ACI Concrete Field Testing Technician-
Grade I exam questions and 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
Grade I exam questions and 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
