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how shrinkage affects pre-stressed concrete?

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Shrinkage of concrete and "creep" of concrete and of steel reinforcement are potential sources of prestress loss   and are provided for in the design of prestressed concrete. Shrinkage:The magnitude of shrinkage may be   in the range of  0.02% depending on the environmental conditions and type of concrete.With pre- tensioning, shrinkage starts as soon as the concrete is poured
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