ACI Concrete Field Testing Technician-
Grade I Questions And Answers
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. -
(correct answer) -15
Portions of a composite sample shall be thoroughly
remixed bfore beginning tests on the sample. True of
False? - (correct 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. - (correct answer) -5
The molding of strength test specimens shall begin within
_____ minutes after fabricating the composite sample. -
(correct answer) -15
The concrete sample must be protected from
contamination and _____. - (correct answer) -Rapid
evaporation
The minimum size sample for making strength test
specimens is _____. - (correct 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 -
(correct 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. - (correct
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. - (correct answer) -2
Grade I Questions And Answers
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. -
(correct answer) -15
Portions of a composite sample shall be thoroughly
remixed bfore beginning tests on the sample. True of
False? - (correct 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. - (correct answer) -5
The molding of strength test specimens shall begin within
_____ minutes after fabricating the composite sample. -
(correct answer) -15
The concrete sample must be protected from
contamination and _____. - (correct answer) -Rapid
evaporation
The minimum size sample for making strength test
specimens is _____. - (correct 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 -
(correct 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. - (correct
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. - (correct answer) -2
