ASTM D75/D75M-19,Standard Practice for Sampling Aggregates.It can be downloaded for free on www.freestandardsdownload.com
Securing Samples
General—Where practicable, samples to be tested for quality shall be obtained from the finished product. Samples from the finished product to be tested for abrasion loss shall notbe subject to further crushing or manual reduction in particlsize in preparation for the abrasion test unless the size of the finished product is such that it requires further reduction fortesting purposes.
Procedure
Sampling from a Flowing Aggregate Stream (Bins or Belt Discharge) —Select units to be sampled by a random method, such as Practice D3665, from the production. Obtain at least three approximately equal increments, selected at random from the unit being sampled, and combine to form a field sample whose mass equals or exceeds the minimum recommended in 5.4.1. Take each increment from the entire cross section of the material as it is being discharged. It is usually necessary to have a special device constructed for useat each particular plant.
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