PURPOSE OF PROVIDING REINFORCEMENT IN R.C.C AND GENERAL CRITERIA FOR ACCEPTANCE OF REINFORCEMENT.

Concrete is weak in tension and it is to be reinforced properly with suitable material. 

The purpose of providing reinforcement in R.C.C. is :

  • To take up all the tensile stresses developed in the structure.
  • To increase the strength of concrete sections.
  • To prevent the propagation of cracks developed due to temperature and shrinkage stresses.
  • To make the sections thinner as compare to plain concrete section.

General acceptance criteria for reinforcement.


1. The reinforcing material should develop a perfect bond with concrete to transfer stresses from one material to other.
2. It should have high tensile strength.
3. It should be cheap, easily available and durable.
4. The coefficient of thermal expansion of the reinforcing material should be nearly same as that of concrete, for obtaining a good composite action.
5. It should be workable i.e., easy to cut, bend and join.
6. It should not react with other ingredients of R.C.C.
7. It should be free from loose mill scales, loose rust and coats of paints, oil mud or any other substances which may destroy or reduce bond.


Steel is a most suitable reinforcing material in R.C.C. because of following reasons :

1. Steel is very strong in compression, tension, shear and torsion.
2. Concrete develops very good bond with steel.
3. Steel is ductile in behaviour. More ductility means more elongation of steel before failure.
4. The steel bars can be cut, lifted and welded easily with commonly available tools and machines.
5. Steel has longer life.

6. Steel is easily available.

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