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. - Answers - 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
_____. - Answers - 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 _____. - Answers - Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
Answers - True
The temperature of concrete may be measured in a wall form. True of False - Answers -
True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - Answers - False
What must be done to the sample container prior to sampling the concrete? - Answers -
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - Answers - 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?
- Answers - At least 2 minutes but not more than 5 minutes
Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. - Answers - Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. - Answers - 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. - Answers - 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? - Answers - 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. - Answers - 5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. - Answers - 15
The concrete sample must be protected from contamination and _____. - Answers -
Rapid evaporation
The minimum size sample for making strength test specimens is _____. - Answers - 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 - Answers
-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. - Answers - 5
After the temperature of the concrete is read, what is required? - Answers - Reporting of
temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
Answers - 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
Answers - 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? - Answers - False
The sample of concrete used for temperature determination must be rodded 25 times.
True or False? - Answers - False
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. - Answers - 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? - Answers - False
The composite samples from a truck mixer must be obtained from the _____ portion of
the batch. - Answers - Middle
I
The sensor of the temperature measuring device shall be submerged a minimum of
_____ in. [_____mm] into the freshly mixed concrete. - Answers - 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
_____. - Answers - 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 _____. - Answers - Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
Answers - True
The temperature of concrete may be measured in a wall form. True of False - Answers -
True
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - Answers - False
What must be done to the sample container prior to sampling the concrete? - Answers -
Dampen (with water)
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete. - Answers - 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?
- Answers - At least 2 minutes but not more than 5 minutes
Sampling by this method is required when tests are to be made to determine _____ with
specification requirements. - Answers - Compliance
This method covers sampling from four types of mixtures which are _____, _____,
_____, and _____. - Answers - 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. - Answers - 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on
the sample. True of False? - Answers - 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. - Answers - 5
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite sample. - Answers - 15
The concrete sample must be protected from contamination and _____. - Answers -
Rapid evaporation
The minimum size sample for making strength test specimens is _____. - Answers - 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 - Answers
-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. - Answers - 5
After the temperature of the concrete is read, what is required? - Answers - Reporting of
temperature
The temperature of concrete is reported to the nearest _____ degrees F [_____ C] -
Answers - 1 degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete? -
Answers - 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? - Answers - False
The sample of concrete used for temperature determination must be rodded 25 times.
True or False? - Answers - False
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. - Answers - 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? - Answers - False
The composite samples from a truck mixer must be obtained from the _____ portion of
the batch. - Answers - Middle
