Besides increasing strength, what is another benefit of proper aggregate gradation?

• A. It improves packing of aggregates, reducing voids.
• B. It increases cement demand.
• C. It reduces the need for curing.
• D. It eliminates the need for reinforcement.

Answer: (A)

Proper aggregate gradation creates dense packing, where large and small particles fit together so tightly that the spaces between them are minimized. When particle sizes span a broad range, the bigger pieces leave gaps that the smaller pieces can fill, and those gaps are filled by progressively finer material, reducing the overall volume of voids. Fewer voids mean a denser concrete with less space to be filled by cement paste, which also helps with durability and reduces permeability. So, beyond increasing strength, well-graded aggregates improve packing efficiency and minimize voids.