How does the distribution of particle sizes in aggregates affect its properties?

The distribution of particle sizes in aggregates significantly affects various physical and mechanical properties, which is why the selected answer highlights its influence on density, strength, and stability. A well-graded aggregate, which contains a mix of different particle sizes, allows for better packing of the particles. This optimal packing results in a denser aggregate, minimizing voids and leading to better strength characteristics.

When aggregates have a wide particle size distribution, smaller particles can fill the spaces between larger particles. This compact arrangement not only increases the density of the aggregate but also enhances the overall stability of the material, making it less susceptible to deformation under load. Additionally, the strength of concrete or other composite materials is directly linked to the characteristics of the aggregates used, including their size distribution. A balance in sizes contributes to the load-bearing capacity and durability of the construction material.

In contrast, options that suggest minimal impact or are not related to performance do not capture the fundamental role that particle size distribution plays in aggregate behavior in structural applications. Thus, understanding how particle size distribution affects these critical properties is essential for anyone working in aggregate testing and related fields.