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how the slump and Compressive Strength of concrete cube is
performed in a civil engg lab ?
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Answer Posted / narendra
Apparatus:-Large pan,Trowel to mix concrete mixture,Steel
tamping rod(20 mm dia.),Slump cone,Ruler,Fresh Concrete
(Cement, water, sand, aggregates and admixes).
Steps
Place the mixing pan on the flat and levelelled floor and
moisten it with some water. Make sure it is damp but no
free water is left.
Place the sand in the pan. Add the cement and mix it with
the sand.
Add the coarse/fine aggregate and thoroughly mix.
Mix the water and dry cement ingredients thoroughly using
the trowel.
Firmly hold the slump cone in place using the 2 foot holds
(nut bolt or any other arrangement).
Fill one-third of the cone with the concrete mixture. Then
tamp the layer 25 times using the steel rod in a circular
motion, making sure not to stir.
Add more concrete mixture to the two-thirds mark. Repeat
tamping for 25 times again. Tamp just barely into the
previous layer(1")
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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