ACI-CONCRETE FIELD-TESTING TECHNICIAN GRADE 1|QUESTIONS AND VERIFIED
ANSWERS|NEW UPDATE 2026/2027|GRADED A+
The sensor of the temperature measuring device shall be submerged a minimum of _____ in.
[_____mm] into the freshly mixed concrete.
CORRECT|ANSWER
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 _____.
CORRECT|ANSWER
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 _____.
CORRECT|ANSWER
Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False?
CORRECT|ANSWER
True
The temperature of concrete may be measured in a wall form. True of False
CORRECT|ANSWER
True
,A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. True of False?
CORRECT|ANSWER
False
What must be done to the sample container prior to sampling the concrete?
CORRECT|ANSWER
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after the device is
submerged in the fresh concrete.
CORRECT|ANSWER
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?
CORRECT|ANSWER
At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required?
CORRECT|ANSWER
Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C]
CORRECT|ANSWER
1 degree F [0.5 C]
, According to ASTM C1064, what is one reason to take the temperature of concrete?
CORRECT|ANSWER
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?
CORRECT|ANSWER
False
The sample of concrete used for temperature determination must be rodded 25 times. True or False?
CORRECT|ANSWER
False
Sampling by this method is required when tests are to be made to determine _____ with specification
requirements.
CORRECT|ANSWER
Compliance
This method covers sampling from four types of mixtures which are _____, _____, _____, and _____.
CORRECT|ANSWER
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.
ANSWERS|NEW UPDATE 2026/2027|GRADED A+
The sensor of the temperature measuring device shall be submerged a minimum of _____ in.
[_____mm] into the freshly mixed concrete.
CORRECT|ANSWER
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 _____.
CORRECT|ANSWER
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 _____.
CORRECT|ANSWER
Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False?
CORRECT|ANSWER
True
The temperature of concrete may be measured in a wall form. True of False
CORRECT|ANSWER
True
,A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. True of False?
CORRECT|ANSWER
False
What must be done to the sample container prior to sampling the concrete?
CORRECT|ANSWER
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after the device is
submerged in the fresh concrete.
CORRECT|ANSWER
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?
CORRECT|ANSWER
At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required?
CORRECT|ANSWER
Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C]
CORRECT|ANSWER
1 degree F [0.5 C]
, According to ASTM C1064, what is one reason to take the temperature of concrete?
CORRECT|ANSWER
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?
CORRECT|ANSWER
False
The sample of concrete used for temperature determination must be rodded 25 times. True or False?
CORRECT|ANSWER
False
Sampling by this method is required when tests are to be made to determine _____ with specification
requirements.
CORRECT|ANSWER
Compliance
This method covers sampling from four types of mixtures which are _____, _____, _____, and _____.
CORRECT|ANSWER
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.
