I have another thread on the forum dealing with my issues testing a bentonite mix. The questions are sort of linked. The Federal lab that is also doing plasticity indexes on the material are getting huge numbers. My numbers average 8. Another lab is getting around 10. The Fed lab averages 14. We compared techniques and it came out that the Feds are grinding by hand using a rubber glove. Everyone else is using a rubber tipped mortise and pestle. AASHTO R58 does not mention gloves or by hand. Has anyone else heard of this hand method?
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