PRE & POST STRESSING
Prestressed Wall
Prestressed inverted beam
Prestressed wall panel on site
Prestressed Wall
Benefits
Stressed concrete offers many advantages over traditional reinforced concrete structures.
Durable
In Post & Prestressed concrete the reinforcing steel is stretched, and exerts more force on the concrete when it is released, resulting in a stronger, more durable material.
Cost-effective
The pre-tensioned steel applies compressive stress to the concrete, so it is less likely to crack under stress. This can help to reduce maintenance costs and extend the lifespan of the structure.
Time-saving
Stressed concrete is precast offsite, it can be installed more quickly than traditional reinforced concrete. This reduces construction time and costs.
Quality Control
Because pre-tensioned concrete is manufactured offsite, it can be produced under controlled conditions, ensuring consistent quality and reducing the risk of defects.
Applications of Pre-tensioned and Post-tensioned concrete
It has many applications such as infrastructure components, commercial buildings, residential building and other products that are made in precast construction
Precast Girders
U-Girder, I-Girder, T-Girder & Box-Girder
Precast Beams
Prestressed Compound Walls
Crash Barrier
Advantages of Stressing
Time Saving
50%
Compared to cast in situ construction
Cost Saving
30%
In large construction projects.
About Stressing
Stressing or Tensioning is the process of inducing known persistent tensile stress in a concrete structure or element before the application of the full or live load. This tensile strength in the steel cables, strands, steel tendons, cables, or rods are mechanically attached to the prestressed portion thus increasing the compressive strength of civil structures. Stressed concrete makes for a high-strength concrete with a higher ability to withstand service loads & compressive stresses.
Pre stressing & post stressing is also known as pre tensioning & post tensioning. The following are two basic classification techniques for the Stressing System:
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Pre-Tensioning: Prestressing simply implies that the tensile steel is strained (drawn or tensioned) prior to casting the concrete and applying external loads.
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Post-Tensioning: In Post stressing system, the concrete is cast first, and after the concrete gains its ultimate strength then the tension is added; nonetheless, it is still strained before the load is added, although it is still prestressed
Prestressed concrete & post stressed concrete are most commonly used for mass manufacture of concrete structures such as short span constructions, railway bridges, electricity polls, fences, pre-tensioned slabs, pre-stressed concrete bridges, etc.
