In BS4449:1997 it species a re-bend test of steel reinforcement where
reinforcing steel is bent 45o at 100oC for an hour and then bent back by 23o.
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It is not uncommon that steel reinforcement is bent prior to installation into concrete structure. However, upon bending process steel reinforcement may fracture owing to the following reasons:
(i) The ribs on steel bars serve as location of stress concentration which is a potential weak point for fracturing.