Concrete is good in resisting compressive stress but is very weak in resiting tensile stresses. Hence reinforcement is provided in the concrete wherever tensile stress is expected. The best reinforcing material is steel, since its tensile strength is high and bond between steel and concrete is good. Since elastic modulus of steel is quite high compared to concrete, the force developed in steel is high. A cage of reinforcements is prepared as per the design requirements, kept in the form work and then green concrete is poured. After the concrete hardens, the form work is removed. The composite material of steel and concrete, now called R.C.C. acts as a structural member and can resist tensile as well as compressive forces efficiently.

Uses of R.C.C.

1. R.C.C. is used as a structural member wherever bending of the member is expected. The common structural elements in a building where R.C.C. is used are:
(a) Footing
(b) Columns
(c)  Beams, lintels
(d)  Chejjas, roof slabs
(e)  Stairs.

2. R.C.C. is used for the construction of storage structures like:
(a)  Water tanks
(b)  Dams
(c)  Silos, bunkers

3. They are used for the construction of
(a)  Bridges
(b)  Retaining walls
(c)  Docks and harbours
(d)  Under water structures

4. R.C.C. is used for building tall structures like
(a)  Multistorey buildings
(b)  Chimneys
(c)  Towers.

5. R.C.C. is used for paving
(a)  High ways
(b)  City roads
(c)  Airports.

6.R.C.C. is used in atomic plants to prevent radiation. For this purpose R.C.C. walls built are as thick as 1.5 m to 2.0 m.
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