Explain the role of sieve analysis in aggregate testing.

Sieve analysis plays a crucial role in aggregate testing as it is used to determine the particle size distribution of aggregates. This process involves passing the aggregate through a series of sieves with different mesh sizes and measuring the amount of material retained on each sieve. The results of the sieve analysis provide vital information about the gradation of the aggregate, which in turn affects the performance of the material in construction applications.

Understanding the particle size distribution is essential for several reasons. It influences the compactability and stability of the aggregate when used as a base or subbase material. Proper gradation can lead to enhanced interlock between particles, which contributes to improved load-bearing capacity and reduced settlement. It also helps in determining the appropriateness of the aggregate for various engineering applications, including asphalt and concrete production.

Other options do not reflect the primary purpose of sieve analysis. The chemical composition is assessed through different tests, while color and moisture content evaluations involve distinct methodologies unrelated to the particle size distribution information that sieve analysis provides.