POST TENSION SLAB
Post-Tensioned Slab
- Study the suitability of the model and estimate the construction price
- Provide academic advice and construction methods
- Design the Post-Tension floor structure according to the ACI or EIT standard
- Sales and installation services
- Post-Tension floor
- Precast concrete walls outside the building
- Other precast concrete structure parts
- Cutting Post-Tension floor parts in the original building
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Estimeted Thickness of floor
Estimated Post-Tension Floor Thickness
Building type
Length between pole
6
8
10
12
Apartment, Hotel and Dormitory
15-18 cm.
18-23 cm.
22-25 cm.
22-25 cm.*
Office Building
18-22 cm.
20-23 cm.
22-25 cm.
22-25 cm.*
Department store, school building
20-22 cm.
22-25cm.
22-25 cm*
22-25 cm.*
Factory and warehouse
Depending on the weight of building
* Must have Drop Panel or Band Beam to support the weight
Note: The thickness depends on
1. The position and size of the floor level reduction in the bathroom and other building corridors
2. The shape of the building and the opening of the building -
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Materials used for Post-Tension
1. Concrete compressing strength 320 kg per square meter tested with a 28-day cylinder test rod
2. High tensile steel stranded wire can receive tensile strength up to 18,730 kg per line (7-Wire Strand, diameter 12.7 mm in accordance with TIS 420 or ASTM A416 standard)
3. Reinforced steel that accepts pulling force of 4,000 kilograms per square meter, SD40 quality floor
4. Anchorage series for clamping the compression wire of the company, Post Co., Ltd. (US ANCHORA)
5. Pipe for Corrugated Galvanized Sheath
6. Bar chair
7. Water mortar -
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Sequence of construction
1. Install scaffolding, formwork and side form work
2. Fixing bottom reinforcement
3. Install Recess, Former, Anchorage
4. Fixing the strand and put the grout vent pipe for use in the compression of cement.5.Fixing top reinforcment
6.Pouring concrete
7.Curing concrete and removing form work and Recess Former
8.Stressing strands when Compressive Strength of concrete more than 240 ksc. (Cylinder)
9.Cutting tail of strands
10.Plastering end recess with mortar
11.Release the formwork and shoring 50%
12.Grouting after all scaffoldings were removed
The principle of load (weight) of the Post-Tension floor system
Due to the unique properties of concrete, concrete has high compressive strength but less tensile strength therefore, the concrete structure must be reinforced with the strength of the concrete.
Reinforced concrete structure use reinforcing steel to help concrete get traction.
The Post-Tension floor structure is to increase the tensile strength of the concrete by putting compressive strength on the concrete structure before loading.
The result of the vertical wire curving resulting in a lifting force in the floor structure, allowing the deflection of the floor to be less than the reinforced concrete structure