Building Post Tensioned Slab
Basic Concepts of Pre-stressing:
"Prestressed concrete is basically concrete in which internal stresses of a suitable magnitude and distribution are introduced so that the stresses resulting from external loads are counteracted to a desired degree. In reinforced concrete members, the pre-stress is commonly introduced by tensioning the steel reinforcement."
How PT Works:
P-T v/s R.C.C. ~ A Cost - Benefit Ratio:
- P-T reduces the concrete volume by 10 to 20%
- Cost of reinforcing is typically 20 to 30% less as compared to conventional reinforced structure.
- Form work can best ripped off after 6-7days(as soon as stressing is completed),there by saving time & money by achieving project target completion before the due date.
- Average bay(Column) spacing is 25 to 30 feet without increase in the slab thickness, thus saving construction cost.
- Concrete Slabs are thinner and consequently lighter and lesscostly.
- More clear Headroom obtained through P-T Assembly Installation. Cost Benefit in Electrical Conduits (per ft.) & relative consumption of accessories, fixtures, thereby enhancing uninterrupted electrical work.
- For flats lab in 8m x 8m or 9m x 9m Grid, P-T costs approximately Rs.45 to 50 per sq. ft. with any kind of desired geometry availed better than R.C.C.
- Since the reinforcement is protected, P-T reinforced structures have lower annual maintenance costs over time (life cycle costs).
Advantages of Bonded PT System:
- Lighter and Slender members are possible.
- Section remains un-cracked under Service load.
- Less deformation improves serviceability.
- Fast construction can achieved because scaffolding can be removed after stressing. l More aesthetic appeal due to slender sections.
- Flat soffit reduces shuttering, plastering and painting cost.
- Reduces building height.
Application:
- High-rise buildings l Bridges
- Silos
- Tanks
- Ground floor slabs, Raft Slabs
- Ground Anchors
- Railway Sleepers, Electric poles, Piles, Pressure vessels, Concrete pavement,
- Shells, Folded Plates.
- Concrete chambers in nuclear reactors.
PT Floor Slab System:
Post tension Slab Construction sequence:
Visual from Site - (Under Construction):
Post tensioned slab for govt official buildings.
Post tensioned slabs for parking.
Post tensioned slabs for malls, hotels & podium.
Post tensioned slab/beam for cantilever structure.
Completed:
Surya Treasure Island Mall, Bhilai (C.G.)
Sky Vistas Podium, Mumbai
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