When calculating the Minus #200, which measurement is used for division?

The correct approach to calculating the Minus #200 is to use the total dry mass of the sample for division. This measurement is crucial because it provides a consistent basis for comparison of the amount of material that passes through the #200 sieve relative to the entire sample. By using the total dry mass, you ensure that the percentage of fines (material passing through a #200 sieve) is relative to the complete, unaltered mass of the original sample, which enhances the accuracy of the calculation.

In this context, calculating the percentage of material that passes the #200 sieve is essential for determining the gradation of the aggregate, which in turn affects the performance characteristics of the mixture. Therefore, the total dry mass serves as the baseline measurement for all components of the aggregate, allowing for accurate assessments of quality and performance compliance as defined in various specifications.

Using other masses, like the dry mass of the fines, would not provide a comprehensive view of the mixture's composition, and wet mass would not yield accurate results in aggregate calculations due to the presence of moisture. This makes the choice of total dry mass not only appropriate but necessary for accurate calculations in aggregate mixture assessments.