Which tool is appropriate for cleaning aggregates with sizes #16 to #40?

The appropriate tool for cleaning aggregates with sizes #16 to #40 is a soft brass wire brush. This type of brush is effective in removing dirt or debris without damaging the aggregate particles. The softness of the brass bristles allows for gentle scrubbing, ensuring that the aggregates maintain their integrity while being cleaned.

Using a soft brass wire brush is particularly advantageous because it can effectively lift contaminants such as clay, silt, and dust from the surface of the aggregates. The brass material is less abrasive than steel, which helps prevent scratching or otherwise damaging the particles during the cleaning process.

Other options such as a soft china brush may not be robust enough to adequately clean the aggregates and could leave behind residue. A stainless steel wire brush, although it is durable, could be too harsh for the aggregates and may result in unwanted abrasion. A plastic scrub brush might not provide the same scrubbing power necessary for thorough cleaning, especially with finer aggregate sizes. Thus, the soft brass wire brush is indeed the best choice for this specific task.