ACI Concrete Field Testing Technician Exam
2026| Grade I Exam | All Questions and
Correct Answers (Updated Version) | Graded
A+ | Just Released
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
2026| Grade I Exam | All Questions and
Correct Answers (Updated Version) | Graded
A+ | Just Released
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
