How does the shape of aggregate particles influence their performance?

The shape of aggregate particles plays a crucial role in determining their performance in construction and paving applications. Angular particles, characterized by sharp edges and a more irregular form, are particularly effective at enhancing interlocking when compacted. This interlocking creates a denser and more stable mass, which can better resist movement under load. This quality is especially desirable in applications such as road bases and pavements, where high stability under traffic loads is necessary.

In contrast, rounded particles tend to have smoother surfaces and lack defined edges, which can lead to reduced interlocking. This property might make them less effective in providing the necessary stability and load-bearing capacity in certain applications. While rounded aggregates can be beneficial in certain contexts, such as in concrete mixes where workability is a concern, they generally do not enhance interparticle friction to the extent that angular particles do.

Therefore, the performance benefits associated with angular particles—particularly their ability to interlock and provide stability—make this the most accurate choice regarding the influence of particle shape on aggregate performance.