ACI Concrete Field Testing Technician-
Grade I Test| Questions and 100% Correct
Answers| Latest Update
The mold for making the slump test is in the shape of _____. - ANSWER The frustum of a cone
The height of the slump mold is _____. - ANSWER 12 in. [300 mm]
The interior surface of the slump mold is allowed to have minor irregularities. True or False?
- ANSWER False
For use in the slump test, the end or both ends of the tamping rod must be _____. - ANSWER
Rounded to a hemispherical tip
The sample of concrete for use in making the slump test must be obained in accordance with
ASTM Standard _____. - ANSWER C172, Standard Practice for Sampling Freshly Mixed Concrete
The slump mold should be in a dry condition before beginning the test. True or False?
- ANSWER False
The surface on which the slump mold will be placed must be _____. - ANSWER Flat, level, moist,
nonabsorbent, and free of vibration
The slump mold is filled in _____ layers. - ANSWER 3
Each layer should fill approximately _____ the volume of the mold. - ANSWER One-third
,The approximate concrete depth (in verticle distance) after placing the first layer is _____, and
the second layer is _____. - ANSWER 2 5/8 in. [70 mm], 6 1/8 in. [160 mm]
What is the specified number of roddings for each layer? - ANSWER 25
How deep should the tamping rod penetrate into each layer? - ANSWER Rod each layer
throughout its depth; on the second and final layers, the rod should penetrate into the previous
layer approximately 1 in. [25 mm]
When rodding the bottom layer, the tamping rod must be _____ to uniformly distribute the
strokes. - ANSWER Slightly inclined
What must be done if the concrete drops below the top of the slump mold while the top layer
is being rodded? - ANSWER Add additional concrete to keep an excess of concrete above the
top of the mold at all times
Prior to lifting the mold, concrete must be removed from _____. - ANSWER The area
surrounding the base of the mold
After the final rodding, the sides of the slump mold should should be tapped lightly with
the tamping rod. True or False? - ANSWER False
When raising the slump mold, it should not be rotated or twisted, True or False? - ANSWER
True
How much time is allowed for lifting the slump mold? - ANSWER 5 +- 2 seconds
The measurement for slump is made from the top of the mold to what point of the concrete
specimen? - ANSWER The displaced original center of the top surface of the specimen
, The slump of the concrete is measured and reported to the nearest _____. - ANSWER 1/4 in. [5
mm]
How much time is allowed to conduct the slump test from beginning to completion? - ANSWER
2 1/2 minutes
The diameter of the tamping rod used in the test method is _____. - ANSWER 5/8 in. [16 mm]
What is the required shape of the tamping end of the rod? - ANSWER Rounded to a
hemispherical tip
What is the required minimum frequency of the vibrator used in this test method? -
ANSWER 7000 vibrations per minute
The outside diameter or side dimension of the vibrating element must be at least _____ but not
greater than _____. - ANSWER 0.75 in. [19 mm], 1.50 in. [38 mm]
A plastic container can be used for the measure in this method. True or False? - ANSWER False,
measure must be steel or another suitable metal
What is the minimum thickness of a metal strike-off plate? - ANSWER 1/4 in. [6 mm]
What is the minimum thickness for a glass or acrylic strike-off plate? - ANSWER 1/2 in. [12 mm]
What is the specified weight of the mallet used on measures that are 0.5 ft^3 [14 L] or smaller?
- ANSWER 1.25 +- 0.50 lb. [600 +- 200 g]
Measures other than air meter bowls used for this test must conform to ASTM _____. -
ANSWER C29
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