Aci Concrete Field Testing Technician-
Grade I Exam With Complete Solutions
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
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? - CORRECT ANSWER✔✔False
Grade I Exam With Complete Solutions
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
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? - CORRECT ANSWER✔✔False
