ACI Concrete Field-Testing Technician- Grade I
Latest Exam 2025 Verified Correct Answers.
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 be done? -
, CORRECT ANSWER>>Remove a representative portion of the excess concrete with a
trowel or scoop
After consolidation of the final layer, an excess of concrete ____ above the top of
the measure is considered optimum. - CORRECT ANSWER>>1/8 in. [3 mm]
After completing the strike-off procedure, what must be done before weighing
the measure and sample? - CORRECT ANSWER>>Clean off any excess concrete
The pressure method of determining air content can be used on concrete
containing _____ _____ aggregate. - CORRECT ANSWER>>Relatively Dense
The pressure method of determining air content cannot be used on
concrete containing the following types of aggregates, _____, _____,
_____. - CORRECT ANSWER>>Lightweight, air-cooled blast furnace slag, or
aggregates of high porosity
What is the minimum allowable capacity of the measuring bowl used in this
test method? - CORRECT ANSWER>>6 L (0.20 ft^3)
What are the required characteristics of the tamping rod used in this test method? -
CORRECT ANSWER>>Round, straight steel rod, with a 16 mm [5/8 in.] +- 2 mm [1/16
in.] diameter, length at least 100 mm [4 in.] greater than the depth of the
measuring bowl, but not greater than 600 mm [24 in.] in overall length, with the
tamping end rounded to a hemispherical tip of the same diameter as the rod.
Latest Exam 2025 Verified Correct Answers.
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 be done? -
, CORRECT ANSWER>>Remove a representative portion of the excess concrete with a
trowel or scoop
After consolidation of the final layer, an excess of concrete ____ above the top of
the measure is considered optimum. - CORRECT ANSWER>>1/8 in. [3 mm]
After completing the strike-off procedure, what must be done before weighing
the measure and sample? - CORRECT ANSWER>>Clean off any excess concrete
The pressure method of determining air content can be used on concrete
containing _____ _____ aggregate. - CORRECT ANSWER>>Relatively Dense
The pressure method of determining air content cannot be used on
concrete containing the following types of aggregates, _____, _____,
_____. - CORRECT ANSWER>>Lightweight, air-cooled blast furnace slag, or
aggregates of high porosity
What is the minimum allowable capacity of the measuring bowl used in this
test method? - CORRECT ANSWER>>6 L (0.20 ft^3)
What are the required characteristics of the tamping rod used in this test method? -
CORRECT ANSWER>>Round, straight steel rod, with a 16 mm [5/8 in.] +- 2 mm [1/16
in.] diameter, length at least 100 mm [4 in.] greater than the depth of the
measuring bowl, but not greater than 600 mm [24 in.] in overall length, with the
tamping end rounded to a hemispherical tip of the same diameter as the rod.
