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concrete cylinder sammples

SCBO1

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Oct 28, 2009
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Has the concrete cylinder samples process changed.

Generally,
It's a smooth rod twenty-five times per cylinder lift,
smaller cylinder has two lifts
and the larger one has three lifts.
then you scrape off the top for the cap and mark it.

I thought it use to be twenty-one times

Lost in the 80's
 
Per ASTM C31 it has been 25 times per lift; 2-lifts for 4" cylinders and 3-lifts for 6" cylinders

Not sure if it changed in the 2018 version of C31, but cant imagine that it has.
 
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