WHAT IS PRESTRESSED CONCRETE - ADVANTAGES OF USING PRESTRESSED CONCRETE AND ITS APPLICATION

Q.WHAT IS PRESTRESSED CONCRETE ?

PRESTRESSED CONCRETE :-

Prestressed concrete is high-strength concrete with high tensile steel wires embedded and tensioned, prior to the application of external loads. By this, the concrete can be pre-compressed to such  a degree that, after the structure is loaded, thek is practically no resultant tension developed in the beam.

# APPLICATION OF PRESTRESSED CONCRETE

• long spans structures (as in bridges) 

   

Prestressed reinforcement used in long span bridge

• where cracks (even hairline) in concrete are not permitted (as in pressure vessels, pipes and

water tanks) 

 

Prestressed concrete tank 

• fatigue loading is encountered (as in rail track sleepers)

Rail track sleepers of prestressed concrete

ADVANTAGES OF USING PRESTRESSED REINFORCEMENT 

Serviceability and Strength

1. Reduces occurrence of cracks .
2. Freezing & thawing durability is higher than non prestressed concrete
3. Section remains uncracked under service loads
4. Reduction of steel corrosion
5. Increase in durability.
6. Full section is utilized
7. Higher moment of inertia (higher stiffness)
8. Less deformations (improved serviceability).
9. Increase in shear capacity.
10. Improved performance (resilience) under dynamic and fatigue loading.
11. In areas where there are expansive clays or soils with low bearing capacity, post-tensioned slabs-on-ground and mat foundations reduce problems with cracking and differential settlement.
12. Reduces self weight of building thereby reducing the lateral load resisting system. Suitable for use in pressure vessels, liquid retaining structures.

Demonstration of advantage of Prestressing

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