There is a tendency or need to mix up reinforcement of different grades in the same member or in the structures in different members, such a columns, beams and slabs.For example, main reinforcement in columns can be of one grade whereas stirrups could be of other grade. This is in order as far as technical provisions for safe structural designs are concerned. However, the electro-chemical potential of reinforcement would vary from grade to grade of reinforcement and thls can initiate corrosion. This particular factor is not yet fully understcn3d and cannot be ignored.Durability provisions have not only considered strengths but have also indicated the need for matching material properties. Therefore there is a need to safeguard when two or more gradesltypes of reinforcement steels are used in one member.
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