Answer Posted / patricio baluga jr

Fill up the whole cone up to the top with some excess
concrete coming out of top, then repeat tamping 25 times.
(if there is not enough concrete from tamping compression,
stop tamping, add more, then continue tamping at previous
number)
Remove excess concrete from the opening of the slump cone
by using tamping rod in a rolling motion until flat.
Slowly and carefully remove the cone by lifting it
vertically (5 seconds +/- 2 seconds), making sure that the
concrete sample does not move.
Wait for the concrete mixture as it slowly slumps.
After the concrete stabilizes, measure the slump-height by
turning the slump cone upside down next to the sample,
placing the tamping rod on the slump cone and measuring the
distance from the rod to the ORIGINAL DISPLACED CENTER.

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