PAGE 72 — MAYCO LS600P CONCRETE PUMP • OPERATION MANUAL — REV. #1 (09/09/19)
SLUMP TEST PROCEDURE
1. To obtain a representative sample (concrete), take
several 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, non-absorbent, level surface large enough to
accommodate both the slumped concrete and the
slump cone. Stand on the “foot pieces” throughout the
test procedure to hold the cone fi rmly in place.
3. Fill the cone 1/3 full by volume (Figure N) and rod 25
times with a 1/2” dia x 24” lg. bullet-pointed steel rod.
(This is a specifi c requirement which will produce non-
standard results unless followed exactly.) Distribute
rodding evenly over the entire cross section of the
sample.
Figure N. Slump Test (1/3 Full)
4. Fill cone another 1/3 (Figure O) 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 fi rst
layer. Distribute rodding evenly over the entire cross
section of the layer.
Figure O. Slump Test (2/3 Full)
5.
Fill cone to overfl owing (Figure P). 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.
BULLET POINTED
STEEL ROD
1/2 DIAMETER
24 INCHES LONG
1/3 FULL
FOOT
PIECE
2/3 FULL
Figure P. Slump Test (Full-Overfl ow)
6. Remove the excess concrete (Figure Q) from the top
of the cone, using the tamping rod as a screed.
Figure Q. Slump Test (Removing Excess Concrete)
7. Lift the cone vertically (Figure R) 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 Invert the withdrawn cone, and place it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.
Figure R. Slump Test (Cone Invert)
8. Lay a straight edge (Figure S) 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 maximum elapsed time of 1-½ minutes. Discard the
concrete.
DO NOT
use it in another test.
Figure S. Slump Test (Measurement)
BULLET POINTED
STEEL ROD
1/2 DIAMETER
24 INCHES LONG
1/3 FULL
FOOT
PIECE
APPENDIX — CONCRETE MIX INFORMATION
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