Multiquip C-30HD operation manual Slumptest Procedure

SLUMPTEST PROCEDURE

1.To obtain a representative sample, take 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 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.) Distribute rodding evenly over the entire cross section of the sample. (See figure A.)

4.Fill cone another 1/3 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. (See figure B.)

5.Fill cone to overflowing. 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. (See figure C.)

6.Remove the excess concrete from the top of the cone, using the tamping rod as a screed. (See figure D.)

7.Lift the cone vertically with a slow even motion. Do not jar the concrete or tilt the cone during this process. (See figure E.) Invert the withdrawn cone, and place it next to, but not touching the slumped concrete.

8.Lay a straight edge 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 (See Figure F).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.

C-30HD — PARTS & OPERATION MANUAL — REV. #4 (03/06/01) — PAGE 23