Multiquip LS600P operation manual Slump Test Procedure

appendix — concrete mix information

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.

BULLET POINTED

STEEL ROD

1/3 FULL

1/2 DIAMETER

24 INCHES LONGFOOT PIECE

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.

2/3 FULL

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

1/3 FULL

1/2 DIAMETER

24 INCHES LONGFOOT PIECE

Figure P. Slump Test (Full-Overflow)

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 Invert the withdrawn cone, and place it next to, but not touching the slumped concrete.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)

page 72 — MAYCO LS600P CONCRETE PUMP • operation manual — rev. #0 (05/13/13)