Which method of reducing a sample must be used with fine, dry aggregate?

The method of reducing a sample that must be used with fine, dry aggregate is the mechanical splitter. This technique is specifically designed to handle fine materials effectively, ensuring an accurate and representative sample by dividing the aggregate without disturbing its gradation.

Fine, dry aggregates can be difficult to manage due to their small size and potential for segregation. The mechanical splitter provides a consistent and reliable means of reduction, minimizing the risk of human error and ensuring that the aggregate’s properties remain intact during the sampling process.

Other methods, such as rotary dividers and bucket splitters, may not be as effective for fine aggregates due to their operational characteristics; they tend to be better suited for coarser materials. Additionally, hand scaling could introduce variability and inconsistency in the sampling process, making it less appropriate for a precise method required for fine aggregates. Thus, using a mechanical splitter is the preferred and correct option in this scenario.