ACI Concrete Field Testing Technician-
Grade I
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - Answer3 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
_____. -Answer1 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 _____. -AnswerAnnually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
AnswerTrue
The temperature of concrete may be measured in a wall form. True of False -
AnswerTrue
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - AnswerFalse
What must be done to the sample container prior to sampling the concrete? -
AnswerDampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - AnswerGently 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?
-AnswerAt least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - AnswerReporting of
temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
Answer1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
AnswerVerify conformance to a specified requirement for temperature of concrete
, A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of
False? -AnswerFalse
The sample of concrete used for temperature determination must be rodded 25 times.
True or False? -AnswerFalse
Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. -AnswerCompliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. -AnswerStationary 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. -Answer15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? -AnswerTrue
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. -Answer5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. -Answer15
The concrete sample must be protected from contamination and _____. -
AnswerRapid evaporation
The minimum size sample for making strength test specimens is _____. - Answer28 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 -
Answer2
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. - Answer5
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. -Answer2
Grade I
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - Answer3 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
_____. -Answer1 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 _____. -AnswerAnnually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
AnswerTrue
The temperature of concrete may be measured in a wall form. True of False -
AnswerTrue
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - AnswerFalse
What must be done to the sample container prior to sampling the concrete? -
AnswerDampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - AnswerGently 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?
-AnswerAt least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - AnswerReporting of
temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
Answer1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
AnswerVerify conformance to a specified requirement for temperature of concrete
, A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of
False? -AnswerFalse
The sample of concrete used for temperature determination must be rodded 25 times.
True or False? -AnswerFalse
Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. -AnswerCompliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. -AnswerStationary 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. -Answer15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? -AnswerTrue
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. -Answer5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. -Answer15
The concrete sample must be protected from contamination and _____. -
AnswerRapid evaporation
The minimum size sample for making strength test specimens is _____. - Answer28 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 -
Answer2
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. - Answer5
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. -Answer2
