Multiquip C30HDZ manual Appendix Slumptest Procedure

APPENDIX — SLUMPTEST 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.DONOTtake samples at the beginning or end of the discharge.

2.Dampentheinsideoftheconeandplaceitonasmooth,moist, nonabsorbent, level surface large enough to accommodate boththeslumpedconcreteandtheslumpcone.Standonthe “foot pieces” throughout the test procedure to hold the cone firmly in place.

3.Fillthecone1/3fullbyvolume (Figure34-A)androd25times with a 1/2” dia x 24” lg. bullet-pointed steel rod. (This is a specific requirement which will produce non-standard re- sultsunlessfollowedexactly.) Distributerodding evenlyover the entire cross section of the sample.

4.Fillconeanother1/3 (Figure34-B)whichwillmakethecone 2/3fullbyvolume.Rodthissecondlayer25timeswiththerod penetrating into, but not through, the first layer. Distribute rodding evenly over the entire cross section of the layer.

5.Fillconetooverflowing(Figure34-C).Rodthislayer25times with rod penetrating into but not through, the second layer. Distributeroddingevenlyovertheentirecrosssectionofthis layer.

6.Removetheexcessconcrete(Figure34-D)fromthetopofthe cone, using the tamping rod as a screed.

7.Lifttheconevertically(Figure34-E)withaslowevenmotion. 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 (Invert the withdrawn cone, and place it next to, but not touching the slumped concrete.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 34-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 timeof1-1/2minutes.Discardtheconcrete.DONOTuseitin any other tests.

BULLET POINTED

STEEL ROD

Figure 34-B. Slump

Test (2/3 Full)

2/3 FULL

Figure 34-C. SlumpTest

(Full-Overflow)

FULL (OVERFLOW)

Figure 34-D. SlumpTest

(Removing Excess Concrete)

Figure 34-E. SlumpTest

(Cone Invert)

	1/3 FULL
1/2 DIAMETER	FOOT
24 INCHES LONG
	PIECE

Figure 34-A. SlumpTest (1/3 Full)

Figure 34-F. SlumpTest

(Measurement)

PAGE 52 — MAYCO C30HDZ PUMP — OPERATION AND PARTS MANUAL — REV. #12 (04/03/12)