What does the term "saturated surface dry" imply about the aggregates?

The term "saturated surface dry" refers to a specific condition of aggregates where they contain moisture within their internal pores but do not have any visible moisture on their surface. This state indicates that the aggregate particles have absorbed water, filling the pores to their maximum capacity without any excess water present on the outside.

This condition is crucial in concrete mix design and measurements as the moisture content of the aggregates can significantly influence the water-cement ratio. When aggregates are in a saturated surface dry state, they are at an optimal condition for accurate weight measurements. Understanding this condition helps ensure that the correct balance is achieved in the concrete mix, leading to the desired strength and durability of the final product. This concept is essential in both practical applications and theoretical studies within the field of concrete technology.