What effect does angularity have on the interlocking of fine aggregates?

Angularity plays a significant role in the interlocking of fine aggregates, directly affecting the structural integrity and stability of the material. When fine aggregates are more angular, their shape allows for greater interlock between particles. This interlocking ability enhances the density and stability of the aggregate matrix, which contributes to better load transfer and improved mechanical performance.

Furthermore, an angular particle shape provides more surface area for frictional resistance between the particles, which can contribute to higher shear strength within the aggregate base. This can lead to a more robust and durable mix, improving the overall performance in applications like pavement and subgrade support.

In contrast, round aggregates tend to provide less interlock because they roll against one another more easily, which can lead to lower stability and potentially weaker performance under load. Therefore, the assertion that angularity improves interlocking and packing density accurately reflects the mechanics of how aggregate shapes influence the structural capabilities of fine aggregates.