Correct option is A
Concept of Voids in Aggregates:
Voids refer to the spaces between aggregate particles that are not filled by the solid material.
To minimize these voids, aggregates of varying sizes are used so that smaller particles fill the gaps between larger ones.
Explanation of the Options:
(a) Aggregates of varying sizes: Using aggregates of different sizes reduces voids by allowing smaller aggregates to fill the gaps between larger particles, resulting in a denser packing.
(b) Manufactured aggregates: While they have controlled properties, the use of varying sizes is more effective in reducing voids.
(c) Aggregates of the same shape: Shape affects workability but does not significantly reduce voids without size variation.
(d) Aggregates all of the same size: Uniform size leads to larger voids because gaps remain unfilled.
