This discussion presents the allowable period before striking the formworks for
vertical members; columns, walls, etc. and the soffit slabs and beams. Early
striking of formworks is controlled by the concrete strength reached within that
period, ambient temperature, mechanical damage might occur due to striking
before that recommended by the BS8110-1997 and CIRIA Report 136.

BS8110-1997

CIRIA Report 136

CIRIA Report 136However, if you want to reduce the striking time further, refer
to CIRIA Report 136 below: