What is the minimum spacing between parallel reinforcing bars placed in two or more layers?

• A. 1 Inch
• B. 3/4 Inch
• C. 1/2 Inch
• D. 2 Inches

Answer: (A)

When reinforcing bars are placed in two or more layers, you need a clear spacing to allow concrete to flow and properly surround each bar, ensuring adequate consolidation and bond. A one-inch gap provides enough room for cement paste to fill between bars and for the vibrator to compact the concrete without leaving voids. Spacing smaller than this would crowd the bars and risk voids and weak bond, while a larger gap would simply exceed the minimum requirement. So the minimum spacing is one inch.