Correct Answer - Option 1 : 3 × 10
-4
Concept:
Loss due to shrinkage of concrete:
Shrinkage is defined as a change in volume of concrete members. It is dependent on humidity in atmosphere with passage of time but is unrelated to application of load.
For pre-tensioned members:
Loss of stress due to shrinkage = εcs х E,
Where,
εcs = Total residual shrinkage strain having values of 3 × 10-4 for pre tensioned member.
For post-tensioned members:
Loss of stress due to shrinkage = \(\frac{{0.0002}}{{{\rm{log}}\left( {{\rm{t}} + 2} \right)}}\),
Where,
t = age of concrete at transfer in days and Es = modulus of elasticity of steel
