In construction, what does rebar contribute to concrete structures?

• A. Aesthetic appeal
• B. Structural strength
• C. Waterproofing
• D. Insulation

Answer: (B)

Rebar provides structural strength by giving concrete, which is strong in compression but weak in tension, the ability to resist tensile and bending forces. When steel bars are embedded in concrete, they carry the tensile stresses and help prevent crack growth, creating a composite system that can bear heavier loads and be more ductile. The bond between steel and concrete allows them to work together, improving overall stiffness and durability. Rebar isn’t about aesthetics, waterproofing, or insulation—those roles come from other materials and design choices.