As steel has high tensile strength, steel rebar is added to the tension side of the slab, usually the bottom.

Name: As steel has high tensile strength, steel rebar is added to the tension side of the slab, usually the bottom.
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Steel rebar is added to the tension side of concrete structures, such as the bottom of slabs, because steel has high tensile strength and can handle the tensile stresses that concrete, which is strong in compression but weak in tension, cannot.

As Steel Has High Tensile Strength, Steel Rebar Is Added