ACI Concrete Field-Testing Technician-
Grade I Questions & Answers || GRADED
A+|| LATEST UPDATE 2026
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. -CORRECTANSWER 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
_____. -CORRECTANSWER 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 _____. -CORRECTANSWER Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
CORRECTANSWER True
The temperature of concrete may be measured in a wall form. True of False -
CORRECTANSWER True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? -CORRECTANSWER False
,What must be done to the sample container prior to sampling the concrete? -
CORRECTANSWER Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. -CORRECTANSWER 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?
-CORRECTANSWER At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? -CORRECTANSWER
Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
CORRECTANSWER 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
CORRECTANSWER 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? -CORRECTANSWER False
, The sample of concrete used for temperature determination must be rodded 25 times.
True or False? -CORRECTANSWER False
Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. -CORRECTANSWER Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. -CORRECTANSWER 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. -CORRECTANSWER 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? -CORRECTANSWER 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. -CORRECTANSWER 5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. -CORRECTANSWER 15
Grade I Questions & Answers || GRADED
A+|| LATEST UPDATE 2026
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. -CORRECTANSWER 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
_____. -CORRECTANSWER 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 _____. -CORRECTANSWER Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
CORRECTANSWER True
The temperature of concrete may be measured in a wall form. True of False -
CORRECTANSWER True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? -CORRECTANSWER False
,What must be done to the sample container prior to sampling the concrete? -
CORRECTANSWER Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. -CORRECTANSWER 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?
-CORRECTANSWER At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? -CORRECTANSWER
Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
CORRECTANSWER 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
CORRECTANSWER 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? -CORRECTANSWER False
, The sample of concrete used for temperature determination must be rodded 25 times.
True or False? -CORRECTANSWER False
Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. -CORRECTANSWER Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. -CORRECTANSWER 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. -CORRECTANSWER 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? -CORRECTANSWER 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. -CORRECTANSWER 5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. -CORRECTANSWER 15
