What is the maximum diameter of aggregate in the mix for which mixer blade clearance can exceed 2.5 cm?

The maximum diameter of aggregate in the mix that allows the mixer blade clearance to exceed 2.5 cm is critical for ensuring proper mixing and preventing damage to the equipment. Typically, when the aggregate size increases above a certain limit, the clearance between the mixer blades and the drum of the mixer must increase to accommodate the larger particles without causing blockages or inadequate mixing.

In this case, an aggregate diameter of up to 3 cm is reasonable. At this size, while it remains manageable for mixing, there is still enough space for the blades to function effectively without risking interference with the larger aggregates. Beyond this diameter, particularly at 4 cm or above, the likelihood of mixing inefficiency or damage increases, necessitating greater clearance which would compromise the mixing process.

Choosing a maximum aggregate diameter of more than 3 cm would mean that the clearance requirement wouldn't be met effectively, leading to potential issues. Therefore, recognizing this limit allows for optimal mixing performance while maintaining operational safety and equipment integrity.