"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.
High-rise buildings l Bridges
Ground floor slabs, Raft Slabs
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.
Sanfield (India) Limited is the exclusive designers, manufacturers and installers of a wide range of High Performance, Specialized Construction Related Products, manufactured in Technical collaboration with various world renowned Companies.