1 | Page
ACI Concrete Field Testing
Technician- Grade I Questions and
Answers Latest 2026
The sensor of the temperature measuring device shall be
submerged a minimum of _____ in. [_____mm] into the
freshly mixed concrete. Ans: 3 in. [75 mm]
The temperature measuring device shall have a capacity
of measuring temperature of freshly mixed concrete to +-
_____ degrees F [+- _____ C] throughout a range of _____.
Ans: 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50
C]
The temperature measuring device shall be calibrated
_____, or whenever there is a question of _____. Ans:
Annually, accuracy
The temperature of concrete may be measured in a
wheelbarrow. True or False? Ans: True
The temperature of concrete may be measured in a wall
form. True of False Ans: True
A composite sample of concrete is required even if the
only purpose for obtaining the sample is to determine
temperature. True of False? Ans: False
What must be done to the sample container prior to
sampling the concrete? Ans: Dampen (with water)
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, 2 | Page
What must be done to the concrete surrounding the
temperature measuring device after the device is
submerged in the fresh concrete. Ans: Gently press the
concrete around the temperature measuring device at the
surface of the concrete
How long must the temperature measuring device remain
in the freshly mixed concrete? Ans: At least 2 minutes
but not more than 5 minutes
After the temperature of the concrete is read, what is
required? Ans: Reporting of temperature
The temperature of concrete is reported to the nearest
_____ degrees F [_____ C] Ans: 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the
temperature of concrete? Ans: Verify conformance to a
specified requirement for temperature of concrete
A maximum temperature of freshly mixed concrete is
specified in ASTM C1064. True of False? Ans: False
The sample of concrete used for temperature
determination must be rodded 25 times. True or False?
Ans: False
Sampling by this method is required when tests are to be
made to determine _____ with specification requirements.
Ans: Compliance
This method covers sampling from four types of
mixtures which are _____, _____, _____, and _____. Ans:
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, 3 | Page
Stationary mixers, paving mixers, revolving drum mixers,
and open top mixers
The maximum allowable time between obtaining the first
and final portions of a composite sample is _____
minutes. Ans: 15
Portions of a composite sample shall be thoroughly
remixed bfore beginning tests on the sample. True of
False? Ans: True
The maximum elapsed time allowed between obtaining
the final portion of the composite sample and beginning
the tests for slump, temperature, and air content is _____
minutes. Ans: 5
The molding of strength test specimens shall begin
within _____ minutes after fabricating the composite
sample. Ans: 15
The concrete sample must be protected from
contamination and _____. Ans: Rapid evaporation
The minimum size sample for making strength test
specimens is _____. Ans: 28 L (1ft^3)
When sampling from a stationary mixer, the batch must
be sampled at _____ or more regularly spaced intervals
during discharge of the middle portion of the batch Ans:
2
© 2025 All rights reserved
ACI Concrete Field Testing
Technician- Grade I Questions and
Answers Latest 2026
The sensor of the temperature measuring device shall be
submerged a minimum of _____ in. [_____mm] into the
freshly mixed concrete. Ans: 3 in. [75 mm]
The temperature measuring device shall have a capacity
of measuring temperature of freshly mixed concrete to +-
_____ degrees F [+- _____ C] throughout a range of _____.
Ans: 1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50
C]
The temperature measuring device shall be calibrated
_____, or whenever there is a question of _____. Ans:
Annually, accuracy
The temperature of concrete may be measured in a
wheelbarrow. True or False? Ans: True
The temperature of concrete may be measured in a wall
form. True of False Ans: True
A composite sample of concrete is required even if the
only purpose for obtaining the sample is to determine
temperature. True of False? Ans: False
What must be done to the sample container prior to
sampling the concrete? Ans: Dampen (with water)
© 2025 All rights reserved
, 2 | Page
What must be done to the concrete surrounding the
temperature measuring device after the device is
submerged in the fresh concrete. Ans: Gently press the
concrete around the temperature measuring device at the
surface of the concrete
How long must the temperature measuring device remain
in the freshly mixed concrete? Ans: At least 2 minutes
but not more than 5 minutes
After the temperature of the concrete is read, what is
required? Ans: Reporting of temperature
The temperature of concrete is reported to the nearest
_____ degrees F [_____ C] Ans: 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the
temperature of concrete? Ans: Verify conformance to a
specified requirement for temperature of concrete
A maximum temperature of freshly mixed concrete is
specified in ASTM C1064. True of False? Ans: False
The sample of concrete used for temperature
determination must be rodded 25 times. True or False?
Ans: False
Sampling by this method is required when tests are to be
made to determine _____ with specification requirements.
Ans: Compliance
This method covers sampling from four types of
mixtures which are _____, _____, _____, and _____. Ans:
© 2025 All rights reserved
, 3 | Page
Stationary mixers, paving mixers, revolving drum mixers,
and open top mixers
The maximum allowable time between obtaining the first
and final portions of a composite sample is _____
minutes. Ans: 15
Portions of a composite sample shall be thoroughly
remixed bfore beginning tests on the sample. True of
False? Ans: True
The maximum elapsed time allowed between obtaining
the final portion of the composite sample and beginning
the tests for slump, temperature, and air content is _____
minutes. Ans: 5
The molding of strength test specimens shall begin
within _____ minutes after fabricating the composite
sample. Ans: 15
The concrete sample must be protected from
contamination and _____. Ans: Rapid evaporation
The minimum size sample for making strength test
specimens is _____. Ans: 28 L (1ft^3)
When sampling from a stationary mixer, the batch must
be sampled at _____ or more regularly spaced intervals
during discharge of the middle portion of the batch Ans:
2
© 2025 All rights reserved
