Which term describes aggregates with no variation in size?

The term that aptly describes aggregates with no variation in size is "uniformly graded." Uniformly graded aggregates consist of particles that are all similar in size, resulting in minimal or no variation among them. This means that the gradation curve for these aggregates would be relatively flat, indicating that the particle sizes do not differ significantly.

On the other hand, poorly graded aggregates refer to materials that have a wide range of particle sizes, which causes poor compaction and can lead to issues with stability and drainage in applications such as septic systems. Well-graded aggregates contain a wide variety of sizes, which generally improves compaction and strength. Gap-graded aggregates involve a specific range of particle sizes that intentionally skip some sizes, which can enhance certain properties but do not fit the criteria of having no variation in size.

Understanding these classifications helps in the selection and application of aggregates in septic systems, where the size of the particles can greatly influence the system's performance and effectiveness.