Appendix — concrete mix information, Slump test procedure – Multiquip LS-600P User Manual

Page 72

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page 72 — MaYCO LS600p CONCReTe pUMp • OpeRaTiON MaNUaL — Rev. #0 (05/13/13)

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)

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 Invert the withdrawn cone, and place it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)