What are coarse aggregates?

Coarse aggregates are primarily defined as the materials that are predominantly retained on the #4 sieve. This means that they have relatively larger particle sizes, typically ranging from 3/8 inch to 1 inch or more, which distinguishes them from fine aggregates that pass through the #4 sieve. In the context of construction and concrete production, coarse aggregates provide strength and bulk to concrete mixtures, helping to enhance the structural integrity of the final product. Their characteristics are crucial for determining the concrete's mechanical properties, such as its load-bearing capacity and durability.

The focus on being predominantly retained on the #4 sieve aligns with established industry standards and definitions, making it a clear and precise classification of coarse aggregates. Understanding this classification helps in the proper selection of materials for various construction applications, ensuring that the concrete mix meets the required specifications for performance and safety.