In reinforced concrete, what property is enhanced by embedding steel?

• A. Tensile strength
• B. Compressive strength
• C. Thermal conductivity
• D. Density

Answer: (A)

The essential idea is that reinforced concrete works as a composite: concrete handles compression well, but is weak in tension. When steel is embedded, it carries the tensile stresses that develop as the member bends or is pulled. The bond between steel and concrete lets the two act together, so cracks form slowly, the member can carry higher loads, and it behaves more ductilely rather than failing suddenly. So, embedding steel directly enhances tensile strength (and overall flexural capacity) of the concrete member.

The other properties aren’t the primary goal here: compressive strength is mainly governed by the concrete itself, while thermal conductivity and density aren’t the main performance targets of reinforcement.