Why are the steel bars used with concrete in RCC? Why are the bars of other material not used?

 We all know that all substances expands with increase in temperature and shrinks with decrease in temperature.

RCC means Reinforced Cement Concrete. It is the combination of steel bars and concrete. When we design RCC, a strong joint takes place between concrete and steel bars which acts as one body.

Now, when the temperature of atmosphere increases, both steel bar and concrete will try to expand. Similarly, when temperature falls, they will try to shrink. We use steel bar with concrete in RCC, because their coefficient of thermal expansion is approximately equal. Due to this reason, they expand or shrink at the same rate. Therefore, the joint between the steel bar and concrete remain stable.


In the case of Al bar or Cu bar or bar of some other materials, difference between their coefficient of thermal expansion will be more. Hence, they will expand or shrink at different rate which will make the joint (between concrete and bar) unstable.

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