Which component is not typically included in an admixture?

The component that is not typically included in an admixture is aggregates. Admixtures are materials added to concrete or mortar before or during mixing to enhance certain properties, such as workability, durability, or setting time. While water, cement, and aggregates are the fundamental components of concrete, admixtures serve as additional ingredients that modify the performance characteristics of the concrete mix.

Aggregates are the primary inert materials in concrete, consisting of sand, gravel, or crushed stone which provide bulk and strength to the concrete. They are essential to the basic mix but are not classified as an admixture. Instead, admixtures are supplementary materials used to enhance the properties of the concrete without replacing the integral components like aggregates. Therefore, while aggregates are a crucial part of the overall concrete composition, they do not fall under the category of admixtures.