Loss of pre-stress is not directly related to

Explanation:

The various losses in pre-stressed are:

 Pre-tensioning:

1. Elastic deformation concrete.

2. Relaxation of stress in steel.

3. Shrinkage of concrete.

4. Creep of concrete.

Post-tensioning:

1. No loss due to elastic deformation if all the wires are simultaneously tensioned. If the bars are successively tensioned, there will be loss of prestress due to elastic deformation of concrete

2. Relaxation of stress in steel.

3. Shrinkage of concrete.

4. Creep of concrete.

5. Friction.

6. Anchorage slip

From the above factors, we can say that Loss of pre-stress is not directly related to the grade of concrete.