Functions of grout inside tendon ducts

What are the functions of grout inside tendon ducts?

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Grout in pre-stressing work serves the following purposes:
(i) Defends the tendon from corrosion.
(ii) Makes the final capacity of tendon better.
(iii) Serves as a bond between the structural member and the tendon.
(iv) In case of failure, the anchorage will not be affected by all strain energy.

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