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PAGE 58 — MAYCO C-30HDNI (PRECISION) PUMP — OPERATION AND PARTS MANUAL — REV. #7 (04/03/12)
Figure 35-A. Slump Test (1/3 Full)
Figure 35-C. Slump Test
(Full-Overflow)
Figure 35-B. Slump
Test (2/3 Full)
Figure 35-D. Slump Test
(Removing Excess Concrete)
Figure 35-E. Slump Test
(Cone Invert)
Figure 35-F. Slump Test
(Measurement)
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,
nonabsorbent, 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
firmly in place.
3. Fill the cone 1/3 full by volume (Figure 35-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-standard re-
sults unless followed exactly.) Distribute rodding evenly over
the entire cross section of the sample.
4. Fill cone another 1/3 (Figure 35-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 35-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 35-D) from the top of the
cone, using the tamping rod as a screed.
7. Lift the cone vertically (Figure 35-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( Invert the withdrawn cone, and place it next to, but not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 35-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 maximum elapsed
time of 1-1/2 minutes. Discard the concrete. DO NOT use it in
any other tests.
APPENDIX — C-30HDNI C-30HDNI SLUMP TEST PROCEDURE
BULLET POINTED
STEEL ROD
1/2 DIAMETER
24 INCHES LONG
1/3 FULL
FOOT
PIECE
2/3 FULL
FULL
(OVERFLOW)