What is the requirement for a mixture of fine and coarse aggregates when using a mechanical splitter?

The requirement for the fine portion of the aggregate to be drier than saturated surface dry (SSD) is important for ensuring accurate sampling and testing results when using a mechanical splitter. The SSD condition refers to the state where the aggregate is saturated with water, but there is no free water on the surface. If the fine aggregates are not appropriately dried below the SSD condition, there is a risk of clumping or sticking, which can lead to an uneven split and biased samples.

In aggregate sampling, moisture content can significantly impact weight measurements and subsequent calculations. By ensuring that the fine portion is drier than SSD, you help to maintain a consistent particle distribution when splitting, ultimately leading to more reliable test results. This practice is essential for achieving precision in aggregate characterization, influencing quality control processes in construction and material specifications.