Question

Which of the following statements is/are true about the advantages of prestressed concrete structure?

A. In the prestressed concrete structure, the deflection of beams is considerably reduced.

B. Prestressing decreases cracks in concrete under all stages of loading.

C. Prestressed concrete requires only 1/3 rd of the concrete required for R.C.C.

1. Only A
2. B and C
3. A, B and C
4. Only C

Answer 1

Correct Answer - Option 3 : A, B and C

Explanation:

Prestressed concrete: Prestressed concrete is the one in which there have been introduced internal stresses of such magnitude and distribution that the stresses resulting from external loading can be counterbalanced up to the desired degree.

Advantage of prestressed concrete structure: 

There are many advantages of prestressed concrete

• Lighter section
• Due to less weight of superstructure sizes of column/foundation are less.
• Prestressing decreases cracks in concrete under all stages of loading ( No tension or very low tension ).
• The deflection of beams is considerably reduced.
• Prestressed concrete requires only 1/3 rd of the concrete required for R.C.C.
• Shear strength is more.
• Useful for long-span structures like bridges, flyovers.

The disadvantage of prestressed concrete structure:-

• It is costly as compared to RCC.
• It can not be used for normal construction
• High supervision is required
• Skilled manpower is required
• Lots of quality control required.