How to Optimize Fines Content Determinations

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Particle size samples are often agitated in water and washed over a fine sieve such as a No. 200 or No. 325 (75 or 45µm) to remove undersize fines. This might be done simply to make the sample easier to process on sieves after drying, or to actually determine the percentage of the fines fraction. ASTM C117 is a method to measure percent of materials finer than No. 200 (75µm) in an aggregate sample.

What is the Purpose of an Aggra-Washer?
Manual washing methods to remove sample fines are effective but have the tendency to generate inconsistencies. Automatic Aggra-Washers gently and thoroughly wash soil and aggregate samples to remove fines passing the No. 200 sieves for more precise and consistent results.

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