RCC Structures Design
In a pre-stressed member it is advisable to use

High strength concrete only
Low strength concrete only
Low strength concrete but high tensile steel
High strength concrete and high tensile steel

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RCC Structures Design
A pre-stressed concrete member is preferred because

Its dimensions are not decided from the diagonal tensile stress
All listed here
Removal of cracks in the members due to shrinkage
Large size of long beams carrying large shear force need not be adopted

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