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C-30HDN PUMP — OPERATION AND PARTS MANUAL — REV. #11 (03/29/12) — PAGE 61
Figure 41-A. Slump Test (1/3 Full)
Figure 41-C. Slump Test
(Full-Overflow)
Figure 41-B. Slump
Test (2/3 Full)
Figure 41-D. Slump Test
(Removing Excess Concrete)
Figure 41-E. Slump Test
(Cone Invert)
Figure 41-F. Slump Test
(Measurement)
1. To obtain a representative sample (concrete), take sev-
eral samples at three or more regular intervals throughout
the discharge of the mixer or truck. DO NOT take samples
at the beginning or end of the discharge.
2. Dampen the inside of the cone and place it on a smooth,
moist, nonabsorbent, level surface large enough to ac-
commodate both the slumped concrete and the slump
cone. Stand on the “foot pieces” throughout the test
procedure to hold the cone firmly in place.
3. Fill the cone 1/3 full by volume (Figure 41-A) and rod 25
times with a 1/2” dia x 24” lg. bullet-pointed steel rod. (This
is a specific requirement which will produce non-stan-
dard results unless followed exactly.) Distribute rodding
evenly over the entire cross section of the sample.
4. Fill cone another 1/3 (Figure 41-B) which will make the
cone 2/3 full by volume. Rod this second layer 25 times
with the rod penetrating into, but not through, the first layer.
Distribute rodding evenly over the entire cross section of
the layer.
5. Fill cone to overflowing (Figure 41-C). Rod this layer 25
times with rod penetrating into but not through, the second
layer. Distribute rodding evenly over the entire cross
section of this layer.
6. Remove the excess concrete (Figure 41-D) from the top
of the cone, using the tamping rod as a screed.
7. Lift the cone vertically (Figure 41-E) with a slow even
motion. DO NOT jar the concrete or tilt the cone during this
process. ( Invert the withdrawn cone, and place it next to,
but not touching the slumped concrete.
8. Lay a straight edge (Figure 41-F) across the top of the
slumped 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 must be complete in a maxi-
APPENDIX — C-30HDN C-30HDN SLUMP TEST PROCEDURE
BULLET POINTED
STEEL ROD
1/2 DIAMETER
24 INCHES LONG
1/3 FULL
FOOT
PIECE
2/3 FULL
FULL
(OVERFLOW)