SLUMP TEST PROCEDURE (FIELD TESTING)

SLUMP TEST PROCEDURE  (FIELD TESTING)

1 To obtain a representative sample, take samples from two or more regular intervals throughout the discharge of the mixer or truck. DO NOT take samples at the begin-ning or the end of the discharge.

2 Dampen inside of 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 or, foot pieces throughout the test procedure to hold the cone firmly in place.

3                          Fill cone 1/3 full by volume and rod 25 times with 5/8-inch-

diameter x 24-inch-long hemispherical tip steel

 tamping rod. (This is a  specification requirement

which will produce non-

standard results unless followed exactly.) Distribute rodding evenly over the entire cross section of the sample.

4	Fill cone 2/3 full by volume. Rod
	this layer 25 times with rod
	penetrating into, but not
	through first layer. Distribute
	rodding evenly over the
	entire cross section of the
	layer.
7	Immediately lift
	cone vertically with
	slow, even motion. Do
	not jar the concrete or
	tilt the cone during
	this process. Invert the
	withdrawn cone, and
	place next to, but not

touching the slumped concrete. (Perform in 5-10 seconds with no lateral or torsional motion.)

5	Fill cone to overflowing. Rod this	6	Remove the excess con-
	layer 25 times with rod pen-		crete from the top of the
	etrating into but not through,		cone, using tamping rod as
	second layer. Distribute		a screed. Clean overflow
	rodding evenly over the entire		from base of cone.
	cross section of this layer.

8         Lay a straight edge across the top of

 the slump 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 shall

be completed in a maximum elapsed time of 2

1/2 minutes. Discard concrete. DO NOT use in

any other tests.