often exploited in car parks with concrete surfaces exposed to an aggressive environment. With reduced cracking and better
water tightness, the durability of the structure is improved.
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