What is the primary purpose of rebar in reinforced concrete?

• A. To Increase Ductility
• B. To Reduce Weight
• C. To Increase Tensile Strength
• D. To Improve Aesthetics

Answer: (C)

Concrete handles compression well but struggles with tension. Rebar provides the tensile strength that concrete cannot develop on its own. In a reinforced concrete member, bending creates tension in the bottom part; the steel reinforcement carries that tension and, bonded to the concrete, keeps cracks from opening and helps the member share loads more effectively. This cooperative action greatly increases the overall strength and ability to resist bending and cracking, which is why the primary purpose of rebar is to increase tensile strength. While ductility and progression of cracking are beneficial effects of using steel, they are not the main function, and rebar does not reduce weight or improve aesthetics.