SlumpTest Procedure.pdf

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SLUMP TEST PROCEDURE
(FIELD TESTING)
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To obtain a representative sample, take
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Dampen inside of cone and place it on a
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samples from two or more regular intervals
throughout the discharge of the mixer or
truck. DO NOT take samples at the begin-
ning or the end of the discharge.
smooth, moist, non-absorbent, level surface
large enough to accommodate both the
slumped concrete and the slump cone.
Stand or, foot pieces throughout the test
procedure to hold the cone firmly in place.
Fill cone 1/3 full by volume and
rod 25 times with 5/8-inch-
diameter x 24-inch-long
hemispherical tip steel
tamping rod. (This is a
specification requirement
which will produce non-
standard results unless followed exactly.)
Distribute rodding evenly over the entire
cross section of the sample.
Remove the excess con-
crete from the top of the
cone, using tamping rod as
a screed. Clean overflow
from base of cone.
4
Fill cone
2/3
full by volume. Rod
this layer 25 times with rod
penetrating into, but not
through first layer. Distribute
rodding evenly over the
entire cross section of the
layer.
5
Fill cone to overflowing. Rod this
layer 25 times with rod pen-
etrating into but not through,
second layer. Distribute
rodding evenly over the entire
cross section of this layer.
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7
Immediately lift
cone vertically with
slow, even motion. Do
not jar the concrete or
tilt the cone during
this process. Invert the
withdrawn cone, and
place next to, but not
touching the slumped concrete. (Perform in
5-10 seconds with no lateral or torsional
motion.)
Lay a straight edge across the top of
the slump cone. Measure the amount
of slump in inches
from the bottom of
the straight edge to the
top of the slumped
concrete at a point
over the original
center of the base. The slump operation shall
be completed in a maximum elapsed time of 2
1/2 minutes. Discard concrete. DO NOT use in
any other tests.
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