Appendix C-30HDNI C-30HDNI Slumptest Procedure

APPENDIX — C-30HDNI C-30HDNI 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 (Figure38-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- sultsunlessfollowed exactly.) Distributerodding evenlyover the entire cross section of the sample.

4.Fillconeanother1/3 (Figure38-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(Figure38-C).Rodthislayer25times with rod penetrating into but not through, the second layer. Distributeroddingevenlyovertheentirecrosssectionofthis layer.

6.Removetheexcessconcrete(Figure38-D)fromthetopofthe cone, using the tamping rod as a screed.

7.Lifttheconevertically(Figure38-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 ( Invert the withdrawn cone, and place it next to, but not touching the slumped concrete.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 38-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 41-B. Slump

Test (2/3 Full)

2/3 FULL

Figure 41-C. Slump Test

(Full-Overflow)

FULL (OVERFLOW)

Figure 41-D. SlumpTest

(Removing Excess Concrete)

Figure 41-E. SlumpTest

(Cone Invert)

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

Figure 41-A. SlumpTest (1/3 Full)

Figure 41-F. Slump Test

(Measurement)

PAGE 60 — MAYCO C-30HDG PUMP — OPERATION AND PARTS MANUAL — REV. #6 (04/02/12)

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