Concrete is strong but also needs tension to make it stable and steel reinforcement is what gives concrete the tension that it needs.

The reason why steel is often used to reinforce concrete is due to the fact that steel and concrete have similar thermal expansion qualities. In simple terms, when the air gets hot, the steel and the concrete expand well together and when the air gets cold, it contracts well together. Steel that is placed in concrete for support has ribbing on it that prevents the steel from slipping or moving around in the concrete.

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