ACI Concrete Field Testing Technician- Grade I Exam Questions
and Answers
Question 1
Vibration of the concrete sample is not allowed when the slump of concrete exceeds _____.
Correct Answer
75 mm (3 in.)
Question 2
When rodding the bottom layer, the tamping rod must be _____ to uniformly distribute the strokes.
Correct Answer
Slightly inclined
Question 3
Specimens shall not be transported until _____ after final set.
Correct Answer
8h
Page 1 of 36
,Question 4
The height of the slump mold is _____.
Correct Answer
12 in. [300 mm]
Question 5
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]
Question 6
For concrete with a slump of less than 1 in. [25 mm], the test specimens must be consolidated by _____.
Correct Answer
Vibration
Question 7
What is the required shape of the tamping end of the rod?
Correct Answer
Rounded to a hemispherical tip
Page 2 of 36
,Question 8
If the concrete is to be consolidated by vibration, a standard 4 by 8 in. [100 mm by 200 mm] cylinder mold must be filled in
_____ equal layers.
Correct Answer
2
Question 9
What is the minimum thickness of a metal strike-off plate?
Correct Answer
1/4 in. [6 mm]
Question 10
What is the specified size of the mallet required for this test method when the measuring bowl has the capacity of 14 L [0.5
ft^3] or less?
Correct Answer
0.60 +- 0.25 kg [1.25 +- 0.50 lb.]
Question 11
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- _____
degrees F [+- _____ C] throughout a range of _____.
Correct Answer
1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
Page 3 of 36
, Question 12
Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job
site. True or False?
Correct Answer
False
Question 13
The temperature measuring device shall be calibrated _____, or whenever there is a question of _____.
Correct Answer
Annually, accuracy
Question 14
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]
Question 15
When large amounts of alcohol are used, the direct reading will tend to indicate a _____ air content.
Correct Answer
Higher
Page 4 of 36
and Answers
Question 1
Vibration of the concrete sample is not allowed when the slump of concrete exceeds _____.
Correct Answer
75 mm (3 in.)
Question 2
When rodding the bottom layer, the tamping rod must be _____ to uniformly distribute the strokes.
Correct Answer
Slightly inclined
Question 3
Specimens shall not be transported until _____ after final set.
Correct Answer
8h
Page 1 of 36
,Question 4
The height of the slump mold is _____.
Correct Answer
12 in. [300 mm]
Question 5
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]
Question 6
For concrete with a slump of less than 1 in. [25 mm], the test specimens must be consolidated by _____.
Correct Answer
Vibration
Question 7
What is the required shape of the tamping end of the rod?
Correct Answer
Rounded to a hemispherical tip
Page 2 of 36
,Question 8
If the concrete is to be consolidated by vibration, a standard 4 by 8 in. [100 mm by 200 mm] cylinder mold must be filled in
_____ equal layers.
Correct Answer
2
Question 9
What is the minimum thickness of a metal strike-off plate?
Correct Answer
1/4 in. [6 mm]
Question 10
What is the specified size of the mallet required for this test method when the measuring bowl has the capacity of 14 L [0.5
ft^3] or less?
Correct Answer
0.60 +- 0.25 kg [1.25 +- 0.50 lb.]
Question 11
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- _____
degrees F [+- _____ C] throughout a range of _____.
Correct Answer
1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
Page 3 of 36
, Question 12
Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job
site. True or False?
Correct Answer
False
Question 13
The temperature measuring device shall be calibrated _____, or whenever there is a question of _____.
Correct Answer
Annually, accuracy
Question 14
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]
Question 15
When large amounts of alcohol are used, the direct reading will tend to indicate a _____ air content.
Correct Answer
Higher
Page 4 of 36
