Which mechanical washing device is allowed for coarse aggregate samples if it produces results consistent with manual procedures?

The Ploog Washer is recognized for its effectiveness in cleaning coarse aggregate samples in a manner that yields results consistent with manual washing procedures. This is significant because maintaining consistency between mechanical and manual methods is crucial for ensuring that the results of aggregate testing are reliable and comparable. The Ploog Washer uses water flow to apply mechanical action, helping reduce the time and effort involved in the washing process while effectively removing unnecessary fines and dust from the aggregates.

In aggregate testing protocols, the ability to replicate manual washing results with a mechanical device is imperative. The design of the Ploog Washer allows it to be employed without compromising the integrity of the sample—this aligns with the standardization needed in aggregate testing. The assurance that a mechanical device operates effectively while producing comparable results to traditional methods justifies its acceptance in regulatory practices.

Other devices listed may not provide the same level of consistency or may be better suited for different applications not focused primarily on washing coarse aggregates. For instance, while rotary washers and hydrocyclones serve practical purposes, they may not align strictly with the requirements for replicating manual washing outcomes. The screener is typically used for sorting aggregates rather than cleaning them, which would not meet the specific needs of this washing process. Thus, the Ploog