What type of aggregates are characterized by a good variation in size?

Well graded aggregates are distinguished by their range of particle sizes, which allows them to fill the voids between larger particles with smaller ones effectively. This characteristic leads to a denser and more stable structure when used in applications such as concrete and road base materials. The diversity in size prevents excessive air pockets and enhances the overall strength and durability of the material.

In contrast, poorly graded aggregates have a limited range of sizes, often leading to larger gaps and less stability. Standard aggregates may not specifically refer to the range or distribution of sizes, and uniform aggregates are characterized by having a similar size particle, which does not facilitate the same level of compaction or strength. Thus, the option highlighting well graded aggregates accurately reflects the property of having a good variation in size, contributing to their effectiveness in construction and engineering applications.