Multiquip LS-500 - Manual (Page 79)

MAYCO LS400/LS500 PUMP — OPERATION AND PARTS MANUAL — REV. #6 (09/19/11) — PAGE 79
Figure 68-A. Slump Test (1/3 Full)
Figure 68-C. Slump Test
(Full-Overflow)
Figure 68-B. Slump Test (2/3 Full)
Figure 68-D. Slump Test
(Removing Excess Concrete)
Figure 68-E. Slump Test
(Cone Invert)
Figure 68-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 68-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 results unless followed exactly.) Dis-
tribute rodding evenly over the entire cross section of
the sample.
APPENDIX — SLUMP TEST PROCEDURE
BULLET POINTED
STEEL ROD
1/2 DIAMETER
24 INCHES LONG
1/3 FULL
FOOT
PIECE
2/3 FULL
FULL
(OVERFLOW)
4. Fill cone another 1/3 (Figure 68-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
(Figure68-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.
7. Lift the cone vertically
(Figure 68-E) with a slow even
motion. DO NOT jar the con-
crete or tilt the cone during this
process. ( Invert the withdrawn
cone, and place it next to, but
not touching the slumped con-
crete.
6. Remove the excess concrete
(Figure 68-D) from the top of
the cone, using the tamping
rod as a screed.
8. Lay a straight edge (Figure 68-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 com-
plete in a maximum elapsed
time of 1-½ minutes. Discard
the concrete. DO NOT use it in
another tests.