Dalam JKR standard 2015 menyatakan sebarang pengunaan haba melebihi 100 darjah perlu
mendapat kelulusan SO dan setiap bar yang telah dibengkokkan tidak boleh diluruskan semula kecuali sebahagiannya telah ditana didalam konkrit. Berikut adalah apa yang terdapat dalan JKR Standard Section D, Concrete berkenaan perkara berikut:
6.3.1.2
Bars shall be cut and bent cold by the application of slow, steady
pressure or in an approved bar-bending machine. Bending at
temperatures in excess of 100ºC may only be carried out with the
S.O.'s approval and under his supervision. Except where otherwise
indicated in the Drawings, bars shall be bent and measured in
accordance with BS 4449.
6.3.1.3
Cold worked and hot rolled bars shall not be straightened or bent
again once having been bent. Where it is necessary to bend the free
end of mild steel reinforcement already cast in the concrete, the
internal radius of the bend shall not be less than twice the diameter
of the bar