If pounds of aggregate per cubic yard (SSD) is 1174 and the corrected weight is 1227, what is the amount of free water?

To determine the amount of free water in this scenario, it's essential to understand the relationship between the saturated surface dry (SSD) weight of aggregate, the corrected weight, and the water present in the mix.

The value given for pounds of aggregate per cubic yard (SSD) is 1174 pounds. This figure represents the weight of the aggregate when it is saturated but not wet, essentially indicating that the aggregate has absorbed water but does not have any excess moisture on the surface. On the other hand, the corrected weight of 1227 pounds reflects the actual weight of the aggregate in its current state, which includes any excess free water present along with the SSD weight of the aggregate.

To find the amount of free water, one simply subtracts the SSD weight from the corrected weight:

Corrected weight - SSD weight = Free water

Applying the numbers:

1227 lbs (corrected weight) - 1174 lbs (SSD weight) = 53 lbs (of free water)

This calculation shows that the amount of free water in the mix amounts to 53 pounds, supporting the selection of this option as the correct answer. Understanding this relationship between the weights helps in quality control during concrete production, ensuring the right amount of water is used for optimal