ACI Concrete Field Testing Technician Grade I
(Latest 2023 – 2024) Complete Solution
The sensor of the temperature measuring device shall be submerged a minimum of _____ in.
[_____mm] into the freshly mixed concrete. - 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 _____. - 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 _____. - Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - True
The temperature of concrete may be measured in a wall form. True of False - True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - False
What must be done to the sample container prior to sampling the concrete? - Dampen
(with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - 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? -
At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] - 1 degree F
[0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? - 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? - False
The sample of concrete used for temperature determination must be rodded 25 times. True
or False? - False
, Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. - Compliance
This method covers sampling from four types of mixtures which are _____, _____, _____, and
_____. - 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. - 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the
sample. True of False? - 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. - 5
The molding of strength test specimens shall begin within _____ minutes after fabricating
the composite sample. - 15
The concrete sample must be protected from contamination and _____. - Rapid evaporation
The minimum size sample for making strength test specimens is _____. - 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 - 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. - 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. - 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? - False
The composite samples from a truck mixer must be obtained from the _____ portion of the
batch. - Middle
When the concrete contains aggregate larger than that permitted for a particular test
method, the sample of concrete must be _____ _____ before making the test. - Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of _____. - 1.5
in. [37.5 mm]
When the concrete contains aggregate larger than allowed for the slump test, the large
aggregate must be _____. - Removed by wet sieving the sample over 1.5 in. [37.5 mm] sieve
(Latest 2023 – 2024) Complete Solution
The sensor of the temperature measuring device shall be submerged a minimum of _____ in.
[_____mm] into the freshly mixed concrete. - 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 _____. - 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 _____. - Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - True
The temperature of concrete may be measured in a wall form. True of False - True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - False
What must be done to the sample container prior to sampling the concrete? - Dampen
(with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - 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? -
At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] - 1 degree F
[0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? - 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? - False
The sample of concrete used for temperature determination must be rodded 25 times. True
or False? - False
, Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. - Compliance
This method covers sampling from four types of mixtures which are _____, _____, _____, and
_____. - 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. - 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the
sample. True of False? - 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. - 5
The molding of strength test specimens shall begin within _____ minutes after fabricating
the composite sample. - 15
The concrete sample must be protected from contamination and _____. - Rapid evaporation
The minimum size sample for making strength test specimens is _____. - 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 - 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. - 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. - 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? - False
The composite samples from a truck mixer must be obtained from the _____ portion of the
batch. - Middle
When the concrete contains aggregate larger than that permitted for a particular test
method, the sample of concrete must be _____ _____ before making the test. - Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of _____. - 1.5
in. [37.5 mm]
When the concrete contains aggregate larger than allowed for the slump test, the large
aggregate must be _____. - Removed by wet sieving the sample over 1.5 in. [37.5 mm] sieve
