ACI CONCRETE FIELD-TESTING
TECHNICIAN GRADE I LATEST
QUESTIONS AND DETAILED CORRECT
ANSWERS (VERIFIED ANSWERS) | 100%
CORRECT SOLUTIONS 2025/2026
The approximate concrete depth (in verticle distance) after
placing the first layer is _____, and the second layer is
_____. Correct Answer 2 5/8 in. [70 mm], 6 1/8 in. [160
mm]
What is the specified number of roddings for each layer?
Correct Answer 25
How deep should the tamping rod penetrate into each
layer? Correct 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. Correct 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?
,Correct 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
_____. Correct 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? Correct Answer False
When raising the slump mold, it should not be rotated or
twisted, True or False? Correct Answer True
How much time is allowed for lifting the slump mold?
Correct Answer 5 +- 2 seconds
The measurement for slump is made from the top of the
mold to what point of the concrete specimen? Correct
Answer The displaced original center of the top surface of
the specimen
The slump of the concrete is measured and reported to
the nearest _____. Correct Answer 1/4 in. [5 mm]
How much time is allowed to conduct the slump test from
beginning to completion? Correct Answer 2 1/2 minutes
The diameter of the tamping rod used in the test method is
_____. Correct Answer 5/8 in. [16 mm]
,What is the required shape of the tamping end of the rod?
Correct Answer Rounded to a hemispherical tip
What is the required minimum frequency of the vibrator
used in this test method? Correct Answer 7000 vibrations
per minute
The outside diameter or side dimension of the vibrating
element must be at least _____ but not greater than
_____. Correct 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? Correct Answer False, measure
must be steel or another suitable metal
What is the minimum thickness of a metal strike-off plate?
Correct Answer 1/4 in. [6 mm]
What is the minimum thickness for a glass or acrylic strike-
off plate? Correct 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? Correct
Answer 1.25 +- 0.50 lb. [600 +- 200 g]
Measures other than air meter bowls used for this test
must conform to ASTM _____. Correct Answer C29
Air meter bowls used for this test must conform to ASTM
_____ and be calibrated for volumee according to ASTM
_____. Correct Answer C231, C29
, The concrete sample must be obtained in accodance with
what ASTM method? Correct Answer C172
What method of consolidation must be used when the
slump is greater than 3 in. [75 mm]? Correct Answer
Rodding
What method of consolidation must be used when the
slump is less than 1 in. (25 mm]? Correct Answer
Vibration
If rodding is the method of consolidation being used, the
measure must be filled in how many layers? Correct
Answer 3
For a measure of 0.5 ft^3 [14 L], what is the required
number of strokes of the tamping rod for consolidation of
each layer? Correct Answer 25
When rodding the middle and the top layers, the tamping
rod should penetrate into the layer below approximately
_____. Correct Answer 1 in. [25 mm]
If vibration is the method of consolidation, the measure
must be filled in _____ approximately equal layers.
Correct Answer 2
If, after consolidation of the final layer, the concrete level is
1/2 in. (13 mm) above the top of the measure, what should
TECHNICIAN GRADE I LATEST
QUESTIONS AND DETAILED CORRECT
ANSWERS (VERIFIED ANSWERS) | 100%
CORRECT SOLUTIONS 2025/2026
The approximate concrete depth (in verticle distance) after
placing the first layer is _____, and the second layer is
_____. Correct Answer 2 5/8 in. [70 mm], 6 1/8 in. [160
mm]
What is the specified number of roddings for each layer?
Correct Answer 25
How deep should the tamping rod penetrate into each
layer? Correct 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. Correct 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?
,Correct 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
_____. Correct 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? Correct Answer False
When raising the slump mold, it should not be rotated or
twisted, True or False? Correct Answer True
How much time is allowed for lifting the slump mold?
Correct Answer 5 +- 2 seconds
The measurement for slump is made from the top of the
mold to what point of the concrete specimen? Correct
Answer The displaced original center of the top surface of
the specimen
The slump of the concrete is measured and reported to
the nearest _____. Correct Answer 1/4 in. [5 mm]
How much time is allowed to conduct the slump test from
beginning to completion? Correct Answer 2 1/2 minutes
The diameter of the tamping rod used in the test method is
_____. Correct Answer 5/8 in. [16 mm]
,What is the required shape of the tamping end of the rod?
Correct Answer Rounded to a hemispherical tip
What is the required minimum frequency of the vibrator
used in this test method? Correct Answer 7000 vibrations
per minute
The outside diameter or side dimension of the vibrating
element must be at least _____ but not greater than
_____. Correct 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? Correct Answer False, measure
must be steel or another suitable metal
What is the minimum thickness of a metal strike-off plate?
Correct Answer 1/4 in. [6 mm]
What is the minimum thickness for a glass or acrylic strike-
off plate? Correct 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? Correct
Answer 1.25 +- 0.50 lb. [600 +- 200 g]
Measures other than air meter bowls used for this test
must conform to ASTM _____. Correct Answer C29
Air meter bowls used for this test must conform to ASTM
_____ and be calibrated for volumee according to ASTM
_____. Correct Answer C231, C29
, The concrete sample must be obtained in accodance with
what ASTM method? Correct Answer C172
What method of consolidation must be used when the
slump is greater than 3 in. [75 mm]? Correct Answer
Rodding
What method of consolidation must be used when the
slump is less than 1 in. (25 mm]? Correct Answer
Vibration
If rodding is the method of consolidation being used, the
measure must be filled in how many layers? Correct
Answer 3
For a measure of 0.5 ft^3 [14 L], what is the required
number of strokes of the tamping rod for consolidation of
each layer? Correct Answer 25
When rodding the middle and the top layers, the tamping
rod should penetrate into the layer below approximately
_____. Correct Answer 1 in. [25 mm]
If vibration is the method of consolidation, the measure
must be filled in _____ approximately equal layers.
Correct Answer 2
If, after consolidation of the final layer, the concrete level is
1/2 in. (13 mm) above the top of the measure, what should
