What is the main function of reinforcing steel in concrete?

• A. To resist tensile stresses and increase strength and ductility.
• B. To reduce cost.
• C. To improve color.
• D. To reduce water content.

Answer: (A)

Concrete handles compression well but struggles with tension. The reinforcing steel’s main function is to resist tensile stresses and increase both strength and ductility of the member. Rebar carries the pulling forces that occur when a beam bends or loads try to pull the concrete apart, and its high tensile strength and ductility help prevent cracking from growing uncontrollably. The steel and concrete work together as a bonded composite, so the overall structure can span longer and carry greater loads without failing in a brittle way. Other options miss this essential purpose: reinforcement isn’t primarily about cost, color, or reducing water content.