ACI CONCRETE FIELD-TESTING TECHNICIAN GRADE I
EXAM
QUESTIONS AND VERIFIED ANSWERS
The temperature of concrete may be measured in a wall form. True or False - ANSWER-True
The sensor of the temperature measuring device shall be submerged a minimum of _____ in. into
the freshly mixed concrete. - ANSWER-3 in.
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample.
True or False? - ANSWER-True
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, 30 degrees F to 120 F
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
A composite sample of concrete is required even if the only purpose for obtaining the sample is
to determine temperature. True or 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 - ANSWER-1 degree F
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 or False? -
ANSWER-False
, 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
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 sources of _____ and _____. - ANSWER-
contamination and rapid evaporation
The minimum size sample for making strength test specimens is _____. - ANSWER-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
When the concrete contains aggregate larger than that permitted for a particular test method, the
sample of concrete must be _____ _____ before making the test. - ANSWER-Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of _____. -
ANSWER-1.5 in.
When the concrete contains aggregate larger than allowed for the slump test, the large aggregate
must be _____. - ANSWER-Removed by wet sieving the sample over 1.5 in. sieve
The mold for making the slump test is in the shape of _____. - ANSWER-The frustum of a cone
The height of the slump mold is _____. - ANSWER-12 in. [300 mm]
EXAM
QUESTIONS AND VERIFIED ANSWERS
The temperature of concrete may be measured in a wall form. True or False - ANSWER-True
The sensor of the temperature measuring device shall be submerged a minimum of _____ in. into
the freshly mixed concrete. - ANSWER-3 in.
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample.
True or False? - ANSWER-True
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, 30 degrees F to 120 F
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
A composite sample of concrete is required even if the only purpose for obtaining the sample is
to determine temperature. True or 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 - ANSWER-1 degree F
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 or False? -
ANSWER-False
, 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
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 sources of _____ and _____. - ANSWER-
contamination and rapid evaporation
The minimum size sample for making strength test specimens is _____. - ANSWER-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
When the concrete contains aggregate larger than that permitted for a particular test method, the
sample of concrete must be _____ _____ before making the test. - ANSWER-Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of _____. -
ANSWER-1.5 in.
When the concrete contains aggregate larger than allowed for the slump test, the large aggregate
must be _____. - ANSWER-Removed by wet sieving the sample over 1.5 in. sieve
The mold for making the slump test is in the shape of _____. - ANSWER-The frustum of a cone
The height of the slump mold is _____. - ANSWER-12 in. [300 mm]
