ACI Concrete Field Testing Technician- Grade I
Exam 2023/2024 Questions and with Correct
Answers.
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - 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
_____. - 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 _____. - ANSWER Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANSWER True
The temperature of concrete may be measured in a wall form. True of False -
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? - ANSWER False
What must be done to the sample container prior to sampling the concrete? -
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. - 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? - ANSWER At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - ANSWER
Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
ANSWER 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete?
- 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? - ANSWER False
The sample of concrete used for temperature determination must be rodded 25
times. True or False? - ANSWER False
Sampling by this method is required when tests are to be made to determine _____
with specification requirements. - ANSWER Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. - 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. - ANSWER 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? - ANSWER 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. - ANSWER 5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. - ANSWER 15
The concrete sample must be protected from contamination and _____. - ANSWER
Rapid evaporation
The minimum size sample for making strength test specimens is _____. - ANSWER
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 -
ANSWER 2
The composite sample for a paving mixer must represent a minimum of _____
different portions of the batch of concrete taken from the pile after discharge. -
ANSWER 5
When sampling from a revolving drum truck mixer, concrete must be sampled at a
minimum of _____ regularly spaced intervals during discharge of the middle portion
of this batch. - ANSWER 2
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? - ANSWER False
The composite samples from a truck mixer must be obtained from the _____ portion
of the batch. - ANSWER Middle
Exam 2023/2024 Questions and with Correct
Answers.
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - 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
_____. - 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 _____. - ANSWER Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
ANSWER True
The temperature of concrete may be measured in a wall form. True of False -
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? - ANSWER False
What must be done to the sample container prior to sampling the concrete? -
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. - 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? - ANSWER At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - ANSWER
Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
ANSWER 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete?
- 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? - ANSWER False
The sample of concrete used for temperature determination must be rodded 25
times. True or False? - ANSWER False
Sampling by this method is required when tests are to be made to determine _____
with specification requirements. - ANSWER Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. - 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. - ANSWER 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? - ANSWER 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. - ANSWER 5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. - ANSWER 15
The concrete sample must be protected from contamination and _____. - ANSWER
Rapid evaporation
The minimum size sample for making strength test specimens is _____. - ANSWER
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 -
ANSWER 2
The composite sample for a paving mixer must represent a minimum of _____
different portions of the batch of concrete taken from the pile after discharge. -
ANSWER 5
When sampling from a revolving drum truck mixer, concrete must be sampled at a
minimum of _____ regularly spaced intervals during discharge of the middle portion
of this batch. - ANSWER 2
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? - ANSWER False
The composite samples from a truck mixer must be obtained from the _____ portion
of the batch. - ANSWER Middle
